Reference Manual neu - RS Components · The MICROMASTER 420 (6SE64) is designed to replace the MM3...

0,&520$67(5

5HIHUHQFH0DQXDO ,VVXH$

8VHU'RFXPHQWDWLRQ

MICROMASTER 420 Reference Manualii Issue A1

0,&520$67(5'2&80(17$7,21

*HWWLQJ6WDUWHG*XLGH

2SHUDWLQJ,QVWUXFWLRQV

5HIHUHQFH0DQXDO

&DWDORJXHV

MICROMASTER 420 Reference ManualIssue A1 iii

Valid for A1 Release

Inverter Type Control Version

MICROMASTER 420 MM4

,VVXH$

0,&520$67(5

5HIHUHQFH0DQXDO8VHU'RFXPHQWDWLRQ

,QWURGXFWLRQ

(QJLQHHULQJ,QIRUPDWLRQ

&RPPXQLFDWLRQV

2SWLRQV

7URXEOH6KRRWLQJ

0DLQWHQDQFH

$SSHQGLFHV $

,QGH[

MICROMASTER 420 Reference Manualiv Issue A1

Further information is available on the Internet under:

http://www.siemens.de/micromaster

Approved Siemens Quality for Software and Trainingis to DIN ISO 9001, Reg. No. 2160-01

The reproduction, transmission or use of this document, or itscontents is not permitted unless authorized in writing.Offenders will be liable for damages. All rights including rightscreated by patent grant or registration of a utility model ordesign are reserved.

© Siemens AG 2000. All Rights Reserved.

MICROMASTER® is a registered trademark of Siemens.

Other functions not described in this document may beavailable. However, this fact shall not constitute an obligationto supply such functions with a new control, or whenservicing.

We have checked that the contents of this documentcorrespond to the hardware and software described. Theremay be discrepancies nevertheless, and no guarantee can begiven that they are completely identical. The informationcontained in this document is reviewed regularly and anynecessary changes will be included in the next edition. Wewelcome suggestions for improvement.

Siemens handbooks are printed on chlorine-free paper thathas been produced from managed sustainable forests. Nosolvents have been used in the printing or binding process.

Document subject to change without prior notice.

Printed in the United Kingdom Siemens-Aktiengesellschaft.

,QWHUQDWLRQDO(QJOLVK &RQWHQWV

MICROMASTER 420 Reference ManualIssue A1 v

7DEOHRI&RQWHQWV

,QWURGXFWLRQ

1.1 Purpose of this Manual..............................................................................................2

1.2 Compatibilty ...............................................................................................................2

(QJLQHHULQJ,QIRUPDWLRQ

2.1 Current Limit and Overload Operation ......................................................................8

2.2 Fast Current Limit ......................................................................................................9

2.3 Positive Temperature Coefficient Resistor Use.......................................................10

2.4 I2t Performance........................................................................................................10

2.5 Internal Overtemperature ........................................................................................10

2.6 Overvoltage and Trip Levels....................................................................................11

2.7 Boost........................................................................................................................11

2.8 Proportional and Integral Control (PI)......................................................................12

2.9 Braking.....................................................................................................................20

2.10 Derating Factors ......................................................................................................22

2.11 Cubicle Calculations ................................................................................................26

2.12 Thermal Protection and Automatic De-rating ..........................................................26

2.13 Operation from Unearthed Supplies ........................................................................27

2.14 Multi-Motor Connection ...........................................................................................27

2.15 Control Modes (P1300) ...........................................................................................27

2.16 Working with Binary Connectors (BiCo) ..................................................................28

2.17 Acoustic Noise .........................................................................................................35

2.18 Harmonic Currents ..................................................................................................36

2.19 Power Losses ..........................................................................................................38

&RQWHQWV ,QWHUQDWLRQDO(QJOLVK

MICROMASTER 420 Reference Manualvi Issue A1

&RPPXQLFDWLRQV

3.1 Using the Serial Interface ........................................................................................41

3.2 Working with Serial Communications......................................................................41

3.3 Using the Universal Serial Interface Protocol..........................................................43

3.4 PROFIBUS ..............................................................................................................60

3.5 PROFIBUS Module .................................................................................................61

2SWLRQV

4.1 Introduction ..............................................................................................................66

4.2 Variant Dependent Options .....................................................................................66

4.3 Variant Independent Options...................................................................................73

7URXEOHVKRRWLQJ

5.1 Troubleshooting with Status Display Panel .............................................................76

5.2 MICROMASTER 420 Fault Codes ..........................................................................76

0DLQWHQDQFH

6.1 Maintenance ............................................................................................................78

$ $SSOLFDEOH6WDQGDUGV

,QWHUQDWLRQDO(QJOLVK &RQWHQWV

MICROMASTER 420 Reference ManualIssue A1 vii

/LVWRI)LJXUHV

Figure 2-1 Current Limit Interaction .........................................................................................................8

Figure 2-2 PTC Resistor Connections ..................................................................................................10

Figure 2-3 Boost Level...........................................................................................................................11

Figure 2-4 Quick response with overshoot: P2280 = 0.30; P2285 = 0.03 s ..........................................14

Figure 2-5 Quick response with overshoot, but instability: P2280 = 0.55; P2285 = 0.03 s ....................15

Figure 2-6 Damped response: P2280 = 0.20; P2285 = 0.15 s...............................................................15

Figure 2-7 Response to 5 Hz step: L = 100 ms .....................................................................................16

Figure 2-8 Response to 5 Hz step: T = 700 ms .....................................................................................17

Figure 2-9 Step Response in PI control with P2280 = 9.84 and P2285 = 0.30 ......................................17

Figure 2-10 PI Basic Block Diagram ........................................................................................................19

Figure 2-11 Frequency Ramp Down........................................................................................................20

Figure 2-12 DC Braking ...........................................................................................................................20

Figure 2-13 Compound Braking...............................................................................................................21

Figure 2-14 Derating with Temperature ...................................................................................................22

Figure 2-15 Derating with Altitude............................................................................................................24

Figure 2-16 Power Losses .......................................................................................................................38

Figure 3-1 Typical RS485 Multidrop Interface........................................................................................42

Figure 3-2 Telegram Structure...............................................................................................................43

Figure 3-3 Address (ADR) Bit Numbers.................................................................................................44

Figure 3-4 Useful Data Characters ........................................................................................................44

Figure 4-1 Inverter with Filter. ................................................................................................................66

Figure 4-2 Inverter with Input Choke......................................................................................................67

Figure 4-3 Inverter with Output Choke...................................................................................................68

Figure 6-1 Fan Removal ........................................................................................................................78

&RQWHQWV ,QWHUQDWLRQDO(QJOLVK

MICROMASTER 420 Reference Manualviii Issue A1

/LVWRI7DEOHV

Table 2-1 Current Limit and Overload.....................................................................................................8

Table 2-2 Measured Current Monitoring Accuracy .................................................................................9

Table 2-3 Trip Levels ............................................................................................................................11

Table 2-4 Maximum Cable Lengths......................................................................................................23

Table 2-5 Derating with Switching Frequencies....................................................................................25

Table 2-6 Cubicle Calculations .............................................................................................................26

Table 2-7 BiCo Connections (r0019 to r0054) ......................................................................................31



Table 2-10 BiCo connections (r2053 to r2294) .......................................................................................34

Table 2-11 Acoustic Test Results ...........................................................................................................35

Table 2-12 Single Phase 230V Connection............................................................................................36

Table 2-13 Three Phase 230V Connection.............................................................................................36


Table 3-1 Defined Task ID....................................................................................................................47

Table 3-2 Defined Reply ID ..................................................................................................................47

Table 3-3 Defined Error Values for Reply ID = Task cannot be executed ............................................48

Table 3-4 PZD Area Structure ..............................................................................................................51

Table 3-5 Inverter Control Word (STW)................................................................................................52

Table 3-6 Inverter Status Word (PZD) ..................................................................................................53

Table 3-7 Practical Examples ...............................................................................................................54

Table 3-8 Comparison Table (MICROMASTER 420/Earlier MICROMASTER) ....................................58

Table 3-9 Assignment of the PROFIBUS SUB-D socket connector .....................................................63

Table 3-10 Maximum Cable Lengths for Data Transfer Rates................................................................63

Table 3-11 Order Numbers for Connectors and Cables .........................................................................63

Table 3-12 Technical data ......................................................................................................................64

Table 3-13 PROFIBUS Ordering information..........................................................................................64

Table 4-1 Recommended Fuses (230 V Single-phase) ........................................................................69

Table 4-2 Recommended Fuses (230 V Three-phase) ........................................................................69

Table 4-3 Recommended Fuses (380 V – 480 V) ................................................................................70

Table 4-4 Recommended Circuit Breakers (230 V Single-phase) ........................................................71

Table 4-5 Recommended Circuit Breakers (230 V Three-phase).........................................................71

Table 4-6 Recommended Circuit Breakers 380 V – 480 V) ..................................................................72

Table 5-1 Inverter conditions indicated by the LEDs on the SDP .........................................................76

,QWHUQDWLRQDO(QJOLVK ,1752'8&7,21

MICROMASTER 420 Reference ManualIssue A1 1

1 Introduction

This Chapter contains an introduction to the contents of the manual with a briefdescription of each chapter.

&RQWHQWV

1.1 Purpose of this Manual..............................................................................................2

1.2 Compatibilty ...............................................................................................................2

,1752'8&7,21 ,QWHUQDWLRQDO(QJOLVK

MICROMASTER 420 Reference Manual2 Issue A1

1.1 Purpose of this Manual

The purpose of this manual is to familiarize the user with the benefits andproperties of the MICROMASTER 420 and to expand on information found inrelated documentation.

Chapter 2 contains engineering information designed to assist the user in operatingthe inverter in the most efficient way and provides detailed information on deratingfactors and protection characteristics.

The MICROMASTER 420 has extensive communications and control capabilities.Chapter 3 explains the various methods and communications protocols, givingworking examples to aid understanding.

Several options and accessories are available for use with the inverter. Chapter 4contains a brief explanation of each option with references to more detailedinformation.

Chapter 5 provides troubleshooting advice and fault code particulars.

Service information and an illustration showing fan removal are contained inChapter 6.

Appendix A gives a brief description of the standards referenced in the design andproduction of the MICROMASTER 420 and you can obtain more information fromthe documentation products listed in Appendix B.

An index is provided at the back of this manual.

1.2 Compatibilty

If you have experience of the MM3, the following notes will help you get to knowthe MICROMASTER 420.

The MICROMASTER 420 (6SE64) is designed to replace the MM3 6SE92 andoffers many new features and functions.

1. The MICROMASTER 420 is footprint compatible, and uses the same mountingpositions. Frame Size A is about 8mm deeper than MM3 FSA.. In some cases, thefan housing is deeper, but you should ensure that the surrounding area is free.

2. The terminal marking and numbering are the same with the terminals mounted atthe front of the unit for easier connection. An analogue output and RS485 areprovided via new terminals 12, 13, 14 and 15.

3. The MICROMASTER 420 is supplied with a Status Display Panel (SDP).Parameters cannot be changed unless a Basic Operator Panel (BOP) or anAdvanced Operator Panel (AOP) is fitted. The MICROMASTER 420 is, therefore,supplied with the parameters set for simple control using Digital and Analogueinputs:

a. Digital input 1 (terminal 5) – Run Right / Stop (OFF1).

b. Digital input 2 (terminal 6) – Reverse.

c. Digital input 3 (terminal 7) – Fault reset.

d. Analogue input 0 to 10 V = 0 to 50 Hz (Frequency Setpoint).

e. Analogue Output 0 to 20 mA = 0 to 50 Hz output frequency.

f. Relay output: (Fault) Relay de-energized when inverter fault active.

,QWHUQDWLRQDO(QJOLVK ,1752'8&7,21


4. A Dual In-line Package (DIP) switch is used to select North American Defaults.DIP switch 2 located under the SDP selects North American defaults when set to‘on’ (up). Next switch ‘on’ will set 60 Hz etc. P0100, settings 0 and 1 will beoverwritten by DIP switch 2.

1RWHDo not change DIP switch 1 from ‘off’.

5. The BOP has an additional button to MM3, a function button (Fn). This has severalfunctions:

a. If a fault occurs and the drive trips, pressing the Fn button will reset thefault.

b. After reading or accessing a parameter (e.g. P1210), pressing the Fnbutton will return the display to r0000, saving scrolling time.

c. If the output frequency is displayed and Fn pressed for approximately onesecond, the DC link voltage is displayed. Short presses toggle thoughoutput current, output voltage, output frequency. A long press returns tooriginal display.

d. When changing parameter values, pressing the Fn button and using thearrows will allow individual digits to be accessed for easy setting of leastsignificant digits.

6. The parameter structure is completely different. Parameters are logically grouped;e.g. P0700 to P0799 are control I/O functions.

a. Parameter access levels are controlled by parameter P0003; e.g. Level 2gives access to a similar number of parameters as MM3.

b. Parameter P0004 allows access to parameter groups; e.g. P0004 = 3allows motor data parameters to be accessed and changed.

c. Setting parameter P0010 = 1 enters a ‘quick commissioning’ mode whichenables key parameters to be set and motor data automatically calculated.(See the Getting Started Guide for detailed information on ‘QuickCommissioning’).

1RWHWith P0010 = 1, the drive will not run.

d. Some parameters (P0100, Motor parameters etc.) can only be changedwhen P0010 =1.

e. Setting Parameter P0010 = 30 and then P0970 = 1 resets factoryparameters to default (except North American defaults).

f. Parameter P0100 = 0 or 1 allows the DIP switch (see above ) to be read.

g. Parameter P1910 and P3900 calculate the motor parameters, like P088 onMM3. This is important on MICROMASTER 420 and is part of the quickcommissioning. If the Binary Connectors (BiCo) settings of the digitalinputs are enabled by setting P0701, 2 or 3 to 99, the only way to clearthem is to reset all parameters using P0970. (BiCo details are contained inChapter 2, Engineering Information)

7. There are important differences in the implementation of the USS protocol. It willbe necessary to change the control messages used to control theMICROMASTER 420. (See Chapter 3, Communications).

,1752'8&7,21 ,QWHUQDWLRQDO(QJOLVK


,QWHUQDWLRQDO(QJOLVK (1*,1((5,1*,1)250$7,21


2 Engineering Information

This chapter contains Information to assist the user in using theMICROMASTER 420 in the most efficient way.

Topics include connection details, derating factors and methods of protecting themotor and inverter.

Examples are given to illustrate the use of the parameter list.

&RQWHQWV

2.1 Current Limit and Overload Operation ......................................................................8

2.1.1 Current Monitoring Accuracy .....................................................................................9

2.2 Fast Current Limit ......................................................................................................9

2.3 Positive Temperature Coefficient Resistor Use.......................................................10

2.4 I2t Performance........................................................................................................10

2.5 Internal Overtemperature ........................................................................................10

2.6 Overvoltage and Trip Levels....................................................................................11

2.7 Boost........................................................................................................................11

2.8 Proportional and Integral Control (PI)......................................................................12

2.8.1 What is Closed Loop control?..................................................................................12

2.8.2 Implementation on MICROMASTER 420................................................................12

2.8.3 Setting up the PI controller ......................................................................................12

2.8.4 PI Setpoint ramp times ............................................................................................14

2.8.5 PI Controller Proportional and Integral terms..........................................................14

2.8.6 Ziegler-Nichols method of Optimisation ..................................................................16

2.8.7 PI output limits .........................................................................................................18

2.8.8 Further features .......................................................................................................18

2.9 Braking.....................................................................................................................20

2.9.1 Normal Braking........................................................................................................20

2.9.2 DC Braking ..............................................................................................................20

2.9.3 Vdc Max Controller ..................................................................................................21

2.9.4 Compound Braking..................................................................................................21

2.10 Derating Factors ......................................................................................................22

2.10.1 Derating with Temperature ......................................................................................22

2.10.2 Operation with Long Cables ....................................................................................22

2.10.3 Derating with Altitude...............................................................................................24

2.10.4 Derating with Switching Frequency .........................................................................24

2.10.5 Derating for Sideways Installation ...........................................................................25

(1*,1((5,1*,1)250$7,21 ,QWHUQDWLRQDO(QJOLVK


2.10.6 Derating with Single-Phase Input ............................................................................25

2.11 Cubicle Calculations ................................................................................................26

2.12 Thermal Protection and Automatic De-rating ..........................................................26

2.13 Operation from Unearthed Supplies ........................................................................27

2.14 Multi-Motor Connection ...........................................................................................27

2.15 Control Modes (P1300) ...........................................................................................27

2.15.1 Linear V/f Control.....................................................................................................27

2.15.2 Flux Current Control (FCC) .....................................................................................27

2.15.3 Quadratic V/f Control ...............................................................................................27

2.15.4 Multi-point V/f Control ..............................................................................................27

2.16 Working with Binary Connectors (BiCo) ..................................................................28

2.16.1 Introduction ..............................................................................................................28

2.16.2 How does BiCo work? .............................................................................................28

2.16.3 Using Control and Status Words with BiCo.............................................................30

2.16.4 BiCo Connections....................................................................................................31

2.17 Acoustic Noise .........................................................................................................35

2.18 Harmonic Currents ..................................................................................................36

2.19 Power Losses ..........................................................................................................38



)LJXUHV

Figure 2-1 Current Limit Interaction .........................................................................................................8

Figure 2-2 PTC Resistor Connections ..................................................................................................10

Figure 2-3 Boost Level...........................................................................................................................11

Figure 2-4 Quick response with overshoot: P2280 = 0.30; P2285 = 0.03 s ..........................................14

Figure 2-5 Quick response with overshoot, but instability: P2280 = 0.55; P2285 = 0.03 s ....................15

Figure 2-6 Damped response: P2280 = 0.20; P2285 = 0.15 s...............................................................15

Figure 2-7 Response to 5 Hz step: L = 100 ms .....................................................................................16

Figure 2-8 Response to 5 Hz step: T = 700 ms .....................................................................................17

Figure 2-9 Step Response in PI control with P2280 = 9.84 and P2285 = 0.30 ......................................17

Figure 2-10 PI Basic Block Diagram ........................................................................................................19

Figure 2-11 Frequency Ramp Down........................................................................................................20

Figure 2-12 DC Braking ...........................................................................................................................20

Figure 2-13 Compound Braking...............................................................................................................21

Figure 2-14 Derating with Temperature ...................................................................................................22

Figure 2-15 Derating with Altitude............................................................................................................24

Figure 2-16 Power Losses .......................................................................................................................38

7DEOHV

Table 2-1 Current Limit and Overload.....................................................................................................8

Table 2-2 Measured Current Monitoring Accuracy .................................................................................9

Table 2-3 Trip Levels ............................................................................................................................11

Table 2-4 Maximum Cable Lengths......................................................................................................23

Table 2-5 Derating with Switching Frequencies....................................................................................25

Table 2-6 Cubicle Calculations .............................................................................................................26




Table 2-10 BiCo connections (r2053 to r2294) .......................................................................................34

Table 2-11 Acoustic Test Results ...........................................................................................................35

Table 2-12 Single Phase 230V Connection............................................................................................36





2.1 Current Limit and Overload Operation

The inverter will always protect itself, the motor and the system from possibledamage. Where a short circuit exists on the output of the inverter, the unit will tripalmost instantaneously to protect itself. In the event of short and/or long termoverload conditions, current limit facilities now operate very rapidly to reduce thecurrent and prevent a trip occurring. Table 2-1 describes the facilities available.

Table 2-1 Current Limit and Overload

(OHFWURQLF7ULS This is a very fast current limit, which operates ifthere is a short circuit (line to line or line to earth) onthe output. It is a fixed level trip and operates withina few microseconds.

2YHUORDG/LPLW This is a very fast limit, which operates within a fewmicroseconds and removes some of the outputpulses to limit the current and protect the inverter. Ifthis pulse dropping occurs during overload, theoperating condition will usually recover and themotor will continue to run without tripping.

/RQJ7HUP2YHUORDG/LPLW This is a slower limit which allows an overload of atleast 60 seconds where the current lies above themotor limit but below the Electronic Trip andOverload Limit.

&RQWLQXRXV/LPLW This is the level set as the maximum continuousmotor current. The inverter will control the current tothis level after other overloads have timed out.

Figure 2-1 illustrates the interaction of the parameters associated with current limit.The Read Only parameters r0027, r0034, r0037 and r0067 will help with faultdiagnosis.

25 680

0RWRU,W&DOFXODWRU33

&XUUHQW/LPLW6HWWLQJ3

,QYHUWHU,W&DOFXODWRU3

,QYHUWHU+HDWVLQN7HPSHUDWXUH

0RWRU0RGHO3;;

,W3URJUHVVU

$FWXDO,QYHUWHU7HPSHUDWXUHU

0RGLILHG&XUUHQW/LPLW9DOXHU

0HDVXUHG&XUUHQW

5HVXOWLQJ&XUUHQW

,PD[

&RQWUROOHU337HUP3,7HUP

5HDFWLRQWR,W3

,QYHUWHU7HPSHUDWXUH3

$FWLRQ5HGXFH)UHTXHQF\5HGXFH9ROWDJH

5HGXFH3XOVH)UHTXHQF\5DLVH:DUQLQJ

7ULS

)DXOWV:DUQLQJV$&XUUHQW/LPLW$),QYHUWHU2YHUWHPSHUDWXUH$),QYHUWHU,W$,QYHUWHU'XW\&\FOH$)0RWRU,W

Figure 2-1 Current Limit Interaction



2.1.1 Current Monitoring Accuracy

The current display accuracy is typically +/- 2% of the measured current, but couldvary up to +/- 5%. Table 2-2 shows the sample results comparing the currentmeasured with a current scope, and the current displayed on the inverter, usingmeasurements taken from a variety of inverters at various switching frequencies,current loads, frequency setpoints and cable lengths.

Table 2-2 Measured Current Monitoring Accuracy

Inverter FSA 230 V750 W

FSB 230 V2.2 kW

FSC 230 V5.5 kW

Switching frequency 8 kHz 16 kHz 2 kHz

Load on inverter min. load 1.5 A max. load 12 A max. load 25 A

Frequency setpoint 45 Hz 25 Hz 10 Hz

Scope current (long cable) 1.5 A 12 A 23.0 A

Drive current (long cable) 1.6 A 11.9 A 23.3 A

% difference (inverter/scope) -2.3% 0.8% -1.2%

Scope current (short cable) 1.5 A 12 A 25 A

Drive current (short cable) 1.5 A 11.9 A 25.5 A

% difference (inverter/scope) 0.0% 0.8% -2.0%

2.2 Fast Current Limit

Fast Current Limit (FCL) is a cycle by cycle hardware current limit built into theinverter. The current is rapidly reduced by pulse dropping, that is by turning off theInsulated Gate Bipolar Transistors (IGBTs) on a pulse by pulse (cycle by cycle)basis. The normal current limit operation then takes over.

The FCL threshold is set slightly below the software overcurrent trip threshold andreacts much quicker (i.e. in milliseconds), thus preventing spurious and unwantedtrips when sudden loads are applied or fast accelerations requested.

FCL is especially useful when working in open loop control to override unwantedcurrents.



2.3 Positive Temperature Coefficient Resistor Use

Many motors are available with a Positive Temperature Coefficient (PTC) resistorbuilt into the windings. The resistance of the resistor rises rapidly at a particulartemperature and this change can be detected by the inverter. If the resistor isconnected to the inverter terminals as shown in Figure 2-2, and the PTC inputenabled by setting parameter P087=001, then if the resistance rises above 2 kΩ,the inverter will trip and Fault Code F004 displayed.

Most Motor Protection PTC resistors have a resistance of 2-300 ohms when coldand this value rises rapidly at the ‘knee point’ to typically 10 kΩ and greater. ThePTC input is set so that it will operate at 1 kΩ minimum, 1.5 kΩ nominal, and 2 kΩmaximum. The input has considerable filtering because the PTC connectionusually carries considerable Electro Magnetic Interference (EMI). On this basis twoor three PTCs may be connected in series when a motor has more than one PTCbuilt in, or if two or three motors are connected to the inverter output and requireindividual protection.

Inverter Control Terminals

Motor PTC 1 KΩ

8 5, 6 or 7 9

Figure 2-2 PTC Resistor Connections

2.4 I2t Performance

When the motor is running at low speed and high load, the built-in cooling fan maynot provide enough cooling and the motor may overheat. Parameter P074 allows afrequency dependent I2t limit to be enabled to protect the motor.

When the inverter is operating in the region above the selected curve (i.e. at lowfrequency and high current), a timer is started, and after some time, (based on thecurrent, the motor size and previous operating history), the inverter will trip orreduce output frequency. Trip or reduction of output frequency will depend on theparameter setting.

2.5 Internal Overtemperature

Under normal circumstances, the inverter will not overheat. A heatsink and fancombine to maintain the inverter at normal operating temperature. Carefulconsideration when mounting the inverter will ensure adequate ventilation andreduce the likelihood of overheating. Check to see whether other units may restrictairflow.

The heatsink temperature is monitored using a PTC resistor and the inverter willtrip if the maximum temperature is exceeded. If the inverter persistently trips, youshould check for high ambient temperature, a faulty fan, or blocked airflow.

You can verify the heatsink temperature by displaying Parameter r0037. Units aregiven in degrees Celsius (oC). Removing a faulty fan is described in Chapter 6,Maintenance.



2.6 Overvoltage and Trip Levels

The inverter will protect itself from both supply overvoltage and undervoltage. Triplevels are shown in Table 2-3. Internal overvoltage can occur during brakingwhere internal voltages are forced high by energy from an external load.

Table 2-3 Trip Levels

,QSXW6XSSOLHV

8QGHUYROWDJHWULSOHYHOV

2YHUYROWDJHWULSOHYHOV

1/3 Phase 230 V 205 V 410 V

3 Phase 400 V 410 V 820 V

When output pulses are disabled from the inverter an undervoltage trip will notoccur. An overvoltage trip will occur at any time when the overvoltage threshold isexceeded.

&DXWLRQ

Check to ensure you have matched the input supply to the inverter. If the supplyvoltage is too high, you may damage the inverter even if it trips.

2.7 Boost

Boost is used to increase the output voltage in order to overcome losses and non-linearity at low frequencies. If the correct amount of boost is applied, the currentand torque will be increased at low frequencies. However, if too much boost isapplied, the motor may overheat if run at low frequencies for a long time andexcessive boost may also saturate the motor, leading to loss of torque.

The I2t function helps protect the motor under these circumstances. Boost iscalculated such that 100% boost is the voltage given by:

Stator resistance (P0350) multiplied by rated motor current (P0305).

Which means that changing the value of these parameters will affect the boostlevel.

Voltage

Frequency

Boost Increasesvoltage here

Figure 2-3 Boost Level



3 This parameter sets the% boost applied at 0 Hz. The boost level is thenreduced with increasing frequency to a minimum value, set by P1316,typically around about 10 Hz.

3 This parameter sets a boost voltage, as P1310, except that the boost isapplied only during acceleration, either following a start command or fromset point changes.

3 This parameter allows a constant linear boost, again as P1310, to beapplied following a start command only to improve ‘first time’ starting.

The maximum values of P1310, 1311,and 1312 are 250%, but the overallmaximum boost is limited by P0640, the motor overload setting. The boost voltagewill also be limited by the operation of the I2t function, so boost may be reducedfurther if the motor is in danger of overheating. The progress of the I2t function canbe monitored by parameter r0034.

The default settings (P1310 = 50, P1311 and P1312 = 0) allow satisfactoryoperation with most loads. Increasing the boost up to say 200% (note that P0640setting will limit) on smaller motors and 100% on larger motors will often giveimproved torque at low frequencies. Use P1311 and P1312 to limit this toaccelerating boost only (e.g. P1310 = 100, P1312 = 100), to reduce the possibilityof overheating.

2.8 Proportional and Integral Control (PI)

2.8.1 What is Closed Loop control?

Closed loop control is widely used in industrial applications to control a wide varietyof processes. Control engineering is a complex subject, but a simple closed loopcontrol uses a feedback signal from the process (such as temperature, pressure,speed) a desired value or setpoint (often set manually) and a control system thatcompares the two and derives an error signal. The error signal is then processedand used to control the inverter and motor (in this case) to try to reduce the error.

The error signal processing can be very complex because of delays in the system.The error signal is usually processed using a Proportional and Integral (PI)controller whose parameters can be adjusted to optimize the performance andstability of the system. Once a system is set up and stable, very efficient andaccurate control can be achieved. See Figure 2-10. Page 19.

2.8.2 Implementation on MICROMASTER 420

The MICROMASTER 420 has a built in PI controller that can be enabled by theuser to allow closed loop control. Once the PI controller is enabled (using P2200),the PI controller internally generates the motor frequency necessary to minimizethe error between the PI setpoint and the PI feedback. It does this by continuouslycomparing the feedback signal with the setpoint and uses the PI controller todetermine the necessary motor frequency. The normal frequency setpoint (P1000setting) and ramp times (P1120 & P1121) are automatically disabled but theminimum and maximum output frequency settings (P1080 and P1082) remainactive.

2.8.3 Setting up the PI controller

$FFHVVLQJ3,SDUDPHWHUV

The PI parameters are in the range between P2200 and P2294. For mostapplications, the level 2 parameters are sufficient for setting up the PI controller.



To access only the PI controller parameters, you can use the parameter filter asfollows:P0003 = 2P0004 = 22

(QDEOLQJ3,FRQWURO

PI control is enabled using parameter P2200. For constant enabling of the PIcontroller this should be set to 1. It is also possible to use a digital input (or otherBiCo functions) to enable the PI controller, e.g. the PI controller can be enabledusing DIN 2 by setting P0702 = 99 and P2200 = 722.1. This allows the user toswitch between frequency control and PI control when the inverter is not running.

3,)HHGEDFNVLJQDO

PI control requires a feedback signal from the process to monitor how the systemis behaving. For the majority of applications, this will be in the form of an analoguesensor.

The MICROMASTER 420 has one analogue input, terminal connections 3 & 4, andthe feedback signal can be connected to this input. The source of the PI feedbacksignal must then be defined using P2264 = 755 (source of PI feedback = analogueinput 1). If required the analogue input can be scaled using parameters P0757 –P0760. If a different source of feedback signal is used (e.g. USS), P2264 must beset appropriately. The value of the feedback signal can be viewed via parameterr2266.

The relation between the sensor signal and the manner in which the PI controllerchanges the motor frequency must also be defined at this point. This is done usingP2271 (PI transducer type). There are 2 possible settings for this parameter, 0 and1. The difference between these settings is whether the PI controller increases ordecreases output frequency as a response to a positive error signal (i.e. where thefeedback signal is less than the setpoint). The parameter description for P2271describes in detail how to determine which setting is correct for your application.

3,VHWSRLQW

The PI controller controls the inverter frequency by comparing the actual systembehaviour (via the feedback signal) with the desired system behaviour. Thedesired behaviour is defined using a setpoint. The user selects the source of thesetpoint with parameter P2253. The MICROMASTER 420 only has one analogueinput and this is most commonly used for the feedback signal, so an internal digitalsetpoint is usually used. There are two methods of doing this, either using the“fixed PI setpoint ” or the “keypad (motorized potentiometer) setpoint”.

1. P2253 = 2224Fixed PI setpoint

This method allows the user to define up to 7 setpointvalues using parameters P2201 to P2207 and selectbetween these using binary signals, usually via the digitalinputs. The different selection methods are described inthe parameter list under P2201.

2. P2253 = 2250Keypad(motorisedpotentiometer)setpoint.

This method allows the user to set a fixed value inP2240. The setpoint can be increased or decreasedeither with the arrow keys on the BOP or more commonlyvia digital inputs (e.g. P0702 = 13 “increase” and P0703= 14 ”decrease”).

1RWHValues are given in % rather than Hz, and the running frequency of the inverter isdetermined by the difference between the setpoint and feedback signals and theaction of the PI controller.



2.8.4 PI Setpoint ramp times

When PI control is enabled using P2200, the normal frequency ramp up and rampdown times (P1120 and P1121) are bypassed. The PI setpoint has its own ramptimes, P2257 and P2258, which allow ramped PI setpoint changes.

The ramp up time, P2257, is active when the PI setpoint is changed or when aRUN command is given. The ramp down time, P2258 is only effective on PIsetpoint changes. The ramp down times used after OFF1 and OFF3 commandsare set in P1121 and P1135 respectively.

2.8.5 PI Controller Proportional and Integral terms

The user can tune the performance of the PI controller to suit his process demandsby adjusting the P and I terms, P2280 and P2285. The demands of the processwill determine the optimal type of response, from a rapid recovery response withovershoot to a damped response. By adjusting the P and I parameters it ispossible to achieve different types of response.

([DPSOH

The following figures show how different responses to a 5% PI setpoint stepchange on a pressure control system. The traces show the PI feedback signal,with 1 V = 10%. The different responses are achieved by varying the settings ofP2280 and P2285.

Figure 2-4 Quick response with overshoot: P2280 = 0.30; P2285 = 0.03 s



Figure 2-5 Quick response with overshoot, but instability:P2280 = 0.55; P2285 = 0.03 s

Figure 2-6 Damped response: P2280 = 0.20; P2285 = 0.15 s

The values of P2280 and P2285 will be determined by the relationship betweenmotor frequency and the PI control quantity (e.g. pressure).

When optimizing a control process we would recommend using an oscilloscope tomonitor the feedback signal to see the system response. The analogue output canbe used for this by setting P0771 = 2266. Most commonly small PI setpoint stepchanges (1- 10%) without the PI ramp times (P2257 = P2258 = 0.0 s) are used toevaluate the system response. Once the desired response profile has beenachieved, the operational ramp times are then set.

If you are optimizing without an oscilloscope we suggest starting with a small Pterm (e.g. P2280 = 0.20) and adjusting the I term until stable operation constantachieved. A small PI setpoint change should then be given and depending on thesystem response the parameters adjusted according to the tendencies shown inthe figures above.



In general, the most stable control is achieved by using both proportional andintegral terms, and if the system is liable to experience sudden disturbances wewould not recommend setting the P term (P2280) greater than 0.50.

A block diagram showing the relationships and interaction between PI Setpoint andPI Feedback is shown in Figure 2-10 on Page 19.

2.8.6 Ziegler-Nichols method of Optimisation

The Ziegler-Nichols method is a means of calculating the3roportional gain and,ntegral time by measuring the system response to a step change in open loop.This is done by putting the inverter in frequency control and monitoring thefeedback signal. From the feedback response, the time before the system starts torespond, /, and the dominant time constant, 7, which is measured by estimatingwhen the system response would have reached its stationary value if the maximumslope was maintained. (Typically measure to where the system response hasreached 85% of its final value). From L, T and the ratio between the frequencystep ∆I(as % of Fmax) to the feedback value change ∆[(%), it is possible tocalculate the P and I terms for a PI control process as follows:

3JDLQ 7∆I/∆[,WLPH /([DPSOH

With the inverter in frequency control, a frequency step of 5 Hz is given and thefeedback signal monitored. To allow this the following parameters are set:

P2200 = 0P1120 = 0.0 sP1121 = 0.0 sP1080 = 50.0 Hz.

Figure 2-7 Response to 5 Hz step: L = 100 ms



Figure 2-8 Response to 5 Hz step: T = 700 ms

The frequency step ∆I = 5 Hz / 50 Hz = 10%The feedback step ∆[= 0.64 V / 10 V = 6.4%

3gain (0.9)(T)(∆f) / (L)(∆x) = 9.84 = 3, time 3L = 0.30 s = 3

The PI controller should now be enabled (P2200 = 1).

Figure 2-9 Step Response in PI control with P2280 = 9.84 and P2285 = 0.30



2.8.7 PI output limits

The PI controller generates the frequency at which the inverter runs. This isgenerated as a % which is normalized into Hz via P2000. The user can limit theoutput range of the controller using parameters P2291 and P2292. While theinverter will only operate within the frequency range defined by Fmin (P1080) andFmax (P1082), the PI output limits can be used to further limit the output frequency.Once one of the limits has been reached, a bit is set P0053.A or P0053.B whichcan be connected to the digital output via P0731, or used for internal controlpurposes using BiCo.

1RWHIf Fmax (P1082) is greater than the value in P2000, then either P2000 or P2291should be adjusted to allow Fmax to be reached.

Setting P2292 to a negative value allows bipolar operation of the PI controller.

2.8.8 Further features

Further features, such as a PI setpoint trim can be accessed in user access level 3(P0003 = 3). These features are described in the Parameter List.



Setpointr2260

KK

7ULP6RXUFH

P2254

KK

Setpoint Source

P2253

6HWSRLQW)LOWHU7LPH&RQVWDQW

3

7ULP*DLQ3

+

36HWSRLQW*DLQ

+

Accel time forSetpointP2257

Decel time forSetpointP2258

+

-

)LOWHUHG6HWSRLQWU

KK

Feedback SourceP2264

FilteredFeedback

r2266

7UDQVGXFHU)XQFWLRQ

3

Feedback Filter Time Constant

P2265

3)HHGEDFN*DLQ

[

\0D[LPXPIHHGEDFNWKUHVKROG

3

0LQLPXPIHHGEDFNWKUHVKROG

3

Scaled Feedbackr2272

x

y

r2294

PI in upper limit/lower limitP53.10/P53.11

Kp Tn

P GainP2280

I GainP2285

Transducer TypeP2271

Errorr2273

3$FFHO'HFHOWLPHRI3,OLPLWV

3,2XWSXW8SSHU/LPLW3

3,2XWSXW/RZHU/LPLW3

3,6HWSRLQW

3,)HHGEDFN

3,2XWSXW

/HJHQG

/HYHO3DUDPHWHUV2QO\

The source is user definedusing BiCo connectors

,WDOLFV =

=

Figure 2-10 PI Basic Block Diagram



2.9 Braking

Reducing the output frequency of the inverter will cause the motor to slow downand as the frequency is gradually reduced to zero the motor will stop. Reducingthe output frequency too rapidly may cause the motor to act as a generator andcause a negative current (regeneration) to return to the DC link. To overcome thispossibility the MICROMASTER 420 employs a number of methods to controlbraking. These options are described in the following paragraphs.

The method of bringing the motor to a standstill is selected by the user dependingon operational requirements.

2.9.1 Normal Braking

The usual or normal braking method is to allow the motor to come to a standstill atthe selected ramp-down rate (OFF1), to coast to a standstill (OFF2) or to quicklyramp down (OFF3) without applying any additional braking. (Refer to parametersP0701, P0702 and P0703). However, if regeneration does cause tripping, DC orCompound braking methods may be considered.

Figure 2-11 Frequency Ramp Down

2.9.2 DC Braking

In this method a controlled DC voltage is applied to the rotor. When using DCbraking, the inverter output pulses are disabled and the actual time taken to bringthe motor to a standstill cannot be predicted. Stored energy in the motor and theload is dissipated in the rotor therefore no regeneration occurs.

The DC braking current is defined as a percentage of nominal motor current usingparameter P1236. The current will be applied only when the motor is sufficientlydemagnetized. If the demagnetization time for the motor (P0347), is reduced toomuch then the drive will trip on over current (F0001) when DC braking is activated.DC braking can be enabled by an external source such as a digital input.

Figure 2-12 DC Braking

1RWHFrequent use of DC braking can cause the motor to overheat.



2.9.3 Vdc Max Controller

The MICROMASTER 420 has a controller to limit the DC voltage ( Vdc Maxcontroller). When braking a load faster than would normally be possible, excessenergy has to be dissipated. This energy is unable to go back into the input supplyso the result is that the DC link voltage rises. If this voltage rises too high, the triplevel will be reached and the output pulses disabled to prevent damage to theinverter. The Vdc Max controller automatically increases the frequency andextends the ramp down period so that the braking is not as fast, thus reducing therisk of an overvoltage trip and keeping the system running. This means that thesystem will ramp down on the voltage limit until a standstill or a new setpoint isreached. (Refer to parameter P1240 for configuration details).

2.9.4 Compound Braking

When Compound braking is used, the energy is dissipated in the motor instead ofcoming back into the DC link. This has the advantage that the brakingperformance of the inverter can be increased, without tripping the inverter andwithout the use of a braking resistor.

Compound braking combines the braking power of DC braking with the controloffered by a ramp down. When using Compound braking, the ramp-down time isdefined and the level of current to be used in Compound braking is defined usingP1236.

Figure 2-13 Compound Braking



2.10 Derating Factors

2.10.1 Derating with Temperature

Losses within the power module rise with increasing switching frequencies, leadingto higher heatsink temperatures. Operation of the inverter outside itsrecommended ambient operating temperature would normally cause the inverter totrip with an overtemperature fault code. To avoid such tripping, the inverterautomatically reduces its switching frequency ( e.g. from 16kHz to 8kHz), thusreducing the temperature of the heatsink, enabling the application to continuerunning trip free. Should the load or ambient temperature then reduce, the inverterwill first check to see if it is safe to increase the switching frequency again and ifconsidered safe will then do so. See also paragraph 2.11 Cubicle Calculations, onPage 26.

80

60

40

0

20

rate

d ou

tput

cur

rent

100

-10 0 7010 20 30 40 50 60

Degrees Celsius

Figure 2-14 Derating with Temperature

2.10.2 Operation with Long Cables

All cables have stray capacitance between conductors, and between conductorsand Earth. Current will flow in this capacitance depending on the voltage andfrequency of the signal in the cables.

The output of all PWM (Pulse Width Modulated) inverters includes fast switchingedges with very high rates of change of voltage which have a significant highfrequency component.

The total current in the stray cable capacitance is determined by the voltage leveland the switching speed, as well as the stray capacitance value.

The value of stray capacitance itself is dependent of the cable length, the type ofcable, how and where it is laid, and whether it is contained in a screen or armour(which would normally be connected to earth).

If the resultant capacitance value and frequency content is high, peak currents mayflow in the stray cable capacitance resulting in excessive heating in the inverter, oreven in instantaneous trip values being reached, causing the inverter to shut down.

Extensive testing and experience indicates that measurements with screened, andwith loosely bundled unscreened cables give results which are valid for mostpractical applications. Input cable length has no influence.

All MICROMASTER 420 inverters are fully tested and characterized for worst caseoperation (50 0C, Full load current etc. default switching frequency) when used with



50 m of unscreened cable or 100 m of screened or armoured cable. Note that ifEMC filters are fitted (internally or externally) the relevant standards are met withup to 25 m of unscreened cable, and 50 m of screened, subject to careful layout.

Table 2-4 shows that, in certain cases, longer cable lengths are permissible,subject to the notes below.

1RWHV

• The table applies to inverters operated at or below their maximum ratedcurrent. Operation in excess of this (e.g. overload) may result in prematureshutdown due to overheating or overcurrent.

• The table is valid for the default switching frequency of the inverter. (Usually16 kHz or 4 kHz). Selecting a lower frequency will reduce the dissipation inthe inverter, but does not reduce the peak current values so the permissiblecable length is largely unaffected.

• The applicable cable length may be increased by a further 25% if an outputinductor (choke) is fitted. See below.

• Where long cable lengths are permitted, or where output chokes are fitted,care must be taken to ensure that the maximum voltage drop (including thedrop in the choke, if fitted) does not exceed 5%.

• Low voltage units (230 V) are tested at 264 V, 50 0C, Full load current, Highvoltage units (400 V) at 440 V 50 0C, Full load current.

Table 2-4 Maximum Cable Lengths

,QYHUWHU 6FUHHQHG&DEOH/HQJWKPHWUHV

8QVFUHHQHG&DEOH/HQJWKPHWUHV

120 W – 750 W 200 V – 240 V 100 150

370 W – 1.5 kW 380 V – 480 V 75 100

1.1 W – 2.2 kW 200 V – 240 V 75 100

2.2 W – 4 kW 380 V – 480 V 150 200

3.0 W – 5.5 kW 200 V – 240 V 150 200

5.5 W – 11 kW 380 V – 480 V 150 200



2.10.3 Derating with Altitude

Figure 2-15 shows the permissible rated input voltage and output current forinverter installations from 500 m to 4000 m above sea level.

Permissible rated input voltageas a percentage of thenominal voltage

100

90

80

60

70

1000 2000 3000 4000500 500

Installation altitude in metres above sea level

Permissible rated output currentas a percentage of thenominal current

100

90

80

60

70

1000 2000 3000 4000

Inpu

t vol

tage

Rat

ed o

utpu

t cur

rent

77

Figure 2-15 Derating with Altitude

2.10.4 Derating with Switching Frequency

The default switching frequency of the MICROMASTER 420 is 16 kHz for lowvoltage units (230 V)and 4 kHz for high voltage units (400 V). This is usuallyadequate for most applications and will allow full performance to be obtained fromall products over the full temperature range.

Select the switching frequency using P1800. High voltage units are automaticallyderated by reducing the continuous output current if switching frequencies above4 kHz are selected. Deratings are shown at P1800 in the System Parameter list.

The switching frequency will be automatically reduced if the internal temperature ofthe inverter becomes too high (see r0037, inverter temperature). This reduceslosses and allows continued operation. This feature is controlled by P0290.

Under extreme conditions of overload, the switching frequency may momentarilyreduce to protect the inverter.

The derating applies to constant torque and variable torque settings. Table 2-5 onPage 25 shows the value to which the maximum outputs are reduced.



Table 2-5 Derating with Switching Frequencies

0HDVXUHG2XWSXW&XUUHQW3RZHUN:

N+] N+] N+] N+] N+] N+] N+]

0.37 1.2 1.2 1.2 1.2 1.2 1.2 1.1

0.55 1.6 1.6 1.6 1.6 1.6 1.6 1.1

0.75 2.1 2.1 2.1 2.1 1.6 1.6 1.1

1.10 3.0 3.0 2.7 2.7 1.6 1.6 1.1

1.50 4.0 4.0 2.7 2.7 1.6 1.6 1.1

2.20 5.9 5.9 5.1 5.1 3.6 3.6 2.6

3.00 7.7 7.7 5.1 5.1 3.6 3.6 2.6

4.00 10.2 10.2 6.7 6.7 4.8 4.8 3.6

5.50 13.2 13.2 13.2 13.2 9.6 9.6 7.5

7.50 18.4 18.4 13.2 13.2 9.6 9.6 7.5

11.00 26.0 26.0 17.9 17.9 13.5 13.5 10.4

2.10.5 Derating for Sideways Installation

Mounting the inverter sideways is not recommended.

2.10.6 Derating with Single-Phase Input

The following information applies to 4 kW and 5.5 kW 230 V unfiltered invertersonly.

4 kW to be derated to 3 kW.5.5 kW to be derated to 3.66 kW.

In output current terms this means 13.6 A for the 4 kW inverter and 16.5 A for the5.5 kW inverter.



2.11 Cubicle Calculations

The MICROMASTER 420 will operate in a temperature of 50 °C without de-rating.

Ensure that the inlet and outlet ducts are not blocked, for example by cables.Check also that the positioning of units inside the cubicle do not obstruct naturalventilation.

It is very important to ensure that the maximum operating temperatures are notexceeded inside a cubicle. When installing an inverter in a cabinet, it is necessaryto calculate the heat rise. Refer to Table 2-6 for the steps in calculating this rise.

Table 2-6 Cubicle Calculations

6WHS 0HWKRG

1. Calculate total heat loss (Ploss) for all units inside the cabinet.

Use manufacturers’ data. (See paragraph 2.19 on Page 38)

2. For a sealed cabinet, calculate temperature rise using the formula:Trise = Ploss/(5.5 x A)

Where A is the total exposed area of the cabinet in square metres.

3. For a fan cooled cabinet: calculate temperature rise using the formula:Trise = (0.053 x Ploss)/F

Where F is the air flow in cubic metres /minute.

Add the Temperature rise to the external ambient temperature. If this is greaterthan the operating temperature of the inverter, additional cooling will be needed, orthe units must be de-rated.

It will also be necessary to de-rate at altitudes above 1000m. (See Figure 2-15 onPage 24)

2.12 Thermal Protection and Automatic De-rating

The MICROMASTER 420 has comprehensive hardware and software thermalprotection.

+DUGZDUH Fitted to the heatsink is a PTC resistor that will cause the inverter totrip if the temperature reaches 110 °C.

6RIWZDUH When the heatsink reaches within 15 °C of this trip level, the switchingfrequency, and output frequency of the inverter will both be reduced to reduce thelosses and current in the inverter in an attempt to prevent overtemperature trip.

It is possible to prevent this reduction and select an immediate trip if desired. Seeparameters P0290, P0292 for further details.

The inverter is further protected by an Inverter I2t calculation that determines howhot the Insulated Gate Bipolar Transistors (IGBTs) are and will reduce the currentlimit (P0640) when this calculation reaches 95%. (User defined in P0294). If the I2tcontinues to rise to 100% an Inverter I2t trip will occur (F0005).

Overtemperature in the inverter is usually caused by a high ambient temperature, afaulty or blocked fan, or blocked air inlet or outlet. Refer to Chapter 6,Maintenance Information, for details of fan exchange.



2.13 Operation from Unearthed Supplies

The MICROMASTER 420 can be used on unearthed input supplies. In order to dothis it is necessary to remove the Y Caps (See Appendix D in the OperatingInstructions), and also to fit an output choke. (See Chapter 4, Options or choosethe Options category on the CD-ROM supplied with the inverter.) If a faultcondition occurs on the input of the inverter, the inverter will continue to functionand if there is an earth fault on one output phase, the inverter will continue tooperate. If there are two or more earth faults on the inverter output, the inverter willtrip on overcurrent F0001.

It is recommended that an external earth fault detection device be used to warn theuser when a fault condition has occurred so that the condition can be rectifiedbefore it happens again. This will allow an uninterrupted operation.

&DXWLRQ

Connection of a 400 V 3-phase supply to a single phase or 3-phase 230 Vinverter will destroy the inverter.

2.14 Multi-Motor Connection

Will follow with next version of Reference Manual.

2.15 Control Modes (P1300)

Expand this section with graphics and method.

The various modes of operation of the MICROMASTER 420 control therelationship between the speed of the motor and the voltage supplied by theinverter. There are four modes of operation:

2.15.1 Linear V/f Control

Can be used for variable and constant torque applications, such as conveyors andpumps.

2.15.2 Flux Current Control (FCC)

This control mode can be used to improve the efficiency and dynamic response ofthe motor.

2.15.3 Quadratic V/f Control

This mode can be used for variable torque loads, such as fans and pumps.

2.15.4 Multi-point V/f Control

Expert mode only.



2.16 Working with Binary Connectors (BiCo)

2.16.1 Introduction

To make use of BiCo you will need access to the full parameter list. At this levelmany new parameter settings are possible, including BiCo functionality. BiCofunctionality is a different, more flexible way of setting and combining input andoutput functions. It can be used in most cases in conjunction with the simple, level2 settings.

2.16.2 How does BiCo work?

The BiCo system used on more complex drives such as Masterdrives, allowscomplex functions to be programmed. Boolean and mathematical relationshipscan be set up between inputs (digital, analogue, serial etc.) and outputs (invertercurrent, frequency, analogue output, relays etc.).

The MICROMASTER 420 uses a simplified version of BiCo, which is still veryflexible, is contained within the parameter set and can be set up without usingadditional software or hardware.

([DPSOH

Use BiCo parameterization to enable the output relay using Digital Input 2.

6WHS $FWLRQ

1 Set P0003 to 3 to access all parameters.

2 Set P0702 to 99 to enable BiCo parameterization on Digital Input 2.1RWHIf P0701, 2, 3, or 4 are set to 99, it is not possible to change them to anothervalue; the inverter must be reset to factory defaults.

3 Because Digital input 2 is ‘open’ to BiCo settings, a new value 722.1 now appearsin P0731.

The value 722.1 means ‘connect to digital input 2’(722.0 = input 1, 722.2 = input 3 etc.).

Set P0731 to 722.1

4 Run the inverter using input 1 and operate the relay using input 2.

1RWHBiCo is a ‘reverse’ connection. That is, the output function is connected back tothe input so it is not possible to tell from P0702 (99) what the digital input iscontrolling. However, there are many diagnostic parameters that can assist insetting up BiCo functions. (See following examples).

([DPSOH

Set P0771 to 37; this connects the analogue output to the inverter temperatureparameter, r0037, so the temperature of the inverter can be monitored remotely.



([DPSOH

Using OFF3 instead of OFF1.

Set P0701 = 99 to enable BiCo function.Set P0840 = 722.0 (On right via digital input 1).Set P0848 = 722.0 (OFF3 via digital input 1).

Now the inverter will ramp between set points using the normal ramp time as set inP1120 and 1121. However, at switch off from digital input 1, the inverter will turnoff with an OFF3, using the ramp rate set in P1135, which may be different toP1121.

An additional advantage is that the OFF3 function usually requires a second digitalinput; here the BiCo function permits digital input 1 to perform a run right and anOFF3.

([DPSOH

Selecting an alternative ramp time when a certain fixed frequency is selected.

Three fixed frequencies are selected using three digital inputs.The digital inputs also select ‘on right’.The third digital input also selects the alternative (Jog) ramp times.

1RWHThis will only enable an alternative ramp up time, because, when digital input 3 isswitched low it will also de-select the alternative ramp time. Normal ramp downtime will therefore be used.

6WHS 'HILQLWLRQ $FWLRQ 5HVXOW

1 Use fixed frequencies. P1000 = 3

2 Enable BiCofunctionality.

P0701 = 99P0702 = 99P0703 = 99

3 Define source of FixedFrequencies.

P1020 = 722.1P1021 = 722.2P1022 = 722.3

Defines the source of each fixedfrequency as digital input 1, 2, and 3.

4 Define mode ofoperation.

P1016 = 2P1017 = 2P1018 = 2

Sets the mode of operation of fixedfrequencies to “select fixedfrequency and on right command”.

5 Select Jog ramp timesinstead of normal ramptimes.

P1124 = 722.2 Enables digital input 3.

1RWH

Steps 3 and 4 use BiCo functions to set digital input 1 and 2. This function canalso be set using normal parameterization in Level 2.



2.16.3 Using Control and Status Words with BiCo

Many MICROMASTER 420 read only parameters consist of control words. Theparameter is made up of a 16 bit number, each bit representing a particular value.For example, parameter P0052 (Status Word 1) gives various value settings suchas Inverter ready (bit 0), or Motor Current Limit (bit b).

This parameter is displayed using the vertical segments of the BOP display toshow status; that is the status of each bit can be read from the BOP display.These bits can also be accessed by BiCo using the parameter number and bitstate. Set parameter P0731 to 52.b (i.e. parameter P0052, bit b), for the relay tooperate at current limit. This is actually a level 2 setting but many more settingscan be selected in level 3 using BiCo functions.

Each bit of the control and status words (r0052 to r0056) can be connected toseveral output functions.

)RUH[DPSOH

Setting P0731 to 56.5 (i.e. parameter P0056, bit 5), will indicate that starting boostis active. That is, if P1312 (Starting Boost) is set to enable some starting boost,the relay will be active during the ramping phase as starting boost is applied.

Similarly, if P0731 is set to 56.6, and P1311 (Acceleration Boost) enabled, therelay will be energized any time that the set point is changed.

Setting P0731 to 56.C would enable the relay when the Voltage Controller isactive. As this occurs during regeneration it could be used to indicate excessiveload, or too fast a ramp down.

Table 2-7 to Table 2-10 show the BiCo connections. The shaded/green boxesindicate the applicable cross connections.



2.16.4 BiCo Connections

Table 2-7 BiCo Connections (r0019 to r0054)

CO

BO

CO

CO

CO

CO

CO

CO

CO

CO

CO

CO

CO

BO

CO

BO

CO

BO

arN

r

BiC

o

0019

0020

0021

0024

0025

0026

0027

0034

0036

0037

0039

0052

0053

0054

Par

amet

er N

umbe

r

Sou

rce

Nam

e

Fun

ctio

nal G

roup

ing

CO

/BO

: BO

P c

ontr

ol w

ord

CO

: Fre

quen

cy s

etpo

int

CO

: Act

. fre

quen

cy

CO

: Act

. out

put f

requ

ency

CO

: Act

. out

put v

olta

ge

CO

: Act

. DC

-link

vol

tage

CO

: Act

. out

put c

urre

nt

CO

: Mot

or u

tiliz

atio

n

CO

: Driv

e ut

iliza

tion

CO

: Driv

e te

mpe

ratu

res

CO

: Pow

er c

onsu

mpt

ion

[kW

h]

CO

/BO

: Sta

tusw

ord

1

CO

/BO

: Sta

tusw

ord

2

CO

/BO

: Con

trol

wor

d 1

0731 CIB BI: Binary output 70800 CIB BI: Download parameter set 0 70801 CIB BI: Download parameter set 1 70840 CIB BI: ON/OFF1 70842 CIB BI: ON/OFF1 reverse 70844 CIB BI: 1. OFF2 70845 CIB BI: 2. OFF2 70848 CIB BI: 1. OFF3 70849 CIB BI: 2. OFF3 70852 CIB BI: Pulse enable 71020 CIB BI: Fixed frequency selection bit 0 71021 CIB BI: Fixed frequency selection bit 1 71022 CIB BI: Fixed frequency selection bit 2 71032 CIB BI: Inhibit reverse direction for the 71035 CIB BI: Enable MOP (UP-command) 71036 CIB BI: Enable MOP (DOWN-command) 71055 CIB BI: Enable JOG right 71056 CIB BI: Enable JOG left 71074 CIB BI: Disable additional setpoint 71110 CIB BI: Inhibit reverse direction 71113 CIB BI: Reverse 71124 CIB BI: Enable JOG ramp times 71140 CIB BI: RFG enable 71141 CIB BI: RFG start 71142 CIB BI: RFG enable setpoint 71230 CIB BI: Enable DC braking 72103 CIB BI: 1. Faults acknowledgement 72104 CIB BI: 2. Faults acknowledgement 72106 CIB BI: External fault 72220 CIB BI: Fixed PID setpoint selection bit 72221 CIB BI: Fixed PID setpoint selection bit 72222 CIB BI: Fixed PID setpoint selection bit 72235 CIB BI: Enable MOP (UP-command) 72236 CIB BI: Enable MOP (DOWN-command) 70771 CIW CI: DAC 81070 CID CI: Main setpoint 101071 CIF CI: Main setpoint scaling 101075 CID CI: Additional setpoint 101076 CIF CI: Additional setpoint scaling 102016 CIW CI: PZD to BOP-Link (USS) 202019 CIW CI: PZD to Comm-Link (USS) 202051 CIW CI: PZD to CB 202200 CIB BI: Enable PID controller 222253 CIF CI: PID setpoint 222254 CIF CI: PID trim source 222264 CIF CI: PID feedback 22




CO

BO

CO

BO

CO

CO

CO

CO

BO

CO

BO

CO

CO

CO

CO

CO

CO

CO

arN

r

BiC

o

0055

0056

0067

0071

0086

0722

0747

0755

1024

1050

1078

1079

1114

1119

Par

amet

er N

umbe

r

Sou

rce

Nam

e

Fun

ctio

nal G

roup

ing

CO

/BO

: Con

trol

wor

d 2

CO

/BO

: Sta

tusw

ord

1 fo

r V

/F a

nd V

C

CO

: Act

. max

. cur

rent

CO

: Max

. out

put v

olta

ge

CO

: Act

. act

ive

curr

ent

CO

/BO

: Bin

ary

inpu

t val

ues

CO

/BO

: Sta

te o

f bin

ary

outp

uts

CO

: Act

. AD

C c

hara

cter

istic

val

ue [4

0

CO

: Act

. fix

ed fr

eque

ncy

CO

: Out

put f

requ

ency

of t

he M

OP

CO

: Tot

al fr

eque

ncy

setp

oint

CO

: Sel

ecte

d fr

eque

ncy

setp

oint

CO

: Fre

quen

cy s

etpo

int a

fter

DIR

ctr

l

CO

: Fre

quen

cy s

etp.

of t

he A

FM

mod

ule





CO

CO

CO

CO

CO

CO

CO

CIW CO

BO

BO

BO

BO

CO

arN

r

BiC

o

1170

1242

1337

1343

1344

1801

2015

2016

2018

2032

2033

2036

2037

2050

Par

amet

er N

umbe

r

Sou

rce

Nam

e

Fun

ctio

nal G

roup

ing

CO

: Fre

quen

cy s

etpo

int

CO

: Sw

itch-

on le

vel V

dc-m

ax c

ontr

olle

CO

: Slip

freq

uenc

y

CO

: Im

ax c

ontr

olle

r fr

eq. l

imit

outp

u

CO

: Im

ax c

ontr

olle

r vo

ltage

out

put

CO

: Act

. sw

itchi

ng fr

eque

ncy

CO

: PZ

D fr

om B

OP

-Lin

k (U

SS

)

CI:

PZ

D to

BO

P-L

ink

(US

S)

CO

: PZ

D fr

om C

omm

-Lin

k (U

SS

)

BO

: Con

trol

Wor

d1 fr

om B

OP

-Lin

k (U

SS

)

BO

: Con

trol

Wor

d2 fr

om B

OP

-Lin

k (U

SS

)

BO

: Con

trol

Wor

d1 fr

om C

OM

M-L

ink

(US

S)

BO

: Con

trol

Wor

d2 fr

om C

OM

M-L

ink

(US

S)

CO

: PZ

D fr

om C

B




Table 2-10 BiCo connections (r2053 to r2294)

CO

CO

BO

BO

CO

BO

CO

CO

CO

CO

CO

CO

CO

CO

arN

r

BiC

o

2053

2054

2090

2091

2197

2224

2250

2260

2262

2266

2272

2273

2294

Par

amet

er N

umbe

r

Sou

rce

Nam

e

Fun

ctio

nal G

roup

ing

CO

: CB

iden

tific

atio

n

CO

: CB

dia

gnos

is

BO

: Con

trol

Wor

d 1

from

CB

BO

: Con

trol

wor

d 2

from

CB

CO

/BO

: Sta

tusw

ord

1 of

mon

itor

CO

: Act

. fix

ed P

ID s

etpo

int

CO

: Out

put s

etpo

int o

f the

MO

P

CO

: PID

set

poin

t

CO

: PID

filte

red

setp

oint

CO

: PID

feed

back

CO

: PID

sca

led

feed

back

CO

: PID

err

or

CO

: PID

out

put




2.17 Acoustic Noise

Laboratory tests have determined the level of noise generated by the range ofMICROMASTER 420 Inverters.

7HVW&RQGLWLRQV

1 The inverters were set up to run a standard 4-pole Siemens motor atfrequencies from 0 – 100 Hz.

2 All specified switching frequencies were tested with loads of 25%, 50%,75% and 100%.

3 The sound level recorder was set up 1 metre from the inverter being tested.

4 The motor was situated outside the noise area and the meter then set torecord the levels of noise at three areas around the inverter:

a. At the front of the inverterb. At the rear of the inverterc. At the right hand side of the inverter

The sound levels were measured with the inverter running and stopped, i.e. withthe fan on and off. Table 2-11 shows the average results, (in decibels).

Table 2-11 Acoustic Test Results

)DQ5XQQLQJ )DQQRWUXQQLQJ$UHDRILQYHUWHUWHVWHG

,QYHUWHU$G%

,QYHUWHU%G%

,QYHUWHU&G%

,QYHUWHU$G%

,QYHUWHU%G%

,QYHUWHU&G%

Front of inverter(BOP area) 52.0 54.0 61.0 51.0 50.0 50.0

Rear of inverter 52.0 55.0 64.0 51.0 51.0 50.0

Right hand sideof inverter 60.0 59.0 70.0 52.0 51.0 51.0

1RWHInverter A: MICROMASTER 420 FSA 230 V 750 W 1-ph filteredInverter B: MICROMASTER 420 FSB 230 V 2.2 kW 1-ph filteredInverter C: MICROMASTER 420 FSC 230 V 5.5 kW 3-ph filtered



2.18 Harmonic Currents

+DUPRQLFFXUUHQWVZLWKPDLQVLPSHGDQFH

Table 2-12 Single Phase 230V Connection

0/)% )LOWHU7\SH 3RZHU&7N:

)XQGDPHQWDO$PSV

UG

$PSVWK

$PSVWK

$PSVWK

$PSVWK

$PSVWK

$PSV

6SE6420-2AB11-2AA0 A

6SE6420-2UC11-2AA0 UNFILTERED0.12 1.34 1.10 0.71 0.34 0.13 0.10 0.08

6SE6420-2AB12-5AA0 A


6SE6420-2AB13-7AA0 A


6SE6420-2AB15-5AA0 A


6SE6420-2AB17-5AA0 A


6SE6420-2AB21-1BA0 A

6SE6420-2UC21-1BA0 UNFILTERED1.1 9.33 7.77 5.24 2.67 0.96 0.67 0.61

6SE6420-2AB21-5BA0 A


6SE6420-2AB22-2BA0 A


6SE6420-2AB23-0CA0 A

6SE6420-2UC23-0CA0 UNFILTERED3 23.02 19.14 12.76 6.38 2.09 1.49 1.40

Table 2-13 Three Phase 230V Connection


)XQGDPHQWDO$PSV

WK

$PSVWK

$PSVWK

$PSVUG

$PSVWK

$PSVVW$PSV

6SE6420-2UC11-2AA0 UNFILTERED 0.12 0.46 0.25 0.04 0.02 0.01 0.00 0.00





6SE6420-2UC21-1BA0 UNFILTERED 1.1 4.35 2.46 0.33 0.15 0.08 0.06 0.04



6SE6420-2UC23-0CA0 UNFILTERED 3 11.20 6.41 0.84 0.36 0.20 0.11 0.12

6SE6420-2UC24-0CA0 UNFILTERED 4 11.20 6.41 0.84 0.36 0.20 0.11 0.12

6SE6420-2UC25-5CA0 UNFILTERED 5.5 13.90 7.77 1.00 0.45 0.25 0.13 0.11



Table 2-14 Three Phase 400V Connection


)XQGDPHQWDO$PSV

WK

$PSVWK

$PSVWK

$PSVUG

$PSVWK

$PSVVW$PSV

6SE6420-2UD13-7AA0 UNFILTERED 0.37 0.46 0.30 0.00 0.00 0.00 0.00 0.00





6SE6420-2AD22-2BA0 A 2.2

6SE6420-2UD22-2BA0 UNFILTERED 2.22.71 1.70 0.10 0.10 0.00 0.00 0.00

6SE6420-2AD23-0BA0 A 3

6SE6420-2UD23-0BA0 UNFILTERED 33.70 2.20 0.10 0.10 0.10 0.00 0.00

6SE6420-2AD24-0BA0 A 4

6SE6420-2UD24-0BA0 UNFILTERED 44.92 2.90 0.20 0.10 0.10 0.00 0.00

6SE6420-2AD25-5CA0 A 5.5

6SE6420-2UD25-5CA0 UNFILTERED 5.56.78 4.20 0.20 0.10 0.10 0.10 0.00

6SE6420-2AD27-5CA0 A 7.5

6SE6420-2UD27-5CA0 UNFILTERED 7.59.24 5.60 0.30 0.10 0.10 0.10 0.10

6SE6420-2AD31-1CA0 A 11

6SE6420-2UD31-1CA0 UNFILTERED 1113.53 7.90 0.50 0.10 0.10 0.10 0.10



2.19 Power Losses

Figure 2-16 shows the power loss for the MICROMASTER 420 Inverters. Thegraphs can be used to read either the loss at full load of a particular variant or toread the part load loss. For example, the full load loss of a 0.55 kW 400 V inverteris 52 W; the loss from a 2.2 kW 230 V unit at 50% load is approximately 82 W.

Figure 2-16 Power Losses

)UDPH6L]H$9003RZHUORVVHV

0

10

20

30

40

50

60

70

80

0.12 0.25 0.37 0.55 0.75

3RZHURXWSXWN:

3RZHU/RVV:

)UDPH6L]H$9003RZHUORVVHV

0

20

40

60

80

100

120

140

160

0.37 0.55 0.75 1.1 1.5

3RZHURXWSXWN:

3RZHU/RVV:

)UDPH6L]H%9003RZHUORVVHV

0

20

40

60

80

100

120

140

160

1.1 1.5 2.2

3RZHURXWSXWN:

3RZHU/RVV:

)UDPH6L]H&9003RZHUORVVHV

0

50

100

150

200

250

300

350

400

450

3 4 5.5

3RZHURXWSXWN:

3RZHU/RVV:

)UDPH6L]H%9003RZHUORVVHV

0

50

100

150

200

250

2.2 3 4

3RZHURXWSXWN:

3RZHU/RVV:

)UDPH6L]H&9003RZHUORVVHV

0

50

100

150

200

250

300

350

400

450

500

5.5 7.5 11

3RZHURXWSXWN:

3RZHU/RVV:

,QWHUQDWLRQDO(QJOLVK &20081,&$7,216


3 Communications

This chapter contains detailed information on the operation of the Universal SerialBus (USS) and the PROFIBUS protocol .

&RQWHQWV

3.1 Using the Serial Interface ........................................................................................41

3.2 Working with Serial Communications......................................................................41

3.2.1 Introduction ..............................................................................................................41

3.2.2 Troubleshooting with RS485 ...................................................................................42

3.3 Using the Universal Serial Interface Protocol..........................................................43

3.3.1 Telegram structure ..................................................................................................43

3.3.2 Detailed Description of the USS Protocol Message................................................43

3.3.3 Useful Data Characters ...........................................................................................44

3.3.4 Tasks and reply for USS..........................................................................................47

3.3.5 PKW Examples:.......................................................................................................49

3.3.6 PZD area (Process Data area) ................................................................................51

3.3.7 Task telegram (Master → MICROMASTER 420)....................................................52

3.3.8 Reply telegram (MICROMASTER 420 → Master) ..................................................53

3.3.9 Parameter settings on MICROMASTER 420 for USS.............................................55

3.3.10 Basic Setup..............................................................................................................56

3.3.11 Common advanced settings ....................................................................................56

3.3.12 Further advanced settings .......................................................................................57

3.3.13 Compatibility with previous MICROMASTER products ...........................................57

3.3.14 Reading and Writing Parameters ............................................................................58

3.3.15 Broadcast Mode.......................................................................................................58

3.3.16 Using BiCo with USS...............................................................................................59

3.4 PROFIBUS ..............................................................................................................60

3.4.1 Overview..................................................................................................................60

3.4.2 Using the PROFIBUS ..............................................................................................60

3.5 PROFIBUS Module .................................................................................................61

3.5.1 Features of PROFIBUS Module ..............................................................................61

&20081,&$7,216 ,QWHUQDWLRQDO(QJOLVK


)LJXUHV

Figure 3-1 Typical RS485 Multidrop Interface........................................................................................42

Figure 3-2 Telegram Structure...............................................................................................................43

Figure 3-3 Address (ADR) Bit Numbers.................................................................................................44

Figure 3-4 Useful Data Characters ........................................................................................................44

7DEOHV

Table 3-1 Defined Task ID....................................................................................................................47

Table 3-2 Defined Reply ID ..................................................................................................................47

Table 3-3 Defined Error Values for Reply ID = Task cannot be executed ............................................48

Table 3-4 PZD Area Structure ..............................................................................................................51

Table 3-5 Inverter Control Word (STW)................................................................................................52

Table 3-6 Inverter Status Word (PZD) ..................................................................................................53

Table 3-7 Practical Examples ...............................................................................................................54

Table 3-8 Comparison Table (MICROMASTER 420/Earlier MICROMASTER) ....................................58

Table 3-9 Assignment of the PROFIBUS SUB-D socket connector .....................................................63

Table 3-10 Maximum Cable Lengths for Data Transfer Rates................................................................63

Table 3-11 Order Numbers for Connectors and Cables .........................................................................63

Table 3-12 Technical data ......................................................................................................................64

Table 3-13 PROFIBUS Ordering information..........................................................................................64



3.1 Using the Serial Interface

All Siemens Inverters include a serial interface as standard. The serial interfaceuses an RS485 two wire connection which is designed for industrial applications.

Up to 30 inverters may be connected on a single RS485 link, and inverters can beaddressed individually or with a broadcast message. A separate master controlleris required and the inverters act as slaves.

Using a serial interface has several advantages:

• Wiring can be greatly reduced.

• Control functions can be changed without re-wiring.

• Parameters can be set up and changed via the interface.

• Performance can be continuously monitored and controlled.

3.2 Working with Serial Communications

3.2.1 Introduction

This section describes the hardware aspects of the serial communications that areused with the MICROMASTER 420. It does not discuss or detail the softwareprotocols that are used or how to debug software. Software protocols arediscussed later in the manual.

:KDWDUH56DQG56"

Serial communications use carefully defined hardware and software protocols.

The software protocol defines the baudrate, wordlength, meaning etc. of the signal,and can be defined by a designer for his particular needs. Standards can also bespecially developed, but most users adopt an existing standard. Typical standardsare RS232 and RS485. These define voltages, impedance etc. but not thesoftware protocol.

56

This standard is used by Personal Computers for interfacing to a peripheral. Whenfully implemented it uses many interconnecting wires and protocols to exchangedata. In its most simple form it consists of three wires, transmit (Tx) receive (Rx)and ground (GND). It is designed for communication between two machines onlyover a short distance, therefore the Tx line of one machine connects to the Rx ofanother, and vice-versa. Voltage levels are typically +/- 12 V .

56

This standard is more versatile. It is designed for communications between manymachines, has a high noise immunity and allows operation over long distances (upto 1000m). It uses differential voltages, switching between 0 and 5 V. All Siemensdrives use RS485 hardware protocol and some offer RS232 interfaces as well.



P Signal

N Signal

5 V

P+

N-

Figure 3-1 Typical RS485 Multidrop Interface

3.2.2 Troubleshooting with RS485

The following notes should help to understand hardware problems that occur withRS485 systems and Siemens inverters.

RS485 is used extensively during the testing of the MICROMASTER 420 inproduction, and is therefore fully tested before the unit is shipped.

Hardware problems with RS485 are often associated with reversed polarity. It isessential that P+ and N- are correctly connected in all cases. On some earlierproducts these were labelled A and B.

Termination resistors are recommended in industrial environments. A value of120 Ω between the P + and N - inputs is recommended, and should be fitted to theinverter furthest from the controller. Occasionally additional biasing resistors maybe placed between P+ and 24 V, N- and 0 V, but these are not usually necessaryas internal biasing resistors are fitted to units.

Always test an RS485 system in the most simple arrangement possible. Forexample, use a controller with one inverter and use the default address and baudrates.

Look at the bus with an oscilloscope. The inverter will always respond to a validmessage. This means that the inverter listens to the bus at all times, and will replyto all messages with the correct identifier and Cyclic Redundancy Check (CRC).The only exception is the broadcast message, which none of the invertersanswers.

Check the Inverter Address. All inverters on a bus MUST have differentaddresses, even if they are in local control. The inverters will always reply to avalid message, even if serial control is not enabled.



3.3 Using the Universal Serial Interface Protocol

The Universal Serial Interface Protocol (USS) protocol defines an accesstechnique according to the master-slave principle for communications via a serialbus. One master and a maximum of 31 slaves can be connected to the bus. Theindividual slaves are selected by the master via an address character in thetelegram. A slave itself can never transmit without first being requested to do so,and direct message transfer between the individual slaves is not possible.

3.3.1 Telegram structure

Each telegram starts with the STX character (= 02 hex), followed by the lengthspecification (LGE) and the address byte (ADR). The useful data characters thenfollow. The telegram is terminated by the block check character (BCC).

STX LGE ADR 1 2 … …. n BCC

|< ---- Useful data characters ---- >|

Figure 3-2 Telegram Structure

3.3.2 Detailed Description of the USS Protocol Message

67; The STX field is a single byte ASCII STX character (02 hex) used toindicate the start of a message.

/*( The LGE is a single byte field indicating the number of bytes, whichfollow this in the message. According to the USS specification, thetelegram length is variable, and the length must be specified in the 2nd

telegram byte (i.e. LGE). Depending on the configuration, fixedtelegram lengths can be defined (see description of PKE and PZDareas). Different telegram lengths can be used for different slave nodeson the bus. The maximum total length of a telegram is 256 bytes. TheLGE is defined as the useful data characters (quantity n), address byte(ADR) and the block check character (BCC). The actual total telegramlength will of course be two bytes longer than the LGE as the STX andLGE bytes are not counted in the LGE.

For MICROMASTER 420 variable length telegrams and fixed lengthtelegrams can both be used. This can be selected using parametersP2012 and P2013 to define the PZD and PKW lengths. Most commonfixed length applications will use a 4-word (8-byte) PKW area and a 2-word (4-byte) PZD area giving 12 useful data characters.

This gives the LGE = 12 + 2 = 14

$'5 The ADR field is a single byte containing the address of the slave node(e.g. inverter). The individual bits in the address byte are addressed asshown in Figure 3-3.



7 6 5 4 3 2 1 0

0 X X

< --- slave node addresses0 - 31

--- >

Figure 3-3 Address (ADR) Bit Numbers

Bit 5 is the broadcast bit. If it is set to 1, the message is a broadcast message andwill be acted upon by all inverters on the serial link. The node number is notevaluated. The USS protocol specification requires certain settings in the PKWarea. Refer to the later example on using USS broadcast mode.

Bit 6 indicates a mirror telegram. The node number is evaluated and theaddressed slave returns the telegram unchanged to the master.

The unused bits should be set to 0.

%&& The BCC field is a byte-sized checksum used to validate messages. Itis calculated by XORing together all the previous bytes in the message.

If the Inverter receives a message with an invalid message it will discardthe message and not send a reply.

3.3.3 Useful Data Characters

The useful data block is divided into two areas, the PKW area (parameter ID –value area) and the PZD area (process data).

|< --- PKW area --- >| |< --- PZD area --- >|

PKE IND PWE1 PWE2 …… PWEn PZD1 PZD2 ……. PZDn

Figure 3-4 Useful Data Characters

3.:DUHD3DUDPHWHU,'±YDOXHDUHD

The PKW area relates to the handling of the parameter ID - value (PKW) interface.The PKW interface is not a physical interface but a mechanism which handlesparameter transfer between two communication partners (e.g. control unit andinverter). This involves, for example, reading and writing parameter values.

6WUXFWXUHRI3.:DUHD

The first two words of the PKW area (PKE and IND) give information regarding thetask requested by the master (Task ID) or the type of reply telegram (Reply ID).They also define the inverter parameter number (PNU) which is being accessed bythe telegram. The PNU number refers to MICROMASTER 420 parameter numberse.g. 1082 = P1082 = Fmax.

VW:RUG

VW:RUG%LW 3.( 3DUDPHWHU,'

Bits15-12 AK = Task or reply ID. See below.

Bit 11 SPM = parameter change report. Not supported (always 0).

Bits10-00 b. PNU = basis parameter number. The complete PNU will be builttogether with Bits 15-12 from the IND(index). See below.



QG:RUG

QG:RUG%LW ,1' 3DUDPHWHULQGH[

Bits15 14 13 12(20 23 22 21)

PNU extension (PNU page). See below.

Bit 11-10 Reserved. Not used.

Bits09-08 Selected the text type + read or write text. Not used.

Bits07-00 Index (which element): Which parameter value. Which description element. Which index text are meaning. Which value text are meaning.

The value 255 = All values ofan index parameter or allelements of the parameterdescription. This is onlypossible when P2013 =127.

The complete parameter number is generated from the basis parameter number inthe parameter task / reply ID (bits 0 -10) and the bits 12-15 in the index (PNUpage).

%DVLV318LQWKHWDVNUHSO\,'ELWV

318SDJHLQWKHLQGH[ELWV

&RPSOHWH318 EDVLV318318SDJH

0 ... 1999 0 0 ... 1999

0 ... 1999 1 2000 ... 3999

0 ... 1999 2 4000 ... 5999

0 ... 1999 3 6000 ... 3999

0 ... 1999 4 8000 ... 9999

.... ... ...

0 ... 1999 15 30000 ... 31999

1RWHBit 15 has the weighting 20 so that this bit must be set for parameter numbers 2000to 3999. MICROMASTER 420 does not have parameter numbers greater than3999.

The 3rd and 4th words, PWE1 and PWE2 contain the parameter value for theparameter being accessed. There are a number of different parameter value typeson MICROMASTER 420; integer values (single or double words), decimal values(given in IEEE float values, always double words) and indexed parameters(referred to here as array values). The meaning of the parameter value isdependent on the parameter value type (middle column) and the setting of P2013(right hand column).

UG:RUG

UG:RUG%LW 3:( VWSDUDPHWHUYDOXH

Bits15 - 0 = Parameter value for non array parameter.= nth parameter value for array parameter and task fornth element.

When value of P2013= 3 (fixed) or= 127 (variable length) and single word parameter.

= 1st parameter value for array parameter and task forall elements.

When value of P2013= 127 (variable length) and single word parameter.

= 0. When value of P2013= 4 (fixed) and single word parameter.

= High word of parameter value (non array).= High word of nth parameter value for arrayparameter and task for nth element.

When value of P2013= 4 (fixed) or= 127 (variable length) and double word parameter.

= High word of 1st parameter value for arrayparameter and task for all elements.

When value of P2013= 127 (variable length) and double word parameter.

Error value. Slave Å Master and replay ID =Task cannot be executed.



WK:RUG

WK:RUG%LW 3:( QGSDUDPHWHUYDOXH

Bits15 - 0 = 2nd Parameter value for array parameters and taskfor all elements.

When value of P2013= 4 (fixed) or= 127 (variable length) and single word parameter.

= Low word of parameter value (no array).= Low word of nth parameter value for arrayparameter and task for nth element.

When value of P2013= 4 (fixed) or= 127 (variable length) and double word parameter.

= Low word of 1st parameter value for array parameterand task for all elements.

When value of P2013.= 127 (variable length) and 32 bits parameter.

= Next accessible ID. Slave Å Master and replay ID =Task cannot be executed.Error value = ID not exist or IDnot accessible. When value of P2013= 127 (variable length).

= Next or previous valid value (16 bit).= High word of the next or previous valid value (32bit).In the right order:If new value > actual value Å next valid value.If new value < actual value Å previous valid value.

Slave Å Master and replay ID =Task cannot be executed.Error value = Value noadmissible or New max. /min.value exist. When value of P2013= 127 (variable length).

1RWHV

• If a parameter value is requested by the master, the values in PWE1 andPWE2 of the master telegram to the inverter are ignored.

• The meaning of the 3rd and 4th words, PWE1 and PWE2 is dependent onwhether variable or fixed length PKW has been selected using P2013.The examples should explain this more clearly later in this section.

• The MICROMASTER 420 parameter list must be consulted to understandthe meaning of the parameter values, and their appropriate settings.



3.3.4 Tasks and reply for USS

Table 3-1 Defined Task ID

5HSO\,'7DVN,' 0HDQLQJSRVLWLYH QHJDWLYH

0 No task. 0 -

1 Request parameter value. 1 or 2 7

2 Change parameter value (word) [RAM only]. 1 7 or 8

3 Change parameter value (double word) [RAM only]. 2 7 or 8

4 Request description element. 3 7

5 Change description element (not possible with MICROMASTER 420). - -

6 Request parameter value (array) i.e. indexed parameter. 4 or 5 7

7 Change parameter value (array, word) [RAM only]. 4 7 or 8

8 Change parameter value (array, double word) [RAM only]. 5 7 or 8

9 Request the number of array elements i.e. no. of indices. 6 7

10 Reserved. - -

11 Save parameter value (array, double word) [RAM and EEPROM]. 5 7 or 8

12 Save parameter value (array, word) [RAM and EEPROM]. 4 7 or 8

13 Save parameter value (double word) [RAM and EEPROM]. 2 7 or 8

14 Save parameter value (word) [RAM and EEPROM]. 1 7 or 8

15 Read or change text (not possible with MICROMASTER 420). - -

If the length of PKW is fixed (3 or 4) using P2013, then the Master must alwayscorrectly send either 3 or 4 words in the PKW area (if not, the slave will notrespond to the telegram). The slave reply PKW will be either 3 or 4 words as well.If a fixed length is used with MICROMASTER 420, this should be 4, as 3 would notbe sufficient to support many of the parameters (i.e. double words). For variablelength of PKW (127) the Master sends only the necessary number of words for thetask in the PKW area. The length of the reply telegram will also only be as long asnecessary. The examples shown later should explain this more clearly.

Table 3-2 Defined Reply ID

5HSO\,' 0HDQLQJ )RU7DVN,'

0 No reply. 0

1 Transfer parameter value (word). 1, 2 or 14

2 Transfer parameter value (double word). 1, 3 or 13

3 Transfer description element. 4

4 Transfer parameter value (array, word). 6, 7 or 12

5 Transfer parameter value (array, double word). 6, 8 or 11

6 Transfer the number of array elements. 9

7 Task cannot be executed (with error value). 1 to 15

8 No change rights for the parameter interface. 2, 3, 5, 7, 8,11 to 14 or 15 (and change text).

9 – 12 Not used. -

13 Reserved. -

14 Reserved. -

15 Transfer text. 15



Table 3-3 Defined Error Values for Reply ID = Task cannot be executed

5HSO\,' 0HDQLQJ )RU7DVN,'

0 Parameter number not available. 1 to 15

1 Parameter value can not be changed (only read parameter). 2, 3, 7, 8 or 11 to 14

2 Lower or upper limit exceeded. 2, 3, 7, 8 or 11 to 14

3 Erroneous index.1RWH (no valid for task 4):If the parameter in the drive is not array, than the drive will be replywith this error only if the index is > 1.For index = 0 or 1 the task will be executed. The Reply ID is than = 4or 5.

4, 6, 7, 8, 11 or 12

4 No array.1RWH:If the parameter in the drive is not array, than the drive will be replywith this error only if the index is > 1.For index = 0 or 1 the task will be executed. The Reply ID is than = 4or 5.

6, 7, 8, 11 or 12

5 Incorrect type of data. 2, 3, 7, 8 or 11 to 14

6 Parameter can only be set to 0. 2, 3, 7, 8 or 11 to 14

17 Drive converter status does not permit the set task at the moment. 2, 3, 7, 8 or 11 to 14

101 Parameter number deactivated at the moment; Parameter has no functionin the present state of the drive converter (e.g. type of closed-loopcontrol).

1 to 15

102 Reply length to long. Dependent of the numberof PKW and the max. netdata length in the inverter.

104 Parameter value not permissibleThis error number is transferred if the parameter value which is to betransferred does not have an assigned function in the drive converter orcannot be accepted at the instant of the change for internal reasons(although it lies within the limits).

2, 3, 7, 8 or 11 to 14

106 Task not supported. 5, 10 or 15

200 New lower limit. 2, 3, 7, 8 or 11 to 14

201 New upper limit. 2, 3, 7, 8 or 11 to 14

203 No display on the BOP / AOP.Parameter must be hidden on the BOP / AOP.

1 to 15

204 The parameter "BOP / AOP Read access" not have the required level (incombination with parameter P3950 "SC". "SC" = Secret password).

1 to 15

1RWHOnly the Error values from the Basic System Inverters are described.

3DUDPHWHUW\SHV

A number of different parameter types are employed on MICROMASTER 420:integer, IEEE float etc. The parameter type is given in the Parmeter List as follows:

U16: 16-bit unsigned (single word)U32: 32-bit unsigned (double word)I16: 16-bit integer (single word)I32: 32-bit integer (double word)Float: IEEE float format (double word)

I16 and I32 are not used for user parameters on MICROMASTER 420. U32 aredouble word integers e.g. P0731. Here the integers are separated by a decimalpoint. The part before the decimal point appears in PWE1 while the part after thedecimal point appears in PWE2.



3.3.5 PKW Examples:

Reading and writing parameter values:

It is always possible to use a 4 word PKW in the master even when P2013 =127=variable length. For the examples this will always be used and will be shown inhexadecimal format. The reply PKW telegram will either be 3 or 4 words longdepending on the parameter value type.

5HDGDSDUDPHWHUYDOXHZLWKSDUDPHWHUQXPEHUEHWZHHQDQG

To read a parameter you should use the Task ID 1 "request parameter value". TheReply ID will be either 1 or 2 (single or double word respectively) or 7 (error).

([DPSOHRead parameter P0700. (700 = 2BC (hex))

866→0,&520$67(5%& requests value of P0700.

0,&520$67(5→866%&the reply tells us this is a single word withvalue 0002 (hex).

([DPSOHRead parameter P1082. (1082 = 43A (hex))

866→0,&520$67(5$ requests value of P1082.

0,&520$67(5→866$the reply tells us this is a double wordwith value 4248 0000 (IEEE float value).The IEEE float format is as follows:Bit 31 = sign,Bit 23 to Bit 30 = exponent andBit 0 to Bit 22 = mantissa,with the decimal value being given by:

value = ((-1) to power of sign)x (2 to power of (exponent - 127))x 1.Mantissa).

For this example:sign = 0,exponent = 84 (hex) = 132mantissa (1).900000 = [1 + 9/16 + 0/256...]giving (1)x(32)x(1.5625) = 50.00.

5HDGDSDUDPHWHUYDOXHZLWKSDUDPHWHUQXPEHUEHWZHHQDQG

To read a parameter between 2000 and 3999, you must set the PNU extension inthe 2nd word (IND).

866→0,&520$67(5 requests value of P2000.

0,&520$67(5→866 the reply tells us this is a double wordwith value 4248 0000 (IEEE float value)i.e. 50.00.



5HDGDSDUDPHWHUYDOXHIRUDQLQGH[HGSDUDPHWHU

To read the value of a parameter index you must define the index in bits 0 to 7 ofthe 2nd PKW word (IND).

([DPSOHRead parameter P2010, index 1 (2010 = 00A and Bit 15 of IND).

866→0,&520$67(5$ requests value of P2010 index 1.

0,&520$67(5→866$ the reply tells us this is a single wordwith value 6 (hex).

1RWHIt would also be possible to use Task ID 6 here.

&KDQJLQJDSDUDPHWHUYDOXH>5$0RQO\@

To write to a parameter, you must know whether it has a single or double wordparameter value and use the Task ID 2 or 3 appropriately. To find this out, you canfirst read the parameter value via USS. (The information is also available in theParameter List).

([DPSOHChange the value of P1082 to 40.00

6WHSRead value:

866→0,&520$67(5$

0,&520$67(5→866$ the Reply ID 2 shows us that this is adouble word so we will need to usethe Task ID 3 "change parametervalue (double word) [RAM only]".

6WHSChange parameter value to 40.00 (= 4220 0000 (IEEE float value)).

866→0,&520$67(5$

0,&520$67(5→866$ this confirms the value has beenchanged.

1RWHV

• Had the message 243A 0000 4220 0000 been sent, the reply would be743A 0000 0005 indicating an error number 5 = " incorrect data type".

• P1082 (Fmax) cannot be changed while the inverter is running. Had thecorrect change telegram been sent while the inverter was running, thereply would have been 743A 0000 0011, indicating error number 17 ="drive converter status does not permit the set task at the moment".

• If you want the changed value to be stored in the EEPROM, the Task ID13 (=D hex) should be used.



8VLQJ3WRVHWWKH3.:OHQJWK

This is a level 3 parameter, so you must set P0003 = 3 to access it. There are fourpossible settings, 0, 3, 4 and 127. For MICROMASTER 420 the most useful are127 = variable= [default setting] or 4. It is important to note that if the setting 4 isused, the parameter values will appear in PWE2, not PWE1 when reading orchanging single word parameter values:

([DPSOH P2013 = 127:

Set P0700 to value 5(0700= 2BC (hex)).

866→0,&520$67(5%&

0,&520$67(5→ 866%&

([DPSOHP2013 = 4

866→0,&520$67(5%&

0,&520$67(5→866%&

1RWHV

• Setting P2013 to 3 would not allow double word (i.e. non-integer) parametervalues to be accessed.

• ,03257$17 On 1.05 software version the parameter value for VLQJOHZRUGSDUDPHWHUvaluesappears in PWE1 rather than PWE2 when P2013 is set to 4.This will be corrected in the next software release. If you have 1.05 software (seeparameter r0018) and intend reading or writing single word parameter values viathe PKW (i.e. parameters with non-BiCo integer values such as P0700 etc), wewould recommend not using the setting P2013 = 4 as the above handling error willnot be supported in later software. If the PKW is only used for reading and writingdouble word parameters (e.g. ramp times etc) there will be no problem with thesetting P2013 = 4.

3.3.6 PZD area (Process Data area)

The PZD area of the telegram is designed for control and monitoring of theinverter. The received PZD is always processed with high priority in the masterand the slave. PZD processing has priority over PKW processing, and alwaystransfers the most current data available at the interface.

Table 3-4 PZD Area Structure

PZD1 PZD2 PZD3 PZD4

0DVWHU→0,&520$67(5

STW HSW HSW2 STW2

0,&520$67(5→0DVWHU

ZSW HIW ZSW2 HIW2

The MICROMASTER 420 normally uses a 2 word PZD, although it is possible forthe inverter to operate with PZDs of 0 to 4 word lengths, depending on the settingof P2012 (level 3). Examples of non-2 word PZDs will be discussed later.



3.3.7 Task telegram (Master → MICROMASTER 420)

67: The first word of the PZD task telegram is the inverter control word (STW).Provided that the inverter is being controlled over USS, (see parameterP0700), the control word has the following meaning:

Table 3-5 Inverter Control Word (STW)

Bit 00 "On (Ramp-up) / OFF1 (Ramp-down)". 0 NO 1 YES

Bit 01 "OFF2: electrical stop". 0 YES 1 NO

Bit 02 "OFF3: Fast stop". 0 YES 1 NO

Bit 03 "Pulse enable". 0 NO 1 YES

Bit 04 "RFG enable". 0 NO 1 YES

Bit 05 "RFG start". 0 NO 1 YES

Bit 06 "Setpoint enable". 0 NO 1 YES

Bit 07 "Fault acknowledge". 0 NO 1 YES

Bit 08 "Jog right". 0 NO 1 YES

Bit 09 "Jog left". 0 NO 1 YES

Bit 10 "Control from PLC". 0 NO 1 YES

Bit 11 "Setpoint inversion. 0 NO 1 YES

Bit 12 Not assigned.

Bit 13 "Motorpoti raise". 0 NO 1 YES

Bit 14 "Motorpoti lower". 0 NO 1 YES

Bit 15 Local / Remote. 0 P0719 ind 0 1 P0719 ind 1

1RWHV

• Bit 10 must be set to 1 for the control word to be accepted by the inverter.If bit 10 is 0, the control word will be ignored and the inverter will continueto operate as it was before.

• The local / remote function using Bit 15 is not possible on early releasesoftware (r0018 = 1.05).

+6: The second word of the PZD task telegram is the main setpoint(HSW). This will be the main frequency setpoint provided the mainsetpoint source is USS, (see parameter P1000).

There are two different ways in which this can be defined dependingon the setting of P2009 (“USS normalization”).

If this is set to 0, the value is sent as a hexadecimal number where4000 (hex) is normalized to the frequency set in P2000.

If P2009 is set to 1, the value is sent as an absolute decimal value(e.g. 4000 decimal (=0FA0 hex) is interpreted as 40.00 Hz.)



3.3.8 Reply telegram (MICROMASTER 420 → Master)

=6: The first word of the PZD reply telegram is the inverter status word(ZSW). This is normally the inverter status word as defined inparameter r0052. This is defined as follows:

Table 3-6 Inverter Status Word (PZD)

Bit 0 Drive ready. 0 NO 1 YES

Bit 1 Drive ready to run. 0 NO 1 YES

Bit 2 Drive running. 0 NO 1 YES

Bit 3 Drive fault active. 0 YES 1 NO

Bit 4 OFF2 active. 0 YES 1 NO

Bit 5 OFF3 active. 0 NO 1 YES

Bit 6 Switch on inhibit active. 0 NO 1 YES

Bit 7 Drive warning active. 0 NO 1 YES

Bit 8 Deviation setpoint / actual value. 0 YES 1 NO

Bit 9 PZD control (Process Data Control) 0 NO 1 YES

Bit 10 Maximum frequency reached. 0 NO 1 YES

Bit 11 Warning: Motor current limit. 0 YES 1 NO

Bit 12 Motor holding brake active. 0 YES 1 NO

Bit 13 Motor overload. 0 YES 1 NO

Bit 14 Motor running direction right. 0 NO 1 YES

Bit 15 Inverter overload. 0 YES 1 NO

You wish to choose a different status word for the reply telegram. This can bedone by defining the source of the status word in index 0 of parameter P2016 orP2019. These are both level 3 parameters, so P0003 must = 3 to access theseparameters.

+,: The second word of the PZD reply telegram is the main actual value(HIW). This is normally defined as the inverter output frequency. Thenormalization via P2009 (as explained above) also applies to this value.

If you wish to choose a different actual value for the reply telegram, thiscan be done by defining the source of the actual value in index 1 ofparameter P2016 or P2019, (e.g. the setting 27 would give actualcurrent). These are both level 3 parameters, so P0003 must = 3 toaccess these parameters.



Table 3-7 Practical Examples

([DPSOH 5XQULJKWDW+]

6WHS $FWLRQ

a. P0700 must be set to 4 or 5 (USS via RS232 or RS485 respectively)

b. P1000 must be set to 4 or 5 (USS via RS232 or RS485 respectively)

c. Send PZD command 047E 3333 (hex).The reply telegram should be FA31 0000.If the BOP is connected, r0000 should display flashing 40.00 Hz

d. Send PZD command 047F 3333 (hex).The inverter should now run up to 40.00 Hz using the ramp rate set in P1120.

e. To stop the inverter send 047E 0000 (hex) or 047E 3333 (hex)

([DPSOH -2*XVLQJ866

6WHS $FWLRQ

a. P0700 must be set to 4 or 5 (USS via RS232 or RS485 respectively)

b. The inverter must be stopped and ready to run.To achieve this send the PZD command 047E 0000 (hex).The inverter should reply with FA31 0000 (hex)

c. To JOG RIGHT send 057E 0000 (hex)

d. To JOG LEFT send 067E 0000 (hex)

e. To STOP send 047E 0000 (hex)

To change the JOG direction without stopping, use control bits 8 and 9. Forexample, 067E 0000 after 057E 0000 will cause the inverter to change JOGdirection from left to right without stopping.

1RQZRUG3='V

Using P2012 (level 3) it is possible to define the length of the PZD telegram from 0to 4 words. In this case the PZD3 of the task telegram is another setpoint (HSW2)which could be freely connected using BiCo. Similarly the PZD4 is a secondcontrol word for the inverter. This has no specific meaning, but the individual bitscan be freely connected using BiCo to realize functions such as “Use Jog ramptimes” etc. The example “Using BiCo with USS” should give an indication of howthis can be achieved.

8VLQJ866%URDGFDVWPRGH

USS Broadcast mode allows all slaves to be addressed with a single telegram,thus allowing groups of inverters to be started and stopped simultaneously.



7HOHJUDPVWUXFWXUH

$'5 Bit 5 must be set to 1, other bits should be set to 0 (equivalent to slaveaddress 32 (dec)).

3.: The PKW area must be ZRUGVORQJ. As a minimum the first word hasto have bits 15, 2 and 1 high and the second word has to have bits 15and 0 high. Words 3 and 4 are not evaluated. This gives the followingPKW telegram: (hex). This is defined in the USSspecification. You could also send FFFF FFFF FFFF FFFF in the PKWarea as this sets the necessary bits.

1RWHThe PKW cannot be used for reading or writing parameter values in Broadcastmode.

3=' Both PZD words are used as normal, and all inverters reactsimultaneously to the command and setpoint.

No reply telegram is generated by the LQGLYLGXDO slaves in response to a broadcasttelegram.

3.3.9 Parameter settings on MICROMASTER 420 for USS

The MICROMASTER 420 has two possible serial interfaces which can be used forUSS communication: RS232 and RS485. The RS232 is realized using an optionmodule (order no. 6SE6400-1PC00-0AA0). The RS485 interface uses terminals14 and 15 for P+ and N- respectively.

In the parameter documentation, USS via RS485 is sometimes referred to asUSS2 while USS via RS232 is referred to as USS1. In each case the telegramstructure is the same. The USS parameters usually contain two indices, index 0for RS485 and index 1 for RS232.



3.3.10 Basic Setup

If In order to communicate via USS, it is necessary to decide whether the RS485 orRS232 interface on the inverter is being used. This will determine which index inthe USS parameters are to be set.

P0003 = 2(necessary to access level 2 parameters).

P2010 = USS Baud rate.This must correspond to the Baud rate being used by the master.The maximum Baud rate supported is 57600 Baud.

P2011 = USS Node address.This is a unique slave address for the inverter.

Once these parameters have been set communication is possible. The master will be able to read andwrite parameters (PKW area) and also monitor the inverter status and actual frequency (PZD area).

P0700 = 4 or 5.This allows control of the inverter via USS.The meaning of the bits is explained in the section on “PZD area”.The normal RUN and OFF1 commands are 047F (hex) and 047E (hex) respectively.Other examples are given in the section on “PZD area”.

P1000 = 4 or 5.This allows the main setpoint to be sent via USS.By default this is normalized using P2000 so that 4000 (hex) = the value set in P2000.It is possible to normalize this differently using P2009 (level 3) for backwards compatibility with previous inverters.This will be explained in the next section "Advanced settings".

1RWHP0700 and P1000 are independent of each other and must be set separately asrequired

3.3.11 Common advanced settings

P1000 = x4 or x5.This allows an additional setpoint to be added to the main USS setpoint (see parameter description for P1000).

P1000 = 4x or 5x.This allows the USS setpoint to be used as an additional setpoint added to the main inverter setpoint (see parameter description for P1000).

The following parameters are only available in expert level (P0003 = 3).

P0003 = 3 allows access to expert parameters.

P2009 = USS normalization (compatibility).The setting 0 gives a frequency setpoint normalization using P2000.The setting 1 allows the setpoint to be sent as an absolute decimal value (e.g. 4000 dec = 0FA0 hex = 40.00 Hz) for backwards compatibility with previous MICROMASTER products. The actual value (HIW) in the reply telegram is also affected.

P2014 = USS telegram off time (ms).This allows the user to set a time after which the fault F070 is generated if no telegram is received.The default setting is 0 ms, which disables the timer.



3.3.12 Further advanced settings

The USS telegram can be customized for a particular application with the followingparameters (level 3 only).

P0003 = 3, allows access to expert parameters.

P2012 = USS PZD length.The normal PZD length is 2 words as described earlier.This parameter allows the user to choose a different length of PZD for control and monitoring purposes.For example a 3 word PZD would allow a second setpoint and actual value to be

used.The second actual value could be set for example as the inverter output current (P2016or P2019 index 3 =27).

P2013 = USS PKW length.By default this is set to 127 (variable).This means that the length of the PKW sent can be variable and also that the reply telegram length will be variable.This then affects the total length of the USS telegram.If writing a control program, it may be useful to have a constant length telegram so that, for example, the reply status word (ZSW) always occurs in the same position.For MICROMASTER 420 the most useful PKW fixed length is 4 words as this allows reading and writing of all parameters.

P2016andP2019:

These allow the user to define which status words and actual values are returned in thereply PZD telegram for RS232 and RS485 respectively.These are indexed parameters, which are set as follows:

Index 0 = status word 1 (ZSW) (default = 52 = inverter status word)Index 1 = actual value 1 (HIW) (default = 21 = output frequency)Index 2 = actual value 2(HIW2) (default = 0)Index 3 = status word 2 (ZSW2) (default = 0)

3.3.13 Compatibility with previous MICROMASTER products

There are limitations to the compatibility between MICROMASTER 420 USS andprevious MICROMASTER products.

3='&RQWURO:RUG

The meaning of bits 11 and 12 have changed.

In order to get the motor to run right with MICROMASTER 420, bit 11 should be 0(on MM3 it was 1).

To run left, bit 11 should be set to 1 (it was 0 on MM3 and bit 12 was 1).

i.e. The signal 047F(hex) will cause the inverter to run right and 0C7F(hex) willcause the inverter to run left.



Table 3-8 Comparison Table (MICROMASTER 420/Earlier MICROMASTER)

&RQWURO:RUG

00 00 00YDOXH

Bit 0 ON (Ramp-up)/ OFF1 (Ramp-down). Same as MM3.

Bit 1 OFF2: electrical stop. Same as MM3.

Bit 2 OFF3: Fast stop. Same as MM3.

Bit 3 Pulse enable. Same as MM3.

Bit 4 Ramp function Generator (RFG) enable. Same as MM3.

Bit 5 RFG start. Same as MM3

Bit 6 Setpoint enable Same as MM3.

Bit 7 Fault acknowledge. Same as MM3.

Bit 8 Jog right. Same as MM3.

Bit 9 Jog left. Same as MM3.

Bit 10 Control from PLC. Same as MM3.

Bit 11 Right direction. Setpoint inversion 0 run right.1 run left.

Bit 12 Left direction. Not used.

Bit 13 Not used. Not used.

Bit 14 Not used. Not used.

Bit 15 Not used Not used.

Using MICROMASTER 420 as a replacement for MM3 on an existing machine,setting P1820 = 1 (reverse output phase sequence) will allow the inverter to beoperated with the existing control word.

The frequency will be displayed as negative for clockwise rotation (RUN RIGHT) inthis case.

According to USS protocol, the functions of bits 11 to 15 are user defined. Thisbrings MICROMASTER 420 in line with all future Siemens products.

0DLQ6HWSRLQW

MM3 parameter P95 “USS Compatibility” setting can be achieved by settingP2009 = 1 (level 3, see previous section).

3.3.14 Reading and Writing Parameters

This is no longer compatible with previous MICROMASTER products. Apart fromdifferent parameter numbers, many of the parameter values now use IEEE floatformat, which necessitates the use double word parameter values and thusrequires a longer PKW part of the telegram. This brings MICROMASTER 420 inline with other Siemens inverters such as MasterDrive.

3.3.15 Broadcast Mode

MM3 operated with a 3 word PKW only. For this reason the PKW arearequirement for broadcast mode was not implemented and it was actually possibleto change parameter values on all slaves using a broadcast telegram.



3.3.16 Using BiCo with USS

The additional BiCo functionality can be used to achieve greater flexibility whencontrolling the inverter of USS. As was discussed earlier, the MICROMASTER 420can operate with a PZD length defined by the user in P2012. This means thateither one or two control words can be sent from the USS master.

If using a single control word (P2012 = default setting = 2), the meaning of thecontrol bits is fixed. However Bit 12 has no assigned function. This can beconnected to a function if the user wishes to do this.

([DPSOH

Using USS control with a single control word the user wishes to switch betweenslow and fast ramp times. This can be achieved by connecting Bit 12 of the controlword to the source of JOG ramp time selection (P1124)

3DUDPHWHUVHWWLQJV

P0003 = 3 user access level.P0700 = 5 control via RS485.P1060 = JOG ramp up time.P1061 = JOG ramp down time.P1120 = normal ramp up time.P1121 = normal ramp down time.P1124 = 2036.12 (connects bit 12 of RS485 control word).P2012 = 2 default setting.

With P2012 set to 4, a second control word is possible and the individual bits ofthis control word can be connected to the source of individual functions.

([DPSOH

If RS485 is being used Bit 9 of the second control word could be used to enableDC braking as follows:

P0003 = 3P0700 = 5P1230 = 2037.9P2012 = 4

1RWH:While none of the functions of the second control word are preconnected, werecommend using the following bits for the following functions as this correspondsto the description of the second control word displayed in r0056

Bit 0 Fixed frequency selection bit 0.Bit 1 Fixed frequency selection bit 1.Bit 2 Fixed frequency selection bit 2.Bit 8 PID release.Bit 9 Enable DC braking.Bit13 External fault.

The remaining bits can be connected as desired.



3.4 PROFIBUS

3.4.1 Overview

PROFIBUS is an open standard communication protocol which has been designedand developed for use in general industrial applications. The standard is defined inEN50170 (volume 2) and has been developed, agreed and adopted by manymanufacturers world-wide.

PROFIBUS control is now available for a wide variety of products, from manydifferent companies manufacturing drives, actuators, valves, as well asProgrammable Logic Controllers (PLCs) and other system controllers. PROFIBUSoperates over a variety of hardware interconnections such as fibre optics andRS485.

There are three versions of PROFIBUS: FMS, DP and PA and all these versionswill work together. The most commonly used version is the DP version, intendedfor general industrial applications. This is the version supported by SiemensDrives.

3.4.2 Using the PROFIBUS

In order to connect to a PROFIBUS system, a PROFIBUS module is required. Thismodule mounts on the front of the drive and uses the RS485 serial port tocommunicate with the drive.

A nine way ‘D type’ connector, which is a PROFIBUS standard, is incorporatedinto the bottom of the module.

The drive may be controlled and monitored via the main PROFIBUS system in asimilar way to the USS. The PROFIBUS protocol is more complex than the USSprotocol and control programmes are best developed using proprietary software.

Although a PROFIBUS system is more complex than for instance, the USSProtocol, it offers the following advantages:

• Open, clearly defined system.

• Many different products from many different manufacturers.

• Well proven in many industrial applications.

• Reduced wiring; easy set up re-programming, monitor and control.

• Very fast; up to 12Mbaud.

• Up to 125 slaves on one DP system.

• Single or Multi-master operation possible.

• One to one or broadcast communications.

• Support and development software available.



3.5 PROFIBUS Module

This option allows the MICROMASTER 420 to be controlled via a PROFIBUS-DPserial bus (SINEC L2-DP).

PROFIBUS-DP is a cost-effective high-speed serial communication systemoptimized for the actuator/sensor area where very short system reaction times arecritical. It operates as a decentralized I/O system whereby the traditional wiring tothe sensors and actuators is replaced by an RS485 serial bus system linking thestations together.

The suitability of the system for such applications has been recently enhanced bythe extension of the bus speed up to 12 MBd. The protocol is defined asDIN19245 and also as EN50170 guaranteeing open, multi-vendor communicationsbetween PROFIBUS-DP stations.

Up to 125 stations can be networked together using this single bus system and avery flexible data structure allows the system to be optimized to exactly match therequirements of each device.

PROFIBUS-DP lies at the heart of the new generation of SIMATIC S7 automationsystems offered by Siemens. Using this single bus system, all engineering,visualization and PLC control operations can be integrated. To configure aSIMATIC based automation system, all that is required is the associated STEP7configuration tool running on a PC. Bus configuration is performed by using a dragand drop technique in a graphically displayed PROFIBUS-DP network.

Some of the advantages of automating a system with PROFIBUS-DP are detailedin the following list:

• Only one single network for operator panels, drives, sensors, actuators,PLCs.

• Cost savings in installation time and cabling.

• Ease of commissioning with the SIMATIC S7 PLC system and STEP7software.

• Flexibility to expand or modify the automation system at a later date.

• Simple integration into higher level process visualization systems such asPCS7.

• Remote diagnostics reduce the down-time in the event of a problem.

3.5.1 Features of PROFIBUS Module

• Permits fast cyclic communications via a PROFIBUS connection.

• Supports all PROFIBUS baud rates up to 12 MBd.

• Control of up to 125 inverters using PROFIBUS-DP protocol (withrepeaters).

• Conforms with EN50170 guaranteeing open communications on a serialbus system. It can be used with other PROFIBUS-DP/SINEC L2-DPperipheral devices on the serial bus. Data format conforms to the VDI/VDEdirective 3689 “PROFIBUS Profile for Variable Speed Drives”.

• Acyclic communications channel for connecting SIMOVIS or other servicetools.

• Support for the PROFIBUS control commands SYNC and FREEZE.

• Can be easily configured using the S7 Manager software, or anyproprietary PROFIBUS commissioning tool.

• Simple integration into a SIMATIC S5 or S7 PLC system using speciallydesigned functional blocks (S5) and software modules (S7).



• Simply plugs into the front of the inverter.

• No separate power supply necessary.

• Digital and analogue inputs can be read and digital and analogue outputscontrolled via the serial bus.

• 5 mSec response time to process data.

• Output frequency (and therefore motor speed) can be controlled locally onthe drive or over the serial bus.

• Multi-mode operation possible, whereby control data can be input via theterminal block (digital inputs) and setpoint over the serial bus.Alternatively, the setpoint can be from a local source (analogue input) withthe drive control over the serial bus.

• All drive parameters are accessible over the serial link.

• The PROFIBUS module is a push fit into the front of the drive. The clip atthe bottom must be pulled down to release the module.

1RWHV

• PROFIBUS Module can only be inserted or removed from the drive whenthe drive is powered off.

• If the PROFIBUS Module is connected to the SUB-D socket on the frontpanel, then the internal RS 485 connections of the 6SE32 drive (terminals23 and 24) must not be used.

• PROFIBUS module must not be connected to the drive with a cable.

The data structure for communication over PROFIBUS-DP can be either PPO type1 or PPO type 3 as specified in VDI/VDE 3689. This means in practice thatprocess data (control words, setpoints in the transmitted telegram and statuswords, actual values in the received telegram) are always sent. Parameter dataexchange may, however, be blocked if bus bandwidth or PLC memory space is ata premium. The data structure, and thus the PPO type, is normally specified bythe bus master. If no PPO type is specified (e.g. if a combined PROFIBUSDP/PROFIBUS FMS bus master is used), the default PPO type is type 1(parameter data exchange enabled).

Process data from the serial link always has a higher priority than parameter data.This means that a setpoint change or drive control change command will beprocessed faster than a parameter change command.

Parameter write access over the serial link can be enabled or blocked as required.Parameter read access is permanently enabled, allowing continuous read-out ofdrive data, diagnostics, fault messages etc. A visualization system can thus berealized with minimal effort.

Local control of the drive with the On, Off, Jog and Reverse buttons is possible atall times in an identical fashion to when the module is not present.

The PROFIBUS cable is connected to the 9 way SUB-D socket on the front of thePROFIBUS Module.



Table 3-9 Assignment of the PROFIBUS SUB-D socket connector

7HUPLQDO )XQFWLRQLQIRUPDWLRQ

1 Not connected (NC)

2 NC

3 Send- and receive line RS 485, two wire, positivedifferential input/output B/P

4 Request to send (RTS)

6 5V isolated power supply for termination resistors

7 NC

8 Send and receive line, RS 485, two wire negativedifferential input/output A/N

9 NC

Table 3-10 Maximum Cable Lengths for Data Transfer Rates

'DWDWUDQVIHUUDWH.ELWV

0D[FDEOHOHQJWKRIDVHJPHQWP

9.6019.2093.75

187.50500.00500.00

12000.00

1200120012001000400200100

The shield of the cable must be connected to the housing of the SUB-D connector.

A segment can be extended by using RS485 repeaters.

Recommendation: SINEC L2 repeater RS485 (Order No.: 6ES7972-0AA00-0XA0).

For reliable operation of the serial bus system, the cable must be terminated atboth ends using terminating resistors. For operation at 12MBd, cables must beterminated in connectors with a built-in damping network. Additionally, for 12 MBdoperation, no stub length from the main bus cable is allowed.

Suitable SINEC-L2 DP connectors and cable for reliable operation up to 12 MBdare listed below in Table 2-13:

Table 3-11 Order Numbers for Connectors and Cables

2UGHU1XPEHU 'HVFULSWLRQ

6ES7 972-0BB10-0XA0 Bus Connector with PG interface

6ES7 972-0BA10-0XA0 Bus connector without PG interface

6XV1830-0AH10 Bus cable 20m-1000m

A floppy disk is supplied with the PROFIBUS module containing the handbook and2 data files for configuring the relevant PLC system.



4XLFN*XLGHWRVHWWLQJXS352),%86

• The bus cable between the master device and the drive must beconnected correctly. This includes the necessary termination resistors and(for 12 MBd) the terminating network.

• The bus cable must be screened and the screen must be connected to thehousing of the cable connector.

• The PROFIBUS master must be configured correctly so thatcommunications can be realized with a DP slave using PPO type 1 or PPOtype 3 (only PPO type 1, if the PPO type cannot be configured via remoteoperator control).

• When using COM ET software with a SIMATIC S5, the correct typedescription file must be used, so that an IM 308B/C can be configured asbus master. When using the Simatic Manager for an S7, the ObjectManager must be loaded.

• The bus must be operational (for a SIMATIC module, the operator controlpanel switch must be set to RUN).

• The bus baud rate must not exceed 12 MBd.

• The PROFIBUS Module must be correctly fitted to the inverter and theinverter must be powered up.

• The slave address for the drive (parameter P918) must be set so that itcorresponds to the slave address configured at the PROFIBUS master,and must be uniquely defined on the bus.

Installation should be in conformance with EMC directives and regulations (this isdescribed in detail in the operating manuals for the drive and the PLC).

Table 3-12 Technical data

,WHP 'HVFULSWLRQ

Dimensions H x W x D 115 mm x 102 mm x 30 mm

Degree of protection IP21

Maximum bus speed 12 MBd

Table 3-13 PROFIBUS Ordering information

'HVLJQDWLRQ 2UGHU1R

PROFIBUS module 6SE3290-0XX87-8PB0

Block package for SIMATIC S5 DVA_S5Supplied as 3.5” floppy disk

6DD1800-0SW0

Block package for SIMATIC S7 including DVA_S7 and DrivesObject Manager.Supplied as CD

6SX7005-0CB00

,QWHUQDWLRQDO(QJOLVK 237,216


4 Options

This Chapter contains brief details of all options associated with theMICROMASTER 420.

&RQWHQWV

4.1 Introduction ..............................................................................................................66

4.2 Variant Dependent Options .....................................................................................66

4.2.1 Filters .......................................................................................................................66

4.2.2 Chokes.....................................................................................................................67

4.2.3 Gland Plates ............................................................................................................68

4.2.4 Fuses .......................................................................................................................69

4.2.5 Circuit Breakers .......................................................................................................71

4.3 Variant Independent Options...................................................................................73

4.3.1 Basic Operator Panel (BOP) ...................................................................................73

4.3.2 Advanced Operating Panel (AOP) ..........................................................................73

4.3.3 PROFIBUS Module .................................................................................................74

4.3.4 PROFIBUS Cable Connector ..................................................................................74

4.3.5 PC to Inverter Connection Kit ..................................................................................74

4.3.6 BOP/AOP Door Mounting Kit for Single Inverter Control ........................................74

4.3.7 AOP Door Mounting Kit for Multiple Inverter Control...............................................74

)LJXUHV

Figure 4-1 Inverter with Filter. ................................................................................................................66

Figure 4-2 Inverter with Input Choke......................................................................................................67

Figure 4-3 Inverter with Output Choke...................................................................................................68

7DEOHV

Table 4-1 Recommended Fuses (230 V Single-phase)........................................................................69

Table 4-2 Recommended Fuses (230 V Three-phase) ........................................................................69

Table 4-3 Recommended Fuses (380 V – 480 V) ................................................................................70

Table 4-4 Recommended Circuit Breakers (230 V Single-phase) ........................................................71

Table 4-5 Recommended Circuit Breakers (230 V Three-phase).........................................................71

Table 4-6 Recommended Circuit Breakers 380 V – 480 V)..................................................................72

237,216 ,QWHUQDWLRQDO(QJOLVK


4.1 Introduction

Several options are available for use with Siemens Standard inverters. These areintended to assist product selection, installation and commissioning in certainapplications.

4.2 Variant Dependent Options

4.2.1 Filters

MICROMASTER 420 inverters are designed to minimize conducted and radiatedinterference. However, they are power electronic products and generate significantlevels of interference over a wide electromagnetic spectrum.

In many applications it is possible to operate without filters or with the built in filteronly. However, in order to achieve higher levels of attenuation an external filtermay be required. In particular, an external filter will be needed to meet residential,commercial and light industrial levels.

The purpose of RFI filters is to reduce the conducted levels of interference from theinverter to the supply. It is not intended to reduce radiated interference orattenuate interference into the inverter. The filter should be fitted to the mainsinput to the inverter and will be damaged if installed in the inverter output.

The filters are designed to mount underneath the inverter to minimize spacerequirements. Units are also available with built in filters.

Detailed installation drawings are contained in the CD-ROM supplied with theinverter.

Figure 4-1 Inverter with Filter.

MAINS INPUT

FILTERED OUTPUT

FILTER



4.2.2 Chokes

Chokes can be fitted to the input of the inverter to reduce harmonic distortion andto reduce the effect of supply disturbance on the inverter. Chokes are essentialwhere the supply impedance is less than 1%.

Chokes are fitted to the output of the inverter to allow operation with long cables.The choke compensates for the stray capacitance of the cables. Recommendedchokes for different cable lengths and inverters are available.

Detailed installation drawings are contained in the CD-ROM supplied with theinverter.

Figure 4-2 Inverter with Input Choke

L1L2

L3

MAINS INPUT

INPUT

CHOKE

OUTPUT



Figure 4-3 Inverter with Output Choke

4.2.3 Gland Plates

Gland plates are mechanical assemblies added to the inverters to assist theinstallation of screened power and control cables. Shielded connections of thepower and control cables ensure optimum EMC performance. Please refer to theCD-ROM supplied with the inverter for detailed installation drawings.

OUTPUT

CHOKE

MOTOR

CABLE

OUTPUT



4.2.4 Fuses

Table 4-1 Recommended Fuses (230 V Single-phase)

,QYHUWHU3RZHUN:

,QYHUWHU3RZHUKS

,QYHUWHU)LOWHU&ODVV

)UDPH6L]H

,QYHUWHU2UGHU1XPEHU0/)%

6WDQGDUG)XVHV

0.12 0.16 Unfiltered FS A 6SE6420-2UC11-2AA0 3NA3803





1.10 1.50 Unfiltered FS B 6SE6420-2UC21-1BA0 3NA3807



3.00 4.00 Unfiltered FS C 6SE6420-2UC23-0CA0 3NA3812

0.12 0.16 A FS A 6SE6420-2AB11-2AA0 3NA3803

0.25 0.33 A FS A 6SE6420-2AB12-5AA0 3NA3803

0.37 0.50 A FS A 6SE6420-2AB13-7AA0 3NA3803

0.55 0.75 A FS A 6SE6420-2AB15-5AA0 3NA3803

0.75 1.00 A FS A 6SE6420-2AB17-5AA0 3NA3805

1.10 1.50 A FS B 6SE6420-2AB21-1BA0 3NA3807

1.50 2.00 A FS B 6SE6420-2AB21-5BA0 3NA3807

2.20 3.00 A FS B 6SE6420-2AB22-2BA0 3NA3810

3.00 4.00 A FS C 6SE6420-2AB23-0CA0 3NA3812

Table 4-2 Recommended Fuses (230 V Three-phase)

,QYHUWHU3RZHUN:

,QYHUWHU3RZHUKS

,QYHUWHU)LOWHU&ODVV

)UDPH6L]H


6WDQGDUG)XVHV












3.00 4.00 A FS C 6SE6420-2AC23-0CA0 3NA3810

4.00 5.00 A FS C 6SE6420-2AC24-0CA0 3NA3812

5.50 7.50 A FS C 6SE6420-2AC25-5CA0 3NA3814



Table 4-3 Recommended Fuses (380 V – 480 V)

,QYHUWHU3RZHUN:

,QYHUWHU3RZHUKS

,QYHUWHU)LOWHU&ODVV

)UDPH6L]H


6WDQGDUG)XVHV

0.37 0.50 Unfiltered FS A 6SE6420-2UD13-7AA0 3NA3803





2.20 3.00 Unfiltered FS B 6SE6420-2UD22-2BA0 3NA3805



5.50 7.30 Unfiltered FS C 6SE6420-2UD25-5CA0 3NA3807



2.20 3.00 A FS B 6SE6420-2AD22-2BA0 3NA3805

3.00 4.00 A FS B 6SE6420-2AD23-0BA0 3NA3805

4.00 5.30 A FS B 6SE6420-2AD24-0BA0 3NA3807

5.50 7.30 A FS C 6SE6420-2AD25-5CA0 3NA3807

7.50 10.00 A FS C 6SE6420-2AD27-5CA0 3NA3810

11.00 15.00 A FS C 6SE6420-2AD31-1CA0 3NA3814



4.2.5 Circuit Breakers

Table 4-4 Recommended Circuit Breakers (230 V Single-phase)

,QYHUWHU3RZHUN:

,QYHUWHU3RZHUKS

,QYHUWHU)LOWHU&ODVV

)UDPH6L]H


0LQLDWXUH&LUFXLW%UHDNHUV

0.12 0.16 Unfiltered FS A 6SE6420-2UC11-2AA0 3RV1021-1CA10

0.25 0.33 Unfiltered FS A 6SE6420-2UC12-5AA0 3RV1021-1EA10

0.37 0.50 Unfiltered FS A 6SE6420-2UC13-7AA0 3RV1021-1FA10

0.55 0.75 Unfiltered FS A 6SE6420-2UC15-5AA0 3RV1021-1HA10

0.75 1.00 Unfiltered FS A 6SE6420-2UC17-5AA0 3RV1021-1JA10

1.10 1.50 Unfiltered FS B 6SE6420-2UC21-1BA0 3RV1021-1KA10

1.50 2.00 Unfiltered FS B 6SE6420-2UC21-5BA0 3RV1021-4AA10

2.20 3.00 Unfiltered FS B 6SE6420-2UC22-2BA0 3RV1021-4CA10

3.00 4.00 Unfiltered FS C 6SE6420-2UC23-0CA0 3RV1031-4EA10

0.12 0.16 A FS A 6SE6420-2AB11-2AA0 3RV1021-1CA10

0.25 0.33 A FS A 6SE6420-2AB12-5AA0 3RV1021-1EA10

0.37 0.50 A FS A 6SE6420-2AB13-7AA0 3RV1021-1FA10

0.55 0.75 A FS A 6SE6420-2AB15-5AA0 3RV1021-1HA10

0.75 1.00 A FS A 6SE6420-2AB17-5AA0 3RV1021-1JA10

1.10 1.50 A FS B 6SE6420-2AB21-1BA0 3RV1021-1KA10

1.50 2.00 A FS B 6SE6420-2AB21-5BA0 3RV1021-4AA10

2.20 3.00 A FS B 6SE6420-2AB22-2BA0 3RV1021-4CA10

3.00 4.00 A FS C 6SE6420-2AB23-0CA0 3RV1031-4EA10

Table 4-5 Recommended Circuit Breakers (230 V Three-phase)

,QYHUWHU3RZHUN:

,QYHUWHU3RZHUKS

,QYHUWHU)LOWHU&ODVV

)UDPH6L]H



0.12 0.16 Unfiltered FS A 6SE6420-2UC11-2AA0 3RV1021-1AA10

0.25 0.33 Unfiltered FS A 6SE6420-2UC12-5AA0 3RV1021-1CA10

0.37 0.50 Unfiltered FS A 6SE6420-2UC13-7AA0 3RV1021-1DA10

0.55 0.75 Unfiltered FS A 6SE6420-2UC15-5AA0 3RV1021-1FA10

0.75 1.00 Unfiltered FS A 6SE6420-2UC17-5AA0 3RV1021-1GA10

1.10 1.50 Unfiltered FS B 6SE6420-2UC21-1BA0 3RV1021-1HA10

1.50 2.00 Unfiltered FS B 6SE6420-2UC21-5BA0 3RV1021-1JA10

2.20 3.00 Unfiltered FS B 6SE6420-2UC22-2BA0 3RV1021-1KA10

3.00 4.00 Unfiltered FS C 6SE6420-2UC23-0CA0 3RV1021-4BA10

4.00 5.00 Unfiltered FS C 6SE6420-2UC24-0CA0 3RV1021-4CA10

5.50 7.50 Unfiltered FS C 6SE6420-2UC25-5CA0 3RV1031-4FA10

3.00 4.00 A FS C 6SE6420-2AC23-0CA0 3RV1021-4BA10

4.00 5.00 A FS C 6SE6420-2AC24-0CA0 3RV1021-4CA10

5.50 7.50 A FS C 6SE6420-2AC25-5CA0 3RV1031-4FA10



Table 4-6 Recommended Circuit Breakers 380 V – 480 V)

,QYHUWHU3RZHUN:

,QYHUWHU3RZHUKS

,QYHUWHU)LOWHU&ODVV

)UDPH6L]H



0.37 0.50 Unfiltered FS A 6SE6420-2UD13-7AA0 3RV1021-1DA10

0.55 0.75 Unfiltered FS A 6SE6420-2UD15-5AA0 3RV1021-1EA10

0.75 1.00 Unfiltered FS A 6SE6420-2UD17-5AA0 3RV1021-1FA10

1.10 1.50 Unfiltered FS A 6SE6420-2UD21-1AA0 3RV1021-1GA10

1.50 2.00 Unfiltered FS A 6SE6420-2UD21-5AA0 3RV1021-1HA10

2.20 3.00 Unfiltered FS B 6SE6420-2UD22-2BA0 3RV1021-1HJ10

3.00 4.00 Unfiltered FS B 6SE6420-2UD23-0BA0 3RV1021-4AA10

4.00 5.30 Unfiltered FS B 6SE6420-2UD24-0BA0 3RV1021-4AA10

5.50 7.30 Unfiltered FS C 6SE6420-2UD25-5CA0 3RV1021-4BA10

7.50 10.00 Unfiltered FS C 6SE6420-2UD27-5CA0 3RV1021-4DA10

11.00 15.00 Unfiltered FS C 6SE6420-2UD31-1CA0 3RV1031-4EA10

2.20 3.00 A FS B 6SE6420-2AD22-2BA0 3RV1021-1HA10

3.00 4.00 A FS B 6SE6420-2AD23-0BA0 3RV1021-1KA10

4.00 5.30 A FS B 6SE6420-2AD24-0BA0 3RV1021-1KA10

5.50 7.30 A FS C 6SE6420-2AD25-5CA0 3RV1021-4AA10

7.50 10.00 A FS C 6SE6420-2AD27-5CA0 3RV1021-4BA10

11.00 15.00 A FS C 6SE6420-2AD31-1CA0 3RV1031-4FA10



4.3 Variant Independent Options

For more details of the following options, please refer to the CD-ROM supplied withthe inverter.

4.3.1 Basic Operator Panel (BOP)

The BOP can be used for setting individual parameters. Values and units areshown on a clear 5-digit display. It may be used for several inverters. Please seeAppendix A in the Operating Instructions for the method of changing the Operatorpanel.

The BOP may be directly mounted on the inverter or on a cabinet door using asuitable mounting kit. (See paragraph 4.3.6. on Page 74)

4.3.2 Advanced Operating Panel (AOP)

The Advanced Operator Panel (AOP) enhances the interface/communicationcapability of the MICROMASTER range of frequency inverters. Available in eitherInverter, Desk or Panel mounted form. The unit provides the user with anintelligent, clear text inverter interface. This gives direct access to the control,programming, storage and monitoring of MICROMASTER series operatingparameters.

For local control of individual inverters the AOP is mounted directly onto theinverter fascia. Alternatively the unit can operate remote from the inverter (singleor multi-drop) within either a Desk or Panel mounted support platform. When usedas the master inverter on a dedicated system bus (multi-drop) the AOP has thecapacity to communicate with up to 31 inverters. Each inverter is allocated a slaveaddress and full operator control is possible throughout. In this mode the AOP canbe used as a PC management tool to permit network control with ‘SIMOVIS’software.

Each unit supports software capable of carrying out configuration and storage ofinverter parameter sets. Software menus, inverter parameters, associated valuesand help text is displayed on a compact dot matrix LCD screen. Operatorcommands for software are derived from a keypad located directly below the LCDscreen. Communication with dependent inverters in single or multi-dropconfiguration is achieved via RS232 or RS485 interface terminals.

The clear text operating panel consists of a control and display unit that fits directlyon top of the MICROMASTER 420. A D-Type socket connects directly onto the D-type on the front of the unit, so the AOP can take power from and communicatewith the inverter via the RS485 interface. The AOP offers the following features:

6XPPDU\

The AOP has several practical uses. For example:

• The AOP may be mounted directly onto the inverter and used to control theinverter directly.

• The AOP can be mounted on a separate panel (using an optional cable ofup to 5 m) to enable remote control and monitoring of the inverter.

• If an external power supply is connected to the AOP, remote control overdistances greater than 5 m is permissible.

• The built in RS232 to RS485 connector can be used to allowcommunication between a PC and the inverter.

• Parameter sets can be stored in the AOP and uploaded or downloaded asrequired. This is particularly useful where many inverters requireprogramming in production.



4.3.3 PROFIBUS Module

The PROFIBUS module allows full PROFIBUS connection of up to 12 Mbaud. Youcan supply the module from an external 24 V supply which keeps PROFIBUSactive even when the inverter is removed from its power. The module permits fullremote control of PROFIBUS or local control or a mixture of both. Connection tothe module is made using a 9-way sub D-Type connector.

4.3.4 PROFIBUS Cable Connector

When the PROFIBUS module is fitted to the inverter, the RS485 interface is notavailable. The RS232 interface may, however, continue to be used for BOP orAOP connection.

4.3.5 PC to Inverter Connection Kit

The PC to Inverter Connection Kit is used for controlling an inverter directly from aPC provided the correct software has been installed (Refer to Chapter 3Communications). The hardware includes an opto-isolated RS232 adapter boardfor reliable point-to-point connection.

The RS485 interface remains available for other uses.

4.3.6 BOP/AOP Door Mounting Kit for Single Inverter Control

This kit is used to mount an operator panel in a cabinet door. The kit contains acable adapter board with screwless terminals for use with your own cables.

This kit extends the existing RS232 interface, bringing connections and power fromthe interface connector to terminals, which can then be wired to the AOP or BOPmounted in the door. Although RS232 should be limited to 3 m of cable, up to20 m of cable can operate satisfactorily, but this is not guaranteed.

The RS485 interface remains available for other uses.

4.3.7 AOP Door Mounting Kit for Multiple Inverter Control

The AOP can communicate with several inverters by means of the RS485 USSprotocol. This kit allows connection to these inverters through a control cabinetdoor.

In this installation, the AOP connects to the RS485 interface on the inverter, andalso takes 24 V power from the unit. If further inverters are connected, they can be‘daisy chained’ using the RS485 terminals on each inverter. The AOP can thencommunicate with all inverters using the RS485.

RS485 connections can operate over long distances, typically several hundredmetres, but the connection from the AOP to the first inverter includes the supply, sothis should be limited to 25 m.

An isolated RS232 interface is also provided on the kit which allowscommunication between the AOP and a computer for example. In this case theRS485 is fully utilized; the RS232 interface on the inverter can then be used by asecond BOP or AOP if required.

,QWHUQDWLRQDO(QJOLVK 7528%/(6+227,1*


5 Troubleshooting

This chapter contains an explanation of troubleshooting with the Status DisplayPanel.

&RQWHQWV

5.1 Troubleshooting with Status Display Panel .............................................................76

5.2 MICROMASTER 420 Fault Codes ..........................................................................76

7DEOHV

Table 5-1 Inverter conditions indicated by the LEDs on the SDP .........................................................76

7528%/(6+227,1* ,QWHUQDWLRQDO(QJOLVK


:DUQLQJV

• Repairs on equipment may only be carried out by 6LHPHQV6HUYLFH, byrepair centers DXWKRUL]HGE\6LHPHQV or by qualified personnel whoare thoroughly acquainted with all the warnings and operatingprocedures contained in this manual.

• Any defective parts or components must be replaced using partscontained in the relevant spare parts list.

• Disconnect the power supply before opening the equipment for access.

5.1 Troubleshooting with Status Display Panel

Table 5-1 explains the meaning of the various states of the LEDs on the StatusDisplay Panel (SDP).

Table 5-1 Inverter conditions indicated by the LEDs on the SDP

/('V3ULRULW\'LVSOD\

,QYHUWHU6WDWXV'HILQLWLRQV

*UHHQ <HOORZ

OFF OFF 1 Mains not present.

OFF ON 8 Inverter fault – other than those listed below.

ON OFF 13 Inverter running.

ON ON 14 Ready to run – standby.

OFF Flashing – R1 4 Fault – Overcurrent.

Flashing – R1 OFF 5 Fault – Overvoltage.

Flashing – R1 ON 7 Fault – Motor Overtemperature.

ON Flashing – R1 8 Fault – Inverter Overtemperature.

Flashing – R1 Flashing – R1 9 Warning Current Limit (both LEDs flashing at thesame time).

Flashing – R1 Flashing – R1 11 Other warning (both LEDs alternate flashing).

Flashing – R1 Flashing – R2 6/10 Undervoltage trip/Undervoltage warning.

Flashing – R2 Flashing – R1 12 Inverter is not in ready state – display >0.

Flashing – R2 Flashing – R2 2 ROM failure (both LEDs flashing at the sametime).

Flashing – R2 Flashing – R2 3 RAM failure (both LEDs alternate flashing).

5±2QWLPHPLOOLVHFRQGV 5±2QWLPHPLOOLVHFRQGV

5.2 MICROMASTER 420 Fault Codes

In the event of a failure, the inverter switches off and a fault code appears on thedisplay. See Operating Instructions, Chapter 6, Troubleshooting for an explanationof these codes.

,QWHUQDWLRQDO(QJOLVK 0$,17(1$1&(


6 Maintenance

This chapter contains an illustration showing the method of removing the fan fromthe inverter.

&RQWHQWV

6.1 Maintenance ............................................................................................................78

)LJXUHV

Figure 6-1 Fan Removal ........................................................................................................................78

0$,17(1$1&( ,QWHUQDWLRQDO(QJOLVK


6.1 Maintenance

The MICROMASTER 420 itself has no user serviceable components. However,after prolonged use, the fan mounted on the bottom of the inverter may becomeunserviceable. In this case, the fan can easily be removed and exchanged. Thefaulty fan should be disposed of according to local regulations. Figure 6-1illustrates the method of removal.

Figure 6-1 Fan Removal

1

2

3

,QWHUQDWLRQDO(QJOLVK $33(1',;$


A Applicable Standards

This Appendix contains a brief explanation of the standards used in the design ofMICROMASTER 420.

$33(1',;$ ,QWHUQDWLRQDO(QJOLVK


/RZ9ROWDJH'LUHFWLYH

European Low Voltage

The MICROMASTER product range complies with the requirementsof the Low Voltage Directive 73/23/EEC as amended by Directive98/68/EEC. The units are certified for compliance with the followingstandards:

EN 60146-1-1 Semiconductor inverters - General requirements and line commutated inverters.

EN 60204-1 Safety of machinery - Electrical equipment of machines.

(XURSHDQ0DFKLQHU\'LUHFWLYH

European Machinery Directive

The MICROMASTER inverter series does not fall under the scope ofthe Machinery Directive. However, the products have been fullyevaluated for compliance with the essential Health & Safetyrequirements of the directive when used in a typical machineapplication. A Declaration of Incorporation is available on request.

(XURSHDQ(0&'LUHFWLYH

European EMC Directive

When installed according to the recommendations described in thismanual, the MICROMASTER fulfils all requirements of the EMCDirective as defined by the EMC Product Standard for Power InverterSystems EN61800-3.

8QGHUZULWHUV/DERUDWRULHV

Underwriters Laboratories

UL and CUL LISTED POWER CONVERSION EQUIPMENT 5B33 foruse in a pollution degree 2.

,62

ISO 9001

Siemens plc operates a quality management system which complieswith the requirements of ISO 9001.

,QWHUQDWLRQDO(QJOLVK ,1'(;


,QGH[

$

Acoustic Noisetest results 35

AOPdetails 73

%

BiCocross connections 31operation 28using control words 30using status words 30with USS 59worked examples 28

Binary ConnectorsBiCo 28

Boost 11BOP 73Braking 20

compound 21dc 20normal 20Vdc max controller 21

&

Circuit Breakersrecommended 71

Closed Loopcontrol 12implementation 12setting up 12

CompatibilityMICROMASTER 420/MM3 2USS 57

Connectionsmulti-motor 27

Control Modesflux current 27linear V/f 27multi-point V/f 27quadratic V/f 27

Cubicle Calculations 26Current Limit

parameter interaction 8parameters controlling 8

Current Monitoringaccuracy 9

'

Deratingautomatic 26for sideways installation 25with altitude 24with single phase input 25with switching frequency 24with temperature 22

DifferencesMICROMASTER 420/MM3 3

)

Fan Removal 78Fuses

recommended 69

+

Harmonic Currentstables 36

/

Long Cablesoperation 22

2

Optionsoutput chokes 68suppression filters (RFI) 66

Order Numberscircuit breakers 71fuses 69PROFIBUS 63

3

PI Controllerlimits 18responses 14

Power Lossesoutput graphs 38

PROFIBUSadvantages & features 61cable lengths 63characteristics 60connections 63order numbers 63setting up 64

Protection Characteristicsfast current limit 9overtemperature 10overvoltage and trip 11thermal 26using PTC resistors 10

,1'(; ,QWHUQDWLRQDO(QJOLVK


5

Related DocumentationAppendix C 82order numbers ii

RS232 41RS485 41

troubleshooting 42

6

Serial Communicationsan introduction 41

Status Display PanelLED status definition 76

8

Unearthed Suppliesoperation 27

Universal Serial Interface Protocol 43USS 43

compatibility 57defined reply ID 47defined tasks 47detailed description 43parameter types 48PKW 49PZD 51reply telegram 53setting up 56task telegram 52telegram structure 43useful data characters 44


6XJJHVWLRQVDQGRU&RUUHFWLRQV

To:Technical Documentation Manager

Siemens Automation & Inverters

6XJJHVWLRQV

&RUUHFWLRQV

Siemens plc

Automation & Inverters

Varey Road, Congleton, CW12 1PH

For Publication/Manual:

MICROMASTER 420

Fax: +44 (0)1260 283603

Email: [email protected]

)URP

Name:

Reference Manual

Issue: A1

Company/Service Department

Address:

Telephone: __________ /

Telefax: ________ /

Should you come across any printingerrors when reading this publication,please notify us on this sheet.

Suggestions for improvement are alsowelcome.


,QWHUQDWLRQDO(QJOLVK 9LHZRI8QLWV


9LHZRI8QLW )UDPH6L]H$ )UDPH6L]H%&

StandardDisplayPanel fitted

PowerTerminalConnections

ControlTerminalConnections

Access to “YCap“


Date post:	27-Mar-2020
Category:	Documents
Upload:	others
View:	2 times
Download:	0 times

Reference Manual neu - RS Components · The MICROMASTER 420 (6SE64) is designed to replace the MM3...

Documents