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inverter systems for independent

power supply

2

General

The requirement for power supplyreliability is growing, due to theincreasing application of informationand data carrier systems, text proces-

sing, automated production processesand complex data networks.

Static inverters are being installedincreasingly by supply users whorequire AC voltages unaffected byinterference on the mains e.g.

Data processing installations

Process control computers

Air safety installations

Signalling, alarm systems

Telecommunicationsinstallations

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Irregularities due to loading of thepublic power supply by major users,peak-time use or by lightning strikescannot be avoided.

They result in:Mains voltage breaks, spikes andtransients. (Fig. 1)

Manufacture of the staticinverter production families

Single-Phase Inverter Series WPE Three-Phase Inverter Series WPD

The regulation characteristics of this

range of inverters results in very smallvoltage deviations, even with loadchanges of one hundred percent.

Both series are manufactured usingtransistor technology and have anelectronic bypass (EUE) and a built-inservice bypass switch.

The function and warning LEDs are onthe front control panel, together with amimic diagram.

The inverters are designed for conti-nuous inverter operation as well as forstand-by operation.

Control and monitoring of the inverterand EUE functions is carried out via amicroprocessor.

Function

InverterThe DC voltage is converted into AC inthe inverter using sine-wave optimi-sed pulse width regulation. Due to therelatively high switching frequencycompared to the basic frequency andthe optimised regulation of the pulsewidth a low distortion factor is achie-ved at low filtering expense. This againcontributes to good dynamic behaviourunder load changes.

In the event of mains interruption orfailure, the battery connected to theDC input is brought in automatically

and without interruption to supply cur-rent. If the battery becomes dischar-ged this is reported. If the batterydischarge limit is exeeded, the instal-lation automatically turns off and awarning is given shortly before thedischarged voltagelimit is reached.

Automatic change-over of the load tothe bypass mains or a suitable spareinstallation occurs if the supply fromthe inverter falls outside the presettolerances.

The EUE component of the installationfacilitates uninterrupted change-overto direct mains supply (bypass mains),keeping the specified tolerances. Thechange-over can be initiated manuallyor automatically by a control signal.

The P monitoring is autonomous andprevents incorrect operation of theinstallation and any illogical switchingfunctions of the EUE electronic bypass.

Thus, for example, an uninterruptedchange-over, whether automatic ormanual, is only possible when the vol-tage, frequency and phase conditionsof the inverter are synchronised withthe bypass mains. Mains frequencydeviations, which lie outside the presettolerances cause blocking of thechange-over, or if the inverter fails, achange-over with an interruption.

A change back can only occur to afunctioning inverter, and is in everycase uninterrupted even if the mainsshould fail on a test change-over.

3

Possible types of mains interference

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Inverter powersection

Main components Input filter Inverter bridge with transistors Output transformer with galvanic

isolation Output filter Quartz timer Synchronising circuit

Protection devices Protection devices for control and

auxiliary current circuits Electronic output current limiting Electronic transistor current limiting Temperature monitoring of

semiconductors Functional monitoring Overvoltage monitoring with inverter

off (output) Undervoltage monitoring with

inverter off (input)

Electronic bypasspower section

Main components Electronic switch in inverter output Electronic switch in the mains

bypass

Electronic control

Protective devices Semiconductor protection for the

mains branch Change-over blocking if mains not

present Blocking of repeated short term

change-overs Change-over blocking on non-syn-

chronised mains and intact inverter

Potential-free contacts wiredto terminals

2 change-overs, contact loading 6 A

Inverter operation Mains operation Battery discharging EUE fault Mains interference Inverter fault

Manual change-over(bypass switch)

A manual change-over switch is builtinto the equipment to permit switchingas required for servicing purposes.

Instruments and operatingindicators

Instruments WPE Voltmeter for the inverter output

voltage Ammeter for the inverter ouput

current Frequency meter for the inverter

output frequency

Mimic diagram with intergated opti-cal indicators DC voltage present Inverter operation Inverter voltage correct Inverter on load Bypass on load

Bypass mains present Automatic operating mode Manual change-over operating mode Electronic switch ready Lamp test button

Digital test system WPD Mains feed bypass:

Voltage per phase, frequency Inverter input circuit:

Voltage, inverter current drain

Inverter output: Voltage per phase,current per phase, frequency,loading indicator in percent and bar-graph per phase and total maximumbattery current storage per phase.

Single-Phase Inverter

(Interior view)

44

Mimic diagram with operating indicators

Mimic diagram with digital test system

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Technical data WPE WPD

Nom. power at cos phi 0.8: see type table see type table

Inverter input

Input voltage: 110 V, 220 V 48 V, 60 V,110 V, 220 V

Input voltage range: -15 to +20 % -15 to +20 % (at 60 V -10 to +20 %)

Permitted overlaid AC: < 5 % eff. < 5 % eff.Effect of inverter current on DC rails: < 10 % eff. < 10 % eff.

Switch-on current: < I-nom < I-nom

Current drain at cos. phi 0.8: see type table see type table

Inverter output

Output voltage: 230 V, N, PE 400/230 V, 3-ph., N, PE

Adjustment range of ouput voltage: 5 % 5 %

Voltage tolerance

Static: 1 % 1 %

Dynamic: 4 % for 100 % load change 4 % for 100 % load change

Asymmetrical load: 2 % for 100 % off-centre loadRegulation time: 25 msec 25 msec

Nominal ouput current: see type table see type table

Non-linear load: crest factor < 3 to 80 % of nom. load crest factor < 3 to 80 % of nom. load

Motor load: 100 % permitted (note starting current) 100 % permitted(note starting current)

Overload behaviour: 50 % for 60 sec., 25 % for 10 min., 50 % for 60 sec., 25 % for 10 min.,

10 % for 20 min. 10 % for 20 min.

Short-circuit behaviour: short-circuit proof, short-circuit proof,

short circuit current 2 x I-nom. for 5 sec. short circuit current 2 x I-nom. for 5 sec.

Output frequency: 50 Hz (60 Hz) 0,1 % quartz or mains 50 Hz (60 Hz) 0,1 % quartz or mains

synchronised synchronised

Synchronisation range: 50 Hz (60 Hz) 3 % 50 Hz (60 Hz) 3 %

Wave-form: sine wave sine wave

Distortion factor: < 3 % with linear load < 3 % with linear load

Radio interference grade: inverter side N, DC side G inverter N, DC side G

to VDE 0875 to VDE 0875

Permitted power factor: 0,0 ind. - 0,0 cap., 0,0 ind. - 0,0 cap.,

for deviations of cos phi 0,8 ind. for deviations of cos phi 0,8 ind.

power reduction power reduction

Noise level: ca. 38 - 70 dB (A) power dependent ca. 38 - 70 dB (A) power dependent

Permitted ambient temp.: 0 to 40 C 0 to 40 C

Permitted climatic data: temperate climate temperate climate

Humidity class: DIN 40040, Class F DIN 40040, Class F

Permitted installation

height at nominal load: 1000 m above sea level 1000 m above sea level

Type of protection: IP 20 to DIN 40050 IP 20 to DIN 40050

Paint finish: RAL 7032, structural paint RAL 7032, structural paint

Type of cooling: AN natural cooling or AN natural cooling or

AF forced air self cooling AF forced air self cooling

(according to output power) (according to output power)Efficiency at nom. load: see type table see type table

Instrumentation: V / A / Hz at output digital test system

Cabinet dimensions: see type table see type table

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110

48

Table of types WPE

InputVoltage

[V]

Currentdrain *

[A]

Outputpower[kVA]

Ouputvoltage

[V]

Ouputcurrent

[A]

Efficiency

[%]

DimensionsH x B x T

[mm]

Weight

[kg]

Equipment type

110 41,0 5 230 21,7 88,5 1500 x 600 x 600 250 G 110 E 230 / 21,7 / 2 rfg - WPE 5110 61,0 7,5 230 32,6 89,0 2000 x 800 x 800 280 G 110 E 230 / 32,6 / 2 rfg - WPE 7,5110 81,5 10 230 43,4 89,5 2000 x 800 x 800 350 G 110 E 230 / 43,4 / 2 rfg - WPE 10110 121,0 15 230 65,2 90,0 2000 x 1000 x 800 525 G 110 E 230 / 65,2 / 2 rfg - WPE 15110 160,5 20 230 86,8 90,0 2000 x 1000 x 800 670 G 110 E 230 / 86,8 / 2 rfg - WPE 20110 201,0 25 230 108,0 90,5 2000 x 1000 x 800 730 G 110 E 230 /108,0 / 2 rfg - WPE 25110 241,0 30 230 130,0 90,5 2000 x 1000 x 800 800 G 110 E 230 /130,0 / 2 rfg - WPE 30110 320,0 40 230 174,0 90,5 2000 x 1200 x 800 890 G 110 E 230 /174,0 / 2 rfg - WPE 40110 400,0 50 230 217,0 91,0 2000 x 1200 x 800 1010 G 110 E 230 /217,0 / 2 rfg - WPE 50110 480,0 60 230 261,0 91,0 2000 x 1200 x 800 1120 G 110 E 230 /261,0 / 2 rfg - WPE 60220 20,5 5 230 21,7 89,5 1500 x 600 x 600 250 G 220 E 230 / 21,7 / 2 rfg - WPE 5220 30,0 7,5 230 32,6 91,0 1500 x 600 x 600 280 G 220 E 230 / 32,6 / 2 rfg - WPE 7,5220 40,0 10 230 43,4 91,5 2000 x 600 x 600 350 G 220 E 230 / 43,4 / 2 rfg - WPE 10220 59,0 15 230 65,2 92,0 2000 x 800 x 800 400 G 220 E 230 / 65,2 / 2 rfg - WPE 15220 79,0 20 230 86,8 92,0 2000 x 800 x 800 440 G 220 E 230 / 86,8 / 2 rfg - WPE 20220 98,0 25 230 108,0 92,5 2000 x 800 x 800 475 G 220 E 230 /108,0 / 2 rfg - WPE 25220 118,0 30 230 130,0 92,5 2000 x 1000 x 800 520 G 220 E 230 /130,0 / 2 rfg - WPE 30220 157,0 40 230 174,0 92,7 2000 x 1000 x 800 650 G 220 E 230 /174,0 / 2 rfg - WPE 40220 196,0 50 230 217,0 92,8 2000 x 1200 x 800 760 G 220 E 230 /217,0 / 2 rfg - WPE 50220 236,0 60 230 261,0 92,8 2000 x 1200 x 800 870 G 220 E 230 /261,0 / 2 rfg - WPE 60220 276,0 70 230 304,0 92,8 2000 x 1200 x 800 990 G 220 E 230 /304,0 / 2 rfg - WPE 70220 314,0 80 230 348,0 92,9 2000 x 1600 x 800 1100 G 220 E 230 /348,0 / 2 rfg - WPE 80220 352,0 90 230 391,0 93,0 2000 x 1600 x 800 1220 G 220 E 230 /391,0 / 2 rfg - WPE 90220 390,0 100 230 434,0 93,0 2000 x 1600 x 800 1350 G 220 E 230 /434,0 / 2 rfg - WPE 100

Table of types WPD48 97,0 5 3 x 400 7,2 86,0 1500 x 600 x 600 330 G 48 D 400 / 7,2 / 2 rfg - WPD 548 145,0 7,5 3 x 400 10,8 86,0 2000 x 800 x 800 400 G 48 D 400 / 10,8 / 2 rfg - WPD 7,548 192,0 10 3 x 400 14,5 86,5 2000 x 800 x 800 500 G 48 D 400 / 14,5 / 2 rfg - WPD 1048 287,0 15 3 x 400 21,6 86,5 2000 x 800 x 800 650 G 48 D 400 / 21,6 / 2 rfg - WPD 1548 380,0 20 3 x 400 29,0 86,5 2000 x 1000 x 800 790 G 48 D 400 / 29,0 / 2 rfg - WPD 2048 476,0 25 3 x 400 36,2 87,0 2000 x 1000 x 800 850 G 48 D 400 / 36,2 / 2 rfg - WPD 2548 572,0 30 3 x 400 43,3 87,0 2000 x 1200 x 800 950 G 48 D 400 / 43,3 / 2 rfg - WPD 3060 77,0 5 3 x 400 7,2 86,5 1500 x 600 x 600 330 G 60 D 400 / 7,2 / 2 rfg - WPD 5

60 116,0 7,5 3 x 400 10,8 86,5 2000 x 800 x 800 400 G 60 D 400 / 10,8 / 2 rfg - WPD 7,560 153,0 10 3 x 400 14,5 87,0 2000 x 800 x 800 500 G 60 D 400 / 14,5 / 2 rfg - WPD 1060 230,0 15 3 x 400 21,6 87,0 2000 x 1000 x 800 650 G 60 D 400 / 21,6 / 2 rfg - WPD 1560 304,0 20 3 x 400 29,0 87,0 2000 x 1000 x 800 790 G 60 D 400 / 29,0 / 2 rfg - WPD 2060 381,0 25 3 x 400 36,2 87,5 2000 x 1000 x 800 850 G 60 D 400 / 36,2 / 2 rfg - WPD 2560 457,0 30 3 x 400 43,3 87,5 2000 x 1200 x 800 940 G 60 D 400 / 43,3 / 2 rfg - WPD 3060 610,0 40 3 x 400 57,8 87,5 2000 x 1200 x 800 980 G 60 D 400 / 57,8 / 2 rfg - WPD 4060 763,0 50 3 x 400 72,3 87,5 2000 x 1200 x 800 1090 G 60 D 400 / 72,3 / 2 rfg - WPD 50

110 41,0 5 3 x 400 7,2 88,5 1500 x 600 x 600 420 G 110 D 400 / 7,2 / 2 rfg - WPD 5110 61,0 7,5 3 x 400 10,8 89,0 2000 x 800 x 800 450 G 110 D 400 / 10,8 / 2 rfg - WPD 7,5110 81,5 10 3 x 400 14,5 89,5 2000 x 800 x 800 470 G 110 D 400 / 14,5 / 2 rfg - WPD 10110 121,0 15 3 x 400 21,6 90,0 2000 x 1000 x 800 540 G 110 D 400 / 21,6 / 2 rfg - WPD 15110 160,5 20 3 x 400 29,0 90,0 2000 x 1000 x 800 700 G 110 D 400 / 29,0 / 2 rfg - WPD 20110 201,0 25 3 x 400 36,2 90,5 2000 x 1000 x 800 820 G 110 D 400 / 36,2 / 2 rfg - WPD 25110 241,0 30 3 x 400 43,3 90,5 2000 x 1200 x 800 870 G 110 D 400 / 43,3 / 2 rfg - WPD 30110 321,0 40 3 x 400 57,8 90,7 2000 x 1200 x 800 950 G 110 D 400 / 57,8 / 2 rfg - WPD 40

110 400,0 50 3 x 400 72,2 90,8 2000 x 1200 x 800 980 G 110 D 400 / 72,2 / 2 rfg - WPD 50110 480,0 60 3 x 400 86,7 91,0 2000 x 1600 x 800 1020 G 110 D 400 / 86,7 / 2 rfg - WPD 60110 561,0 70 3 x 400 101,5 91,0 2000 x 1600 x 800 1090 G 110 D 400 / 101,5 / 2 rfg - WPD 70110 642,0 80 3 x 400 115,6 91,0 2000 x 1600 x 800 1200 G 110 D 400 / 115,6 / 2 rfg - WPD 80110 723,0 90 3 x 400 130,0 91,5 2000 x 1600 x 800 1285 G 110 D 400 / 130,0 / 2 rfg - WPD 90110 800,0 100 3 x 400 144,5 91,5 2000 x 1600 x 800 1350 G 110 D 400 / 144,5 / 2 rfg - WPD 100220 20,5 5 3 x 400 7,2 89,5 1500 x 600 x 600 320 G 220 D 400 / 7,2 / 2 rfg - WPD 5220 30,0 7,5 3 x 400 10,8 91,0 1500 x 600 x 600 360 G 220 D 400 / 10,8 / 2 rfg - WPD 7,5220 40,0 10 3 x 400 14,5 91,5 1500 x 600 x 600 410 G 220 D 400 / 14,5 / 2 rfg - WPD 10220 59,0 15 3 x 400 21,6 92,0 2000 x 800 x 800 460 G 220 D 400 / 21,6 / 2 rfg - WPD 15220 79,0 20 3 x 400 29,0 92,0 2000 x 800 x 800 480 G 220 D 400 / 29,0 / 2 rfg - WPD 20220 98,0 25 3 x 400 36,2 92,5 2000 x 1000 x 800 500 G 220 D 400 / 36,2 / 2 rfg - WPD 25220 118,0 30 3 x 400 43,3 92,5 2000 x 1000 x 800 605 G 220 D 400 / 43,3 / 2 rfg - WPD 30220 157,0 40 3 x 400 57,8 92,7 2000 x 1000 x 800 700 G 220 D 400 / 57,8 / 2 rfg - WPD 40220 196,0 50 3 x 400 72,2 92,8 2000 x 1000 x 800 780 G 220 D 400 / 72,2 / 2 rfg - WPD 50220 235,0 60 3 x 400 86,7 93,0 2000 x 1200 x 800 850 G 220 D 400 / 86,7 / 2 rfg - WPD 60

220 274,0 70 3 x 400 101,5 93,0 2000 x 1200 x 800 1050 G 220 D 400 /101,5 / 2 rfg - WPD 70220 313,0 80 3 x 400 115,6 93,0 2000 x 1200 x 800 1100 G 220 D 400 /115,6 / 2 rfg - WPD 80220 391,0 100 3 x 400 144,5 93,0 2000 x 1600 x 800 1200 G 220 D 400 /144,5 / 2 rfg - WPD 100220 470,0 120 3 x 400 173,4 93,0 2000 x 1600 x 800 1350 G 220 D 400 /173,4 / 2 rfg - WPD 120220 625,0 160 3 x 400 231,0 93,0 2000 x 1600 x 800 1500 G 220 D 400 /231,0 / 2 rfg - WPD 160

*Current drain refers to a load with cos phi of 0,8 and to nominal input voltage. Rights on technical changes reserved.

220

60

110

220

46

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Single-phase inverter

Inverter installation 2 x 40 kVA half load parallel operation

Three-phase inverter

Double door above 1200 mm width

Illustration of Dimensions

Ring bolt M16 DIN 580

62

H

B B T 20

Electronic bypass

(Interior view)

Inverter installation 2 x 7,5 kVA half load

parallel operation

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