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SPECIFICATION No. RDSO/PE/SPEC/AC/0024(REV.0)-2001

TECHNICAL SPECIFICATION FOR 25 KVA -THREE PHASE UNDER SLUNG INVERTER

FOR ROOF MOUNTED AC PACKAGE UNIT

0. FOREWORD 0.1 These inverters are to be provided on Self-Generating (SG) type AC coaches fitted with roof

mounted AC package unit. Such type of coaches have been provided with 110V battery in parallel with belt driven Alternator-Rectifier to supply input DC voltage to the inverter unit, which shall be giving 415V, 3-Phase, 50Hz as output to feed Air Conditioning load of the coaches.

1.0 SCOPE

1.1 This specification covers the requirements of design, manufacture, testing and supply of 3 phase

under-slung inverter unit complete with control, protections, indications, sensors, relays, transformers, chokes & meters etc. for roof mounted ac package unit provided on SG type AC coaches. This specification supercedes RDSO specification No ELPS/SPEC-20/04 (Rev-5) of Oct’99 along with its Amendment No 1 dated 25/09/2000.

1.2 The inverter shall use IGBT semi-conductors as power devices. The detailed specification of power devices used is to be given with the offer. Initially few units are to be commissioned by the manufacturer so that railway staff gets conversant with commissioning procedure and connections. (Number of inverters to be commissioned by the manufacturer can be mutually agreed between the supplier and purchaser)

2.0 REFERENCE TO VARIOUS SPECIFICATIONS

The following publications are applicable to the equipment in general: - Pub. IEC-571 IEC-571-1 (1990)

Rules for electronic equipment used on rail vehicles General requirements and tests for electronic equipments.

Pub IEC-310 (1991) Rules for traction transformer and reactors. Pub. IEC-141-1 (1975) IEC-411-5 (1992) Rules for traction converters. Indian Stds IS:7788 (1993) Specification for single phase traction converter. Indian Stds IS:8623 (1993) Specification for factory built assemblies of switch-gear

and control gear for voltage up to and including 1000V dc. Indian Stds IS:4237(1982) General requirements for switch gear and control gear for

voltage not exceeding 1000V or 1200V DC. Indian Stds. IS:13947(Pt.1) -1993 Degree of protection provided on enclosure for low voltage

switch-gear and control gear Pub.IEC-1287-1 (1997-07) Power converters installed on board rolling stock.

(Characteristics and test methods) RDSO Specn E-16/1(Rev.A) Reliability assurance.

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3.0 INTRODUCTION,SUPPLY ENVIRONMENTAL& OPERATING CONDITIONS

3.1 One 3-phase inverter has to feed one roof mounted AC package unit, therefore, two such inverters will be provided per coach. Each AC package unit consists of two nos. of "compressor motor" sets, two "condenser motor" sets, one "evaporator motor" set, two "compressor oil heaters", two sets of "Heating elements" and one "AC control panel". The two sets of heating elements are used for coach heating during winter season, utilising the same evaporator motor set as used in cooling mode. The compressors, condensers and compressor oil heaters will remain 'OFF' during heating mode and similarly heating elements will remain 'OFF' during cooling mode. The evaporator motor and control panel will remain 'ON' in both cooling and heating modes. The specification calls for 3-phase static inverter with either "SOFT START FEATURES" OR "DIRECT ON LINE" starting of connected loads. The control panel for both the types will be the same, however, necessary modifications required will be carried out in the AC control panel as per details given by the inverter supplier. 110V AC, control panel will be fed from the 415V AC output of the inverter through suitable step down transformer. The filter circuit required to smoothen the output needed for the AC control panel, will not be part of the ac control panel. The value of filter circuit components is to be designed and provided by the inverter unit supplier. Supply to AC control panel shall be available during heating/cooling modes and also if the heating/cooling modes are 'OFF".

3.2. Input to the inverter unit will be fed through battery bank of 110V DC in parallel with alternator, rectifier cum regulator. The voltage variation to the input side of the inverter unit will be 90V to 140V DC with 15% ripple.

3.3. The output voltage of 3 phase inverter unit shall be maintained 415V ± 5%, 50Hz. ±3% with input voltage variation mentioned above.

3.4 (A) INVERTER WITH DIRECT ON LINE STARTING - In case the inverter is with "DIRECT ON LINE" starting feature and there is only one inverter for the entire load, the motors will be started in sequence to avoid heavy in rush current from input source. Through AC control panel first evaporator motor will be switched "ON" with DOL starting and once it has picked up full speed both condenser motors will be switched "ON". After a time lag of 1 to 2 min. one compressor motor will be switched "ON" and the second compressor motor will be started with a time lag of 30 Sec. from the first compressor motor. The time lag will be provided by the time delay relays of the ac control pane l. The evaporator motor load and AC control panel shall remain "ON" in all modes i.e. cooling as well as heating.

(B) INVERTER WITH SOFT START FEATURES – Soft start features should be

available for compressor motors and condenser motors to avoid high starting current. However, evaporator motor may start direct on line. In this case both the compressor motors and condenser motors may start/stop simultaneously and time delay relays which are mounted in the ac control panel for compressor motor circuit and condenser motor circuit will be by passed.

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The auxiliary DOL power must be suitable for starting evaporator motor direct on line and switching "ON" the ac panel.

3.4.1 The inverter unit shall be suitable for operating voltage available as input i.e. 90V to 140V DC

with 15% ripple. The over voltage trip shall be set at 10% higher than the maximum voltage range i.e. 154V DC plus 15% ripple, i.e. approximately 170V DC.

Desired out put of the inverter will be 3-phase, 415V ± 5%, 50 Hz. ± 3% with the input voltage variations reference to clause no. 3.2.

3.4.2 To avoid excessive drainage of batteries, if required, the coach attendant may switch 'OFF'

completely or partially cooling/heating load but keep blower motor set "ON" when the input battery voltage is 100V DC. For this purpose an audio visual indication at 100V shall be provided. Time delay of one minute shall be provided for this audio visual indication to avoid its appearance during voltage dips, during starting of compressor and condenser motors.

3.5 COACH AC FAN LOAD

The 25 KVA inverter may feed the 110V AC fan load also of the coach. These fans will be fed from the output of the DOL inverter or from the Auxiliary DOL inverter, incase the design is with Soft Start features (clause 3.4 B). To meet the fan load, coach builders will provide suitable step down transformer (distribution transformer).

3.6 THE ENVIRONMENTAL AND OTHER SERVICE CONDITIONS ARE

GIVEN BELOW:

Ambient temperature -5 to 55 °C Annual average ambient temperature 35°C Humidity Upto 98% during rainy seasons Altitude Max. 1200 m above mean sea level. Atmosphere

Extremely dusty and desert terrain in certain areas. The dust content in air may reach as high value as 1.6mg/m3.

Rainfall Very heavy in certain areas. Coastal areas

The equipment shall be designed to work in coastal area in Humidity salt laden and corrosive atmosphere. The maximum value of the condition will be as under:- Max. PH value : 8.5 Sulphate : 7mg/liter Max. concentration of chlorine : 6 mg/liter Max.conductivity : 130micro semen/CM

Vibration/shocks Inverter is expected to work for 48 hours at a stretch. Flood proofing

The equipment shall be designed to run at 8 kmph through water up to 103mm above the rail level, allowance to be made in addition, for the increase in the height of the water level due to wave effect. Further, due to certain sections of the tracks becoming flooded with water to a standing depth of 0.76 meters, the under slung inverter shall be made water proof to this height above rail level. Water seepage if any, should be so restrictive that it should be possible to operate the inverter giving minor attention in the maintenance depot in respect of its cleaning and drainage of accumulated water.

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4.0 CUBICAL SIZE AND MOUNTING

The electronic control, power modules, chokes, cooling arrangement etc. housed in a cubicle shall be suitable for "Under frame" mounting. In case of any deviations from the dimensions, given below, will be finalised in consultation with RDSO and production units.

The Under-frame cubicle shall be water proof as per IP65 specified in IS: 13947. Dust shall not

enter in electronic section and electrically energised area. However 135 mm from the top of the inverter, the cubicle can be without IP65 protection.

The overall size of under-slung cubicle, including projections and mounting channels shall not

exceed 1630mm(L) 724mm(H) 1040mm(D). The maximum dimensions for display cubicle shall not exceed 700(L), 480(H) and 242mm(D). Smaller dimensions are desirable. The indications, meters, main switching arrangement panel shall be as compact as possible and housed in separate cubicle called as 'Display cubicle' which will be mounted inside the coach in non-AC area.

Choke if provided in a separate compartment/cubicle can be permitted without IP65 protection

provided that water if entered, should not affect the performance once drained and dried. Choke cubicle should form an integral part of the u/s inverter within the overall size as specified above. Choke if provided in a separate cubicle/compartment shall not have any cable entry holes and louvers in the portion below 135mm from the top mounting of cubicle. In case cable entry holes are below 135 mm from top, cable gland set of suitable size of reputed make conforming to IP 65 shall be provided. It shall also meet the flood proofing requirements given in 3.6 and 15.22.

5.0 CONNECTED LOAD The three phase output of the inverter is connected to a roof mounted AC package unit and

coach fans. The roof mounted AC package unit consists of one evaporator fan motor set, two condenser fan motors, two compressor motors sets, two crank case heaters, one control panel, two heating elements, each of 3KW star connected. AC package unit will be working in cooling mode during summer and heating mode during winter. The details of cooling mode and heating mode operations are given below:

5.1 COOLING MODE Under cooling mode the heating elements of 6 KW will remain 'OFF" and evaporator fan motor

set, condenser fan motors, compressor motors, crank case heater and control panel will be in operation. The control panel and evaporator fan motor will be continuously "ON" in this mode whereas the condenser fan motors and compressor motors will work intermittently depending on temperature requirement in the coach. The sequence of operation of the motors is explained in clause 5.3. The rating of connected load under cooling mode is given below:-

S.No Type of load Rating of each motor Nos. Total load a)

Compressor motors

5.3 kW, 0.8 PF lag, 415 V, 50Hz, 3-phase starting current 49A for 0.3 Sec to 3 Sec with DOL starting.

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10.60kW

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b) Condenser fan motor

1.3W, 0.8PF lag, 415V, 50Hz 3 phase starting current 10 A for 0.3 sec to 3 sec. with DOL starting

2 2.60 KW

c) Crank case heaters of compressors

50W, connected across 415V line -

2 0.10 kW

d) Evaporator fan motor

1.5kW, 0.8 PF lag, 415V, 50Hz, 3 phase starting current 15A for 0.3 Sec. to 3Sec. with DOL starting.

1 1.50kW

e) Control panel 200W, 110V AC, 50Hz, single phase filtered sine wave

1 0.20kW

f) WRA 746W, 415V, 3 Phase 50Hz. 1 0.746 kW g) Coach fan 60W, 110V, 50Hz, Single phase 14 0.840 kW Total 16.586kW

Total AC fan load of the coach is approximately 0.840 KW with the entire fan load in "ON"condition. 5.2 HEATING MODE 5.2.1 During the winter season when the ambient temperature is low it is necessary to circulate

hot air inside the coach. Under this operating requirement the compressor motors, condenser fan motor and crank case heater are switched off and 3 phase star connected heaters are switched ON for heating the coach. The control panel and evaporator fan motor will operate continuously. The details of electrical loads which remain OFF and ON during heating mode are given below:

ELECTRICAL LOADS SWITCHED 'OFF' DURING HEATING MODE

No. TYPE OF LOAD LOAD TOTAL LOAD a Compressor motors 2 x 5.3kW 10.60kW b Compressor fan motors 2 x 1.3kW 02.60kW c Crank case heaters 2 x 0.05kW 00.10kW Total 13.30kW

During heating mode the heater load will be switched ON. The heating elements will be

working intermittently depending on temperature requirement in the coach, whereas the AC control panel and evaporator fan motor will remain ON continuously. The rating of connected load during heating mode is given below :

TYPE OF LOAD LOAD nos TOTAL LOAD Heating elements Star connected 3kW, 3-phase, 415V, 50 Hz.

2 6.00kW

Evaporator fan motor

1.5kW, 0.8PF lag, 415V, 50Hz. Starting current 15A for 0.3Sec to 3Sec

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1.50kW

Control panel 200W,110V ac, 50Hz, single phase filtered sine wave

1 0.20kW

WRA 746W, 415V, 3 phase, 50Hz. 1 0.746kW

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Coach fan 60W,110V, 50Hz, single phase 14 0.840kW Total 9.286kW

Total AC fan load of the coach is approximately 0.840 KW with all the fans in "ON" conditions.

Consider 10 KW approximately as explained below :

5.2.2 The above heaters rating indicated is for 3 phase, 415V, 50 Hz, sine wave, whereas it will be operating with PWM power supply, therefore, harmonic contents will contribute additional heating and the current/voltage reading taken by conventional meters will not be accurate. The heater load, therefore, shall be taken as 7.0 KW instead of 6.0 KW indicated above.

5.3 OPERATION DURING COOLING/HEATING MODE 5.3.1 SYSTEM WITH DIRECT ON LINE (DOL) SCHEME : 5.3.1.1 The evaporator fan motor will be started "DIRECT ON LINE" first. Once the evaporator fan is

running normal, two condenser motors will be started DOL. After evaporator fan and condenser motors are running normal, one compressor motor will be started DOL and the second compressor motor will be started DOL with the time lag of 30 seconds of the first compressor motor starting. Both the compressor motors may switch 'ON' or switch 'OFF' simultaneously without any time lag under abnormal working conditions.

5.3.1.2 The inverter shall be suitable for meeting direct on line starting current as mentioned in 5.1 (a)

for 2x5.3 kW compressor motors while evaporator motor, ac control panel load and condenser motors load is already being met with.

5.3.1.3 The inverter output supply of 415V ± 5%, 50 Hz ± 3% will remain ON in direct on line system.

The contractors of main compressor and condenser motors or heaters will be closed or opened depending upon the cooling or heating requirements.

5.3.2 SYSTEM WITH SOFT START FEATURES 5.3.2.1 The system offered with "Soft Start Features" may have direct on line starting of evaporator

motor set being of lower rating, whereas, compressor motor and condenser motor sets shall be provided with soft start features. The compressor motor and condenser motor set shall start together. Time delay relays in ac panel will be by passed with the soft start system. The cubicle will be with two inverter-cum-rectifier units built in with one soft start feature for compressor and condenser motor and other with/without soft start feature for evaporator motor and ac control panel.

5.3.3 Keeping in view the requirements inside the coach evaporator fan motor will remain 'ON'

continuously whereas the compressor and condenser motor or heaters will work intermittently depending on temperature required.

5.3.4 In case of soft start system, the unit with VVVF control feeding compressor and condenser

motors will be used for supply to heating elements during heating mode.

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5.3.5 The compressor, condenser motors, crank case heaters and evaporator motor will be in circuit during cooling mode. The heater load of 6.0 kW will remain 'OFF' during cooling mode. During heating mode compressor and condenser motor will remain 'OFF' and the heaters will be 'ON' or 'OFF' intermittently depending on temperature requirements in the coach whereas evaporator fan motor will remain 'ON' continuously.

5.4 DESIGN CRITERIA All the motors are industrial type, squirrel cage induction motors and due care for starting and

operating current at minimum/maximum voltage and current limit shall be taken under normal, abnormal and fault conditions. The inverter shall be designed to meet the full 25 KVA load at minimum input voltage of 90V DC. All the Electronics and power devices including chokes etc. shall have adequate design margin to meet the current load with input voltage of 90V DC. Entire inverter design including the input protection devices and power supplies etc. shall also be suitable to withstand input of 200V DC for a period of two minutes without any damage to any part of the inverter unit.

5.4.1 INFRINGEMENT OF PATENT RIGHTS Indian Railways shall not be responsible for infringement of patent rights arising due to

similarity in design, manufacturing process, use of the components, used in design, development and manufacturing of inverter and any other factor which may cause such dispute. The responsibility to settle any issue rises with the manufacturer.

6.0 INVERTER REQUIREMENTS

The unit/inverter shall meet the following operating requirements : Requirements

Operating parameters.

Ambient -5 to 55°C

Input to unit/min/nom./max.

Input to inverter unit will be 90V/110V/140V with 15% ripple.

Rated output capacity of inverter

25kVA min. at 0.8 PF(50Hz) voltage range given in (2) above.

Connected load As per clause 5.0 Inverter output A) 415V±5%, 50Hz ±3%, 3-phase PWM sine wave for DOL

system of compressor and condenser motors. OR B)VVVF control for compressor and condenser motors for soft start system. WITH c)DOL starting of evaporator motor and ac control panel either from the main output of DOL inverter in case of (a) above or separate DOL converter in case of (b) above.

Starting of motors As per clause 5.3.1 & 5.3.2. Current harmonics at full load

Less than 5% up to 20th harmonic upto 1000Hz.

Duty cycle The unit shall be capable to withstand 20 cycles/hrs of 1.5 min. “OFF” for actual connected compressor and condenser load with continuous load of evaporator motor, ac panel and coach fans to meet 25kVA load as per offered design.

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Cooling Natural cooled only. However, a small internal fan for churning air to improve heat transfer is permitted provided its failure does not lead to excessive temperature rise.

Efficiency at - full load at 0.8pf, 50Hz Light load of 1.5kW at 0.8pf , 50Hz

Not less than 90%* around 85% preferred.

Construction

Modular (Rack/box type)

Protections As per clause 8. Indications As per clause 9. Meters

As per clause 10.

Weight It should be as light as feasible.

NOTE : * Design incorporating necessary features to achieve 93% efficiency at full load,

0.8 power factor ,50 Hz and 110V DC input is desirable. 7.0 INFRASTRUCTURE FOR QUALITY ASSURANCE :

The following facilities are considered desirable for the manufacture of quality and reliable product.

i. Dust free environment for the assembly of PCBs.

ii. Component lead forming machines/fixture.

iii. Temperature controlled wave soldering machine with auto-fluxing facilities.

iv. Dry heat test chamber.

v. Power analyzer

vi. Multi-channel temperature scanner.

vii. Suitable test equipment for measurement of PWM supply.

viii. Functional testing of PCBs preferably with computer.

ix. Electro static discharge protection in line with IS:10087-1981. Work procedure for following ESD practices needs to be submitted.

x. Automatic/light beam guided component insertion machine for PCBs.

xi. In circuit testing machine for checking the correctness of component inserted in PCBs.

xii. ISO 9001 Certification.

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Facilities from serial No. (i) to (vii) are considered essential at developmental stage.

Use of all the above facilities are considered necessary during the bulk production and requires verification by RDSO before placing the firm as a regular source. The firm will advice the facilities as existing on date with details along with the proposed plan for augmentation of the short fall with expected duration along with the offer. Duration in any case shall not exceed one year from the date of the first order as per this specification. Noncompliance after this date will debar the firm for further order.

This shall generally form a criteria for evaluating/grading of the firms at the tender evaluation stage.

8.0 PROTECTIONS

The inverter shall be provided with the following protections:

- Potection against ingress of dust and water shall be IP 20 for on board display unit and IP 65

for under-slung cubicle. - DC MCCB on input side. - Input fuses with fuse blown indication. - Input over voltage set at 170V DC - Input under voltage set at 90V DC - Output short circuit protection shall preferably be with IGBT trigger pulse block - Overload protection and single phase protection - Earth fault on ac side - Polarity reversal at input side - Over temperature of power semi-conductor devices - Voltage surge suppressor at input and output side - Capability to withstand input of 200V DC without any damage to any part of the inverter unit

9.0 INDICATION AND DISPLAY BOARD

The inverter shall be provided with the following LED lamp indication on display board :- 9.1 INDICATIONS:- - Input DC ON - Inverter ON - Booster fault - Inverter fault - Fuse Failure (For input fuses) - Earth fault - Reverse polarity - Input over voltage - Input under voltage less than 90V DC - Input voltage less than 100V DC with potential free contact

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9.2 FAULT DIAGONOSTIC

The inverter shall have either of the following features for fault diagnostics. i. Display board - The inverter shall be provided with display board indicating fault number with

brief description for voltage/current, temperature parameters etc.. Transparent Perspex window shall be provided in front of indications and Display board and it should be capable to login at least latest ten faults.

ii. Port for down loading of faults - Inverter shall be provided with self-checking feature and facilities to down load to PC through RS-232 or other suitable port. In case of under slung inverter RS-232 port shall be on the On Board Display panel as well as under slung cubicle. Offered diagnostic system shall be capable of recording preferably ateast 10 latest faults.

10.0 METERS

Inverter shall be provided with the following analogue/digital meters of not less than 72 mm size:

- Input ammeter - Input voltmeter - Output voltmeter (with phase selection switch) - Output ammeter (with phase selection switch)

However in lieu of analogue/ digital meters LCD/LED/VFD display of above parameters through push button is also acceptable.

11.0 CABLES 11.1 The use of wires/cables shall be reduced to minimum. The use of insulated copper busbar is

preferable. The wires/cables below 10 sq.mm. shall be PTFE and higher than 10 sq.mm. cables shall be Elastomeric. The use of PVC cables/wires is not acceptable.

11.2 Interconnecting control cable between ON Board Display cubicle and U/S inverter alongwith their end connections of suitable IP protection of suitable length will form a part of supply against the order for supply of U/S Inverter.

12.0 PANELS 12.1 The 'ON BOARD’ display cubicle enclosure with its control shall be with IP-20 degree of

protection .The cubicle shall be mounted inside the coach. However the manufacturer shall ensure that entry of dust does not effect the performance of inverter.

12.2 The front panel door shall preferable be in two halves and shall have suitable locking

arrangement with key. 12.3 The cooling arrangement for Under Slung inverter shall be ‘Natural cooled Type’ only. It shall

be possible to attend/replace the components from the front side. 12.4 Cable grommets of suitable size as required for input and output cables shall be provided for

cable entry/exit . 12.5 All the indications, meters shall be visible from front panel and possible to operate MCCB/other

switches without opening the front panel. Removal/fitment of all equipment and connections

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shall be possible on opening the front panel since no space is available on rear side and on sides of cubicles.

13.0 GENERAL CONSTRUCTION OF INVERTER CUBICLE 13.1 For ease of maintenance, rack type/modular construction shall be adopted.

The cubicle for Under Slung inverter shall be closed from all sides to avoid dust collection and water entry. No water entry shall occur under hose proof/shower tests as prescribed in IS : 13947 for IP65 protection. However 135 mm from the top of the inverter, the cubicle can be without IP65 protection.

14.0 GENERAL POINTS FOR GUIDANCE 14.1 The "Under slung" type inverter cubicle shall be designed for mounting/fixing from the top of

the cubicle. Suitable rigid angle frame shall be provided. All the fasteners used should be cadmium plated or zinc passivated conforming to IS:1572 and IS:1364. Hexagonal headed bolts shall preferably be suitable for both spanner as well as screwdriver tightening. The metallic cold rolled steel sheet min. 1.6 mm thick and conforming to IS: 513-1963 shall be used for panel construction.

14.2 The potential free heat sinks shall be so located as to reject heat outside the cubicle and

enclosed in a separate duct and the electronic box shall be so designed that no dust enters the electronic control chambers. Modular construction shall be adopted for easy maintenance and replacement. Anti vibration pads shall be provided for equipment assembly/electronic control rack in case of rack assembly.

14.3 All the cables and wires used for wiring/cabling shall be of copper multi-strands and neatly

secured in position. The use of PTFE insulated wires is recommended. The thicker cables shall be with elastomeric insulation. Use of PVC wires/cables is not accepted.

All the cable terminals shall be made through crimped sockets/lugs and wires with circuit and diagram furnished. Each cable/wire shall be numbered at both ends for easy maintenance. The use of pre- insulated lugs suitable for double crimp for insulation and conductor is recommended. Current collection through threads must be avoided and terminals of adequate size shall be provided.

14.4 Anti-corrosive protection coating on PCB shall be applied to avoid corrosion in service. The

protective coating shall be transparent so that type/ratings of component are readable. The protective coating on track side of PCB shall be of solderable type.

14.5 Hylam PCBs are not acceptable since the insulation level reduces drastically in rainy season.

The use of silicon coated wire wound resistors and metal film resistors are recommended for high reliability. Heat dissipating high wattage resistor or components shall not be mounted close to control PCB. The workmanship shall be of highest grade and due care shall be taken for every item.

14.6 The main compressor motors some time may start with some amount of gas back pressure

resulting in requirement of higher starting torque. This shall be taken into account while fixing

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the current limit feature. Wire mesh, filters etc. provided shall be removable and easy for removal/fitting back in position and for easy maintenance/cleaning.

14.7 Tinned copper earthing pad with tapped hole and brass M10 bolt with flat surface and spring

and flat washers shall be provided on front side of the inverter cubicle frame member. 14.8 The bus bar termination must be same as of existing cubicle/RCF/ICF requirements for

interchangeability of various makes of inverters. A bus-bar layout drawing with details of termination, supporting points, size and clearances etc. shall be submitted for approval before making prototype unit.

14.9 Each module shall be complete with its power devices, control cards, sensors, protections and

card indications etc. for easy replacement in service. Each card shall be numbered for easy identification and replacement.

The wires/cables shall be away from the heat dissipating resistors or heat sinks and properly supported with the help of insulated supporting member or in a insulated duct.

14.10 All inverter transformers shall have insulation of "H" class. The temperature rise at full load

shall not exceed 90 C. Chokes used in filter circuit can be with 'B' class insulation. 14.11 The output AC voltmeter shall be suitable for PWM application, alternatively it shall measure

output voltage through suitable filter. 14.12 The churning fan, if provided and fed with AC supply shall be fed through sine wave filter in

case output of the inverter is not pure sine wave. 15.0 TESTS:

Separate type, routine, acceptance and investigation tests for inverter assembly and complete inverter unit installed on a coach will be conducted. Type tests will be performed on one inverter unit of given design to verify that product to meet the requirements specified and agreed upon between user and manufacturer. Subject to agreement between user and manufacturer some or all the type tests shall be repeated once in two years by RDSO and purchaser on sample basis, so as to confirm the quality of the product to meet the specified requirements. In addition, the manufacturer shall repeat the type test to be witnessed by representative of RDSO and purchaser either totally or in part in following cases without any additional cost :-

- Modification of equipment likely to effect its function. - Failure or variations established during type or routine tests - Resumption of production after an interruption of more than two years. - At the time of indigenisation, if the firm is having TOT with foreign collaboration in consultation with purchaser.

Routine tests are to be carried out to verify that properties of the product corresponding to those measured during type tests. Routine tests are to be performed by the manufacturer on each equipment.

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Investigation tests are intended to obtain additional information regarding the performance of the product. They shall be specially requested either by the user or the manufacturer. RDSO may conduct surprise check on manufacturing process and quality control alongwith any of the test to ensure quality of product and its conformance to RDSO's specification.

15.1 VIBRATION AND SHOCKS TEST (TYPE TEST)

The complete inverter cubicles together with its mounting arrangements (including shock absorbing devices if provided shall be subjected to the following tests:

The inverter under test shall be secured in a suitable position to a vibration machine producing vibrations of sinusoidal form with adjustable amplitude and frequency. The test frequency lower than 5 Hz may be omitted. The equipment will in energised condition at no load. These tests, if already performed earlier on Rev.4 or rev.5 of RDSO specification No ELPS/SPEC-20/04 , and when no significant structural changes are involved, need not be repeated.

15.1.1 DETERMINATION OF RESONANCE FREQUENCY.

In order to determine the possibility of critical frequencies producing resonance the frequency shall be varied progressively over the whole range of 5 Hz to 100 Hz within a time of not less than 4 min., the amplitude of the oscillation being that indicated "a" expressed in millimeters, is given as a function of "f" by the equation: -

25 a = --------------------- for 1 Hz to 10 Hz f 250 a = -------------------------- for 10 Hz. to 100 Hz f² 15.2 TEST WITH FORCED VIBRATION (TYPE TEST)

The inverter under test shall be subject to a test with forced vibrations for a period not less than 15 min. at the critical frequency if such a well defined frequency (Resonance frequency) has been detected in course of test of 15.1.1.

Apart from this, test is also required to be carried out at a frequency of 10 Hz or around 10 Hz in case resonance frequency is 10 Hz for a period of 4 hrs. in each direction.

In both the cases, the amplitude of vibrating table is adjusted to the value corresponding to frequency given above. The inverter shall be tested under energised condition at no load.

In case failures during service are attributed to vibration, as an investigative test, vibration test for 25 to 50 hours as decided by the purchaser will be required to be carried out.

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15.2.1 SHUNTING SHOCKS

The inverter shall be subjected to a series of three successive shocks (one cycle) each corresponding to a maximum acceleration of 3g in all the three direction.

The equipment shall be subjected to 4 cycles i.e. 12 shocks in each direction. The tests are considered to be satisfactory in case there is no resulting damage, loosening of connections/ components/sub-assemblies, abnormality in operation. The inverter shall be able to pass electrical performance tests after this test.

15.3 COOLING TEST (TYPE TEST)

The purpose of this test is to verify that the cooling of various components/assemblies cooled by the cooling media for under slung inverter is adequate, therefore, it shall be carried out during heat run test with a suitable blower provided for the test to give air output at the rate of 4 meters/sec. as well as without any air flow for further two hours.

- At nominal output voltage ULN = 415V ac, 3-phase, 50 Hz.

The test results are considered satisfactory provided the temperature rise of components/assemblies recorded and corrected for the surrounding cooling air temperature of 550C are within the permissible limit and specified safety margins for junction temperature under worst conditions. The minimum permissible limit of safety margin is 100 C.

15.4 EFFECTIVENESS OF FILTERS (Type Test)

The purpose of this test is to verify the effectiveness of the means provided to reduce ingress of dust and water as per enclosure IP degree of protection. The test shall be conducted as per IS :13947.

The test is considered satisfactory in case of no ingress of water in the cubicle and dust deposit on electronic cards surface where tracking can take place is detected. The filter shall be clearable and easy to replace.

15.5 TEST ON PROTECTION AND MEASURING METERS : (Type & Routine Test)

The purpose of this test is to verify that protections provided are functional and operative at set value.

The tests shall be conducted by simulating the corresponding conditions.

15.6 TRIGGER EQUIPMENT TEST - (TYPE TEST)

The object of this test is to verify, that the triggering pulses comply with the specification and the details shall be furnished by the manufacturers.

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15.7 INSULATION RESISTANCE & DIELECTRIC TEST - (TYPE & ROUTINE TEST) The insulation resistance with 1000V megger shall not be less than 10 M ohms for all the

circuits.

The dielectric test shall be carried out after shorting power semiconductor devices, primaries of trigger equipment, pulse transformers earthed and disconnecting special card if necessary before applying dielectric voltage corresponding to the voltage given below:-

i) 415V ac circuits, at 80% of isolation voltage (Visol.) r.m.s. of IGBTs, 50 Hz, 1 min.

ii) 110V dc circuits, 1500V rms , sinewave , 50 Hz for 1 minute.

iii) Below 110V dc circuits 1000V rms, sinewave ,50 Hz. for 1 minute.

iv) 24V circuits 500V (r.m.s.), sinewave, 50 Hz for 1 minute.

Test is considered satisfactory if there is no flash over or tripping of dielectric test equipment set at 50 mA leakage current is experienced.

15.8 LIGHT LOAD (TYPE AND ROUTINE TEST)

This test is carried out to verify that the inverter is correctly connected and is capable of withstanding voltages likely to occur in service. Suitable load is connected and the supply voltage is maintained at its nominal value. Output quantities i.e. trigger, control signals, output voltage, frequency etc. are to be checked and recorded and compared with declared values.

15.9 RATED CURRENT LOAD TEST (TYPE & ROUTINE TEST)

The purpose of the test is to verify the rated current load capacity of the inverter at 0.8 PF (50 Hz). In case the declared rating is more than rated load the test shall be conducted corresponding to higher value claimed by the manufacturer.

The short time rating specified in the offer shall also be verified during the type test only for the specified time duration or duty cycle.

The test may be conducted during heat-run/Temperature rise test.

15.10 TEMPERATURE RISE TEST (TYPE TEST and AFTER EVERY 50th INVERTER)

The inverter shall be loaded to full load current corresponding to 25 KVA rating of inverter with minimum input voltage of 90V DC at 0.8 power factor. The temperature rise shall be recorded by temperature detectors mounted at the specified reference points on the body of semiconductors, inductors, filter capacitors and other components as agreed between purchaser and manufacturer. The maximum recorded temperature under worst loading conditions shall be corrected for 55 degree C and compared with maximum permissible temperature (for power devices at junction). The thermal margin available shall be compared with the safety margin

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declared by the manufacturer. Under loading conditions as specified above, the corrected temperature of the power devices shall have a margin of minimum 100 C. Temperature of Inductors/Transformers shall not exceed 155 degree C when corrected to 550 C. for "H" class insulation. The inverter shall also be subjected for short time rating after continuous loading to ensure the temperature rise is within the permissible limit. The maximum temperature rise of the electronics devices on the PCBs should not exceed approximately 200C for industrial grade components suitable for 850C environment, when measured at half inch away from identified critical components. In case, it is exceeding this limit, use of mil-grade component can be considered keeping RDSO informed.

15.11. POWER LOSS DETERMINATION (TYPE TEST & 5% OF LOT SIZE)

The losses at "No-load", "Light load", 16KW load and "Full load" losses shall be recorded at minimum, nominal and maximum voltage. The efficiency when calculated shall not be less than 90% at full load and 85% and light load of 1.5 kW at 0.8 pf (50 Hz).

15.12. SHORT CIRCUIT TEST (TYPE TEST & 5% LOT SIZE)

A short circuiting contactor shall be connected in parallel with the load. The short circuiting contactor shall be closed after the normal current through the load has been recorded for 1 min. The resulting fault current shall be detected and cleared by the protective-clearing equipment in total time specified for the equipment to function. No fuse shall blow or semiconductor device fail. The inverter shall remain "OFF" after clearing the fault and shall func tion normal on removal of fault and reset operation.

15.13 LOAD BREAK TEST (TYPE TEST)

A contactor is connected in series with the load. After the rated current has been flowing in load for 1 min., the contactor switches "OFF" the current. The test shall be repeated three times.

15.14 INPUT UNDER VOLTAGE, OVER VOLTAGE AND TRANSIENT TEST (TYPE TEST)

The input voltage shall be reduced below 90V and check that inverter switches 'OFF' prior to 87 volts and automatically switches 'ON' after the input voltage exceeds 95 volts.

The input voltage shall be increased beyond 170V DC and check that inverter switches "OFF". The input voltage is raised to 200V DC and maintained for two minutes. There shall be no damage of any nature to any of the components of the inverter.The inverter shall automatically switch 'ON' after the voltage is decreased below the set value.

The design will incorporate necessary feature of suitable time delay/hysteresis to avoid hunting for both under voltage and over voltage trippings. Transient voltage test shall be conducted as per clause 22 of IEC-571.

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15.15 ACOUSTIC NOISE MEASUREMENT (TYPE TEST and 5% lot)

The sound pressure level shall be measured in order to ensure that it is not exceeding the limit value of 75 dB (A) at a distance of 1 meter away from the equipment in all the direction. Tests will be performed at No-load, Full load and 16 kW load. However the manufacturer shall endeavor to reduce the noise level below 70dB.

15.16 VISUAL INSPECTION (TYPE AND ROUTINE TEST)

The object of this visual inspection is to check that the inverter is free from defects, surface treatment and the main components are as per approved type and ratings.

The dimensions, mounting dimensions and arrangement, bus-bar terminations and other parameters considered necessary shall also be verified and checked from approved drawing.

15.17 PERFORMANCE TEST (TYPE AND ROUTINE TEST)

Inverter unit shall be connected to AC package unit at rated full load and the input voltage shall be varied from 90V to 140V DC and record the output phase voltages, and frequency at 90V, 110V and 140V DC input. The readings shall be well within the prescribed limits at no- load, light load and full load at 0.8 PF (50 Hz).

Set the input voltage at 110V DC and switch "ON" full load and record parameters i.e. voltage, current, frequency and regulation from no- load to full load etc. Reduce the input voltage below 100V DC (say 99V DC) and hold for some time at this point. Check that audio visual indication for 'INPUT VOLTAGE < 100V DC' is operative. Reduce the input voltage further and check that inverter trips below 90V DC. Record the input voltage at which the inverter trips. This shall not be lower than 87 volts.

Increase the input DC voltage and check that inverter is "ON" at 95V DC and it trips when input voltage is beyond 170V. Increase the input voltage to 200V DC and maintain for two minutes and check that no damage occurs in any part of the inverter. The inverter shall function normally after this test.

Check the functioning of the MCCB by operating it at least five times. Verification of indications shall be done by simulation method.

15.18 EARTH FAULT (TYPE & ROUTINE TEST)

Simulate the earth fault by connecting suitable resistor between cubicle frame and output phases. See that inverter does not trip and earth fault indication is in "OFF" state till the leakage current is less than 30 mA. However inverter shall trip and earth fault indication appears when the leakage current exceeds 30 mA.

Earth fault condition shall also be created by direct short between phase and inverter frame to ensure that the unit can withstand this condition also.

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15.19 MEASUREMENT OF INPUT RMS CURRENT RIPPLE (TYPE TEST)

The additional generated RMS current ripple by the inverter to the battery when measured as mutually agreed test programme is less than 10 Amp under worst conditions from no- load to full- load.

15.20 DRY HEAT AND DAMP HEAT TEST :

The dry heat and damp heat test shall be conducted on all PCB's as per latest IEC-571. However the temperature for Dry Heat Test shall be 80 degree Centigrade against 70 degree centigrade.

15.21 TEST FOR POWER SUPPLY :

The power supply shall be tested for its regulation and any surges/spikes shall be recorded to verify that it does not cause any harmful effect on electronics devices.

15.22 TEST FOR WATER PROOFNESS

The water proofness test shall be done on the cubicle by dipping the equipment in water leaving 135 mm from top of the inverter for one hour under de-energised condition. Water shall not enter in harmful quantity in the cubicle. It should be possible to operate the inverter after draining out the water ingress and cleaning of PCBs. Immediately after this test, water will be removed from the bath and also water if any accumulated in the inductor cubicle if design as a separate cubicle/compartment will be drained out through drain plug to be provided by the manufacturer and the inverter shall function normally.

15.23 ACCEPTANCE TESTS

Each unit shall be subjected to the following tests for the inverter unit in the presence of railway nominated representatives :

1. Visual inspection. (Ref. clause No. 15.16) 2. Insulation and Dielectric test. (Ref. clause No. 15.7) 3. Performance Test. (ref. clause No. 15.17) 4. Verification of protections, indication and functioning of meters (Ref. Clause No. 15.5) 5. Tests indicated on 5% of lot size i.e. tests to clause No. 15.11, 15.12 and 15.15 6. Earth fault test(ref clause no. 15.18)

15.24 PRE-COMMISSIONING AND COMMISSIONING TESTS

Unpack the inverter unit and check that it is not damaged. Energise the unit and check for performance tests by simulation method before fitment on the coach. Mount the assemblies of the unit on the coach and conduct the following:-

Proper mounting of cubicle and its rigidity. Insulation and dielectric Test. Performance Test. Proper functioning of protections, indications meters by simulation method and operating switches. Ensure operation of earth fault unit as explained above in clause 15.18.

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Check starting of both compressors at 90V DC input on first 2 coaches and on every 20th coach provided with same make of inverter.

Apart from this, after clearing the prototype test, the equipment shall be installed on a coach and on line monitoring shall be conducted by RDSO in association with the supplier to monitor the following:

1. Temperature rise on electronics at critical components as identified. 2. Harmonic analysis at three phase output, DC input to the inverter and at the source i.e. battery 3. Acoustic noise measurement 4. Input over voltage when the load is thrown off.

All the necessary arrangement for the on line testing and instrumentation involved shall be arranged and installed by the manufacturer. This monitoring is to be done only once as a type test and need not to be repeated if already carried out in Rev.4 or Rev.5 of RDSO specification No ELPS/SPEC-20/04 , in case no significant change is involved in the inverter.

15.25 MARKING The inverter rating plate shall be marked with the following information.

i) Type/Make ii) Contract number iii) Month and Year of manufacturer/Batch No./S.No. iv) Rating KVA Input voltage range Output voltage, frequency and wave shape. Overload capacity in KVA and duration in sec. v) Connection diagram with terminal marking. vi) Operating system Direct On Line/Soft start.

In addit ion to this the make/type shall also be embossed on panel which should be legible and lasting till equipment life.

16.0 GUARANTEE

The inverter unit complete with transformer/choke, rectifier, inverter and control shall be guaranteed for a period of 24 months from the date of commissioning or 36 months from the date of supply whichever is earlier. Any design defect, defective material, underrated component used, etc. have to be corrected and merely replacement of defective parts will not be considered adequate. Complete investigation report of each defect/failure shall be submitted to RDSO and purchaser for each case.

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17.0 SPARES AND MAINTENANCE MANUAL

A list of spares required for a period of 2 years maintenance shall be submitted with the offer in printed form and neatly compiled in a booklet form. The operating and maintenance manual giving instructions for installation, maintenance, circuit diagram with voltages at salient points to locate faults, list of components with brief specifications and suppliers etc. trouble shooting and testing procedure after repair shall be supplied. In addition to above, working principle, precautions to be taken, fault diagnostic upto component level, component testing before its fitment, component hand ling etc. shall be in-cluded in the maintenance manual. The original numbers on IC, transistors and other components shall not be erased or painted. Moulded blocks with hybrid circuit are not accept-able.

18.0 INFORMATION TO BE SUBMITTED

The tenderer must submit the following information with the offer in printed form and neatly compiled in a booklet form. Offer with incomplete information may not be considered.

a) Detailed specification of the offered inverter, trans former, inductor, input fuses, input MCCB

and data sheets . b) Details of protections provided and their effectiveness/proposed set values and range and

working principle. c) Details of semi-conductor devices used and their specification and data sheets.

d) Circuit diagrams alongwith bill of material, and cir cuit description and working principle. e) Safety margins in voltage, current, thermal (for junc tion temperature) alongwith the limit values

for power devices, inductors and transformer etc. f) Declared output voltage wave-form power factor and regulation. g) Drawings and details of dimensions, mounting arrangement and weight. h) Details of operating panel and function of each switch, indications and fault diagnostic features. i) Detailed description/explanation of circuit adopted and its salient advantages. j) Burn in procedure followed for components/assembled cards. The temperature and duration of

burn in period shall be indicated or procedure followed to ensure reliable components and premature PCB failure.

k) Duty cycle considered for inverter design for continuous and short time ratings. l) Service experience for the offered unit or similar units. m) Data sheet duly filled as per annexure 1.

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n) A set of different colored photographs of the inverter which clearly shows the outside and

inside details in different photographs. 19.0 APPROVAL OF DESIGN/DRAWINGS

After placement of order, the approval of detailed design, drawings will be advised by RDSO/Lucknow for which detailed design calculations, specification of components, drawings are to be submitted by the tenderer. The comments received from purchaser railways shall also be studied and discussed with RDSO.

Based on provisional approval of design/drawings prototype two units (one coach set) shall be manufactured after incorporating all the modifications found necessary during in-spection/testing without any additional charges.

20.0 INSPECTION AND TESTING

Prototype units will be jointly inspected/tested by RDSO and purchasers representatives at manufacturer's works or where the type tests are arranged. The routine tests are to be carried out by the manufacturer and record kept in a proper form. Nominated representative of railways may ask and see the routine test results conducted.

The acceptance tests are to be conducted in the presence of railways nominated representative on the samples selected at random or on all as agreed between purchaser and manufacturer. Purchaser has the right to insist acceptance tests or routine tests on each unit in the presence of his nominated representative.

21.0 FAILURES DURING WARRANTY PERIUOD OR UNDER

MAINTENANCE CONTRACT.

The details of failures, action taken, action taken to arrest re occurrence of similar failure in future, failure report, investigation report, failure analysis are to be submitted to RDSO and purchaser railways.

In case of repeated failures, necessary changes in design on the units put in service or in production line are to be made by the manufactures. Investigation tests, if considered necessary, are to be arranged/conducted by the manufacturer.

22.0 FINAL ACCEPTANCE The firm shall be granted status as a regular supplier for the equipment from the date of expiry

of the warranty period, provided the performance of the equipment is found satisfactory.

If on the other hand the equipment is not in perfect working order at the end of warranty period, the purchaser may either extend the period of warranty until necessary modifications are carried out by the contractor. A certificate of Final Acceptance shall then be issued by the purchaser.

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23.0 TRAINING

The contractor shall undertake to train, free of cost the supervisors of the Indian Railways for operation, maintenance, fault finding, repair of the offered equipment under guidance of skilled engineers, during the first year of the service of the equipment. The number of supervisors to be trained against a contract will be indicated by the accepting authority. The wages and allowances of each Railway Supervisor nominated for training shall be paid by the purchaser. The purchaser shall bear the cost of the passage to and fro from the place of training for the railway supervisors.

24.0 SERVICE ENGINEERS

The successful tenderer shall be required to make available the services of his engineer/engineers free of cost to watch performance of the equipment in service periodically and also carry necessary repairs or replacement under warranty obligations.

25.0 WITHDRAWAL OF APPROVAL:

The approval granted to the manufacturer is liable to be withdrawn in the event of noticing any change at a later date in the design or change from the bill of material as approved earlier without seeking RDSO's approval or using components of inferior specification/quality compromising with the reliability.

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1 ANNEXURE-1

DATA TO BE FURNISHED BY THE TENDERER

1.0 RATINGS Continuous rating. .......kVA .......PF. ........V. .......Hz. Short time rating ........kVA ........for ....... seconds. 2.0 CUBICLE 2.1 Cubicle sizes (inclusive of all projections) Height..........mm Width...........mm Depth...........mm 2.2 Weight ................Kg 2.3 Type of mounting Underslung 2.4 Degree of protection - Underslung cubicle IP...... - Display Panel IP...... 3.0 SWITCHING DEVICE USED 3.1 Type IGBT/MOSFET/GTO 3.2 Make ................. 3.3 Rating - Voltage ................. Current ................. 3.4 Characteristic curve ................. 3.5 Total power devices used ................... per cubicle. 3.6 Maximum permissible junction temperature for the device and de-rated value considered in design. .. .

..... Degree C 3.7 Power devices connection arrangement.

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4.0 TRANSFORMER/CHOKE 4.1 Nos. 4.2 Whether used at intermediate stage or output stage 4.3 operating frequency. 4.4 Suitable for mounting On floor/Underframe 4.5 Rating Inductor/Transformer ..............KVA 4.6 Type of insulation ........ Class. 4.7 Temperature rise at full load .......... C 4.8 Degree of protection IP.... 4.9 Air cored/Iron cored (for Inductor) ............. 5.0 Details of all the protections 6.0 EFFICIENCY AND LOSSES - No load losses ............... Watt - Full load efficiency with specified input voltage. ................% - Light load efficiency at 1.5KW load at specified input voltage. ...............% - Details of 110V ac sine wave filtered power supply for AC control panel. 7.0 Output waveshape and % harmonics at full load ......... 8.0 MCCB i) Make ii) Rating iii) Data Sheet iv) Type test certificate

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9.0 MAIN FUSE : i) Make ii) Rating iii) Data Sheet iv) Type test certificate 10.0 FILTER ELEMENTS - Nos. - Size - Type - Cleaning Method

---------- X ---------

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I N D E X CLAUSE No. DESCRIPTION PAGE No. 0 FOREWARD 1 1.0 SCOPE 1 2.0 REFERENCE TO VARIOUS SPECIFICATIONS 1 3.0 INTRODUCTION, SUPPLY, ENVIRONMENT AND OPERATING CONDITIONS 2 3.4 INVERTER WITH DIRECT ON LINE STARTING 2 3.5 COACH AC FAN LOAD 3 3.6 THE ENVIRONMENTAL AND OTHER SERVICE CONDITIONS. 3 4.0 CUBICLE SIZE AND MOUNTING 4 5.0 CONNECTED LOAD 4 5.1 COOLING MODE 4 5.2 HEATING MODE 5 5.3 OPERATING DURING COOLING/HEATING MODE 6 5.3.1 SYSTEM WITH DOL SCHEME 6 5.3.2 SYSTEM WITH SOFT START FEATURES 6 5.4 DESIGN CRITERIA 7 5.4.1 INFRINGEMENT OF PATENT RIGHTS 7 6.0 INVERTER REQUIREMENTS 7 7.0 INFRASTRUCTURE FOR QUALITY ASSURANCE 8 8.0 PROTECTIONS 9 9.0 INDICATION AND DISPLAY BOARD 9 9.1 INDICATIONS 9

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9.2 FAULT DIAGONOSTICS 10 10.0 METERS 10 11.0 CABLES 10 12.0 PANELS 10 13.0 GENERAL CONSTRUCTION OF INVERTER CUBICLE 11 14.0 GENERAL POINTS FOR GUIDANCE 11 15.0 TESTS 12 15.1 VIBRATION AND SHOCKS TEST (TYPE TEST) 13 15.1.1 DETERMIATION OF RESONANCE FREQUENCY 13 15.2 TEST WITH FORCED VIBRATION 13 15.3 COOLING TEST 14 15.4 EFFECTIVENESS OF FILTERS (TYPE TEST) 14 15.5 TEST ON PROTECTION AND MEASURING METERS.(TYPE AND ROUTINE TEST) 14 15.6 TRIGGER EQUIPMENTS TEST (TYPE TEST) 14 15.7 INSULATION RESISTANCE & DIELECTRIC TEST (TYPE & ROUTINE TEST) 15 15.8 LIGHT LOAD (TYPE & ROUTINE TEST) 15 15.9 RATED CURRENT LOAD TEST (TYPE & ROUTINE TEST) 15 15.10 TEMPERATURE RISE TEST (TYPE TEST) 15 15.11 POWER LOSS DETERMINATION (TYPE TEST & 5% LOT SIZE) 16 15.12 SHORT CIRCUIT TEST (TYPE TEST & 5% LOT SIZE) 16 15.13 LOAD BREAK TEST (TYPE TEST) 16

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15.14 INPUT UNDER VOLTAGE, OVER VOLTAGE & TRANSIENT TEST (TYPE TEST) 16 15.15 ACOUSTIC NOISE MEASUREMENT

(TYPE TEST &5% LOT) 17 15.16 VISUAL INSPECTION (TYPE & ROUTINE TEST) 17 15.17 PERFORMANCE TEST (TYPE & ROUTINE TEST) 17 15.18 EARTH FAULT (TYPE & ROUTINE TEST) 17 15.19 MEASUREMENT OF INPUT RMS RIPPLE 18 15.20 DRY HEAT AND DAMP HEAT TEST 18 15.21 TEST FOR POWER SUPPLY 18 15.22 TEST FOR WATER PROOFNESS 18 15.23 ACCEPTANCE TEST 18 15.24 PRE-COMMISSIONING AND COMMISSIONING TEST 18 15.25 MARKING 19 16.0 GUARANTEE 19 17.0 SPARE AND MAINTENANCE MANUAL 20 18.0 INFORMATION TO BE SUBMITTED 20 19.0 APPROVAL OF DESIGN/DRAWINGS 21 20.0 INSPECTION AND TESTING 21 21.0 FAILURE DURING WARRANTY PERIOD OR UNDER MAINTENANCE CONTRACT 21 22.0 FINAL ACCEPTANCE 21 23.0 TRAINING 22 24.0 SERVICE ENGINEERS 22 25.0 WITHDRAWL OF APPROVAL 22 DATA TO BE FURNISHED BY THE TENDERER ANNEXURE-1

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