UPS - 2x85kva manual - Dubas.pdf

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

2x85kva Parallel Redundant UPS System

1

dubas

dubas

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

CONGRATULATION

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With

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Power

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Electronics of

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Industry.

technologies

and

understanding the importance of UPS in a critical automated environment, we have built our products to

provide

commerce. industry

reliability

dubas over

is a

been

decade

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in and

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and

electronics done

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pioneering works in power electronics. dubas is an ISO

9001

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Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

Operational & Instructional Manual For 2x85kVA Parallel Redundant UPS System

This

DESCRIPTION

: 2 x 85 KVA, 3φ - 1φ ON-LINE UPS

RATING

: 2 x 85 KVA, 3φ - 1φ

INPUT

: 415 V AC, ± 10%,

OUTPUT

: 230 V AC, ± 1%, 50HZ

DC VOLT

: 268V

UNIT SL #

:

W.O.NO

: 1301001

manual

is

accompanying

the

above-referred

product,

which

has

been

manufactured in accordance with the customer purchase order, conforming to dubas quality systems for manufacturing quality. The operating procedure, maintenance, installation, trouble shooting in the event of fault occurrence has been given in this manual. Electrical hazards given in this manual must be understood and strictly followed otherwise it could prove fatal. Please refer to warranty certificate for warranty cover details.

PLEASE READ THE MANUAL THOROUGHLY, BEFORE OPERATING THE SYSTEM. 3

dubas

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

Table Of Contents Un-interrupted Power Supply (UPS) 1.0

System Description

----------

5

2.0

Technical Specification

----------

7

3.0

Drawings Single line diagram

----------

09

General arrangement

----------

10

Room layout diagram

----------

11

Interconnection power wiring diagram

----------

12

Interconnection control wiring diagram

----------

12

System power wiring

----------

13

4.0

5.0

Installation & Commissioning General

----------

15

Installation

----------

16

Commissioning

----------

18

Functional Checks

----------

19

Controls

----------

20

Indications and Alarms

----------

21

Indications, Controls

6.0

Display at UPS

----------

23

7.0

Routine Maintenance for UPS

----------

25

----------

25

----------

29

8.0 9.0

Trouble Shooting For UPS Failure Report

10.0 Warranty Details

----------

30

11.0 Quality Policy

----------

31

12.0 Electrical Supply Better Way

----------

31

13.0 Product Varieties

----------

32

14.0 Bill of materials

----------

33

4

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

1.0 SYSTEM DESCRIPTION Double conversion, Online Uninterruptible power supply here after known as UPS provides emergency back-up power in the event of a black-out and also protects the electrical and electronic equipment from critical power disturbances such as spikes, noise, sags and surges. The main objective of GX-III Series UPS is to take polluted, fluctuating and erratic electrical power that exists in the main power supply today and replace it with well regulated, computer grade power. The back-up time is a function of the amount of battery reserve that is available along with the system. The whole unit consists of 2 nos. of GX-III Series UPS systems, a SW Cubicle and one number of servo stabilizer. The whole system operates in Parallel mode. Operating Modes During Normal operation two units will be paralled and feed the load. (ie 50% each and 85 kva total ) On failure of AC input supply, the inverter will obtain the power from battery and continues to feed the load without disturbance at the load. The battery will supply back up power to Inverters for a specified period. On power resumption the converter output voltage gradually builds to the set value and recharges the battery simultaneously feeding the inverters. If any one of the ups goes fault, the second unit will take the load. After clearing the fault the rectified inverter gets paralled and share the load equally. On Failure of both inverters the load will be transferred to Static bypass source. The retransfer of load from static bypass source to Inverter shall be done by automatically. Note: 1) There is no common battery bank for the ups system. For periodic UPS maintenance or for rectification of fault, Manual bypass switch is provided to bypass the UPS and to feed the power to load from bypass source; this operation is achieved without load break.

The UPS System consists of essentially 5 blocks.

5

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

• CONVERTER • BATTERY CHARGER / BUCK CONVERTER • INVERTER • BOOSTER • STATIC BYPASS

A. CONVERTER Input Voltage is connected to the rectifier module configured by IGBTs, which is controlled by DSP with active Power Factor Correction. The IGBTs are switched ON / OFF by means of gate pulses generated by the DSP control card. Output of the IGBT Bridge; is connected to parallel bank of DC capacitors. Input active Power Factor Controller circuit maintains the input power factor near to unity and the input current pattern exactly follows the input voltage .DC output, line voltage & line currents are sensed by signal conditioning network in Control PCB & then given to the analog inputs of the DSP. Bonded on the feedback, the gate pulse is varied within the DSP, which controls & regulates the DC voltage along with power factor correction. This well-regulated DC output from 3ph-IGBT Bridge, is connected to the capacitor bank. The Converter control logic is fully software based & is performed by World’s leading Digital Signal Processor. Converter Control card which is a combination of analog and a digital card generates the sine weighed pulses, whose width is modulated as per the feed back signals. The input current is sensed via Hall Sensor. The output of converter is supported to inverter and battery charger / buck converter. All the input parameters of the converter are directly displayed on to the LCD screen provided in the front panel.

B. BUCK CONVERTER The output of the converter is connected to the buck converter. The function of this module is step Down the dc voltage to required battery voltage. Output of this module is connected to the battery to Charging purpose. Battery charging current is sensed through hall sensor and is connected at the Output of this module. Battery float & boost mode of working is decided by this current sensor. Normally battery is charging under float mode by constant voltage and current limit. The voltage and 6

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

Current feedbacks are sensed through Digital signal processor. The control logic of this Operation is Fully software based. The battery float charging and boost charging voltage is setted as per battery Float and boost Charging voltage recommended by manufacturer. In this unit we setted float voltage As 248V (Number of cell X float volt per cell. i.e.110X2.25=248V) and boost Voltage as 303V (number Of cell X boost volt per cell. i.e.110X2.75=303V). The float charging current setted as 10% of the Battery AH i.e. 65A and is adjustable 5-65A. Boost charging current normally setted as 5% of the Battery AH i.e. 32A and is adjustable 5-65A. Battery boost charging ENABLE/DISABLE option is Given in the setting. The charging current is limited to the specified value by using the current Feedback through a current sensor provided in the battery path. The excessive demand of battery Current is reduced by bringing down the dc o/p voltage using the DC Fold back action as per the Signals from the current sensors at the battery charging path. All the DC (battery) parameters are Directly displayed on to the LCD screen provided in the front panel.

C. INVERTER DC output of the converter is the input to the 1ø bridge configured Inverter.

The output of the

inverter bridge is isolated by output transformer. Harmonic voltages are filtered by output filter capacitor. IGBT’s are switched ON and OFF as per the pulses from driver cards, received at their gate terminals. IGBT’s Q1 to Q4 are switched ON and OFF as per the driver pulses received at their basis from driver card. The inverter control logic is software based & is performed by worlds leading Digital Signal Processor. Inverter Control card which is a combination a analog and a digital card generates the sine weighed pulses, whose width is modulated as per the feedback signal. The output current is sensed via current transformers. Indications and alarms are generated for announcing the status of the system. All the output parameters and the fault status of the UPS are directly displayed on to the LCD screen for user information.

D. BOOSTER 7

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

During failure of AC mains supply, this module supports the inverter using the battery voltage without disturbed the load. Input for this module is from battery. The function of this module is boosting the battery voltage to required input voltage for the inverter. Discharging current is sensed through hall sensor, which is located at this module.

E. STATIC BYPASS If load is on inverter and bypass source is in healthy condition, then load will transfer to bypass source, if inverter is tripped. If load is connected to bypass source and Ups is healthy, then output load will retransfer to inverter automatically. For maintenance work of UPS, UPS is bypassed to bypass source through Manual Bypass Switch, so that maintenance work can be done on ups panel.

2.0 TECHNICAL SPECIFICATION Sl. UPS PARTICULARS/SPECIFICATION No GENERAL 1.0 Make & Country 2.0 Type 3.0

4.0

Input
Voltage
No. of Phase
Frequency
P.F UPS Capacity At 0.8 PF

5.0 6.0

Output Voltage and regulation Frequency and regulation

7.0

Metering

‘DUBAS’ INDIA Double Conversion Online 415V, ±10% 3ø, 5wire (3P+N+Earth) 50Hz. ±5% > 0.9 at rated load 68KW 1ø, 230V AC, ± 2% 50 Hz ± 0.5%

Type Accuracy

8.0 Type of cooling CONVERTER 1.0 Type

LCD (32 Bit display) with operating key pads ±2% Forced Air Constant voltage current limit type

2.0

Type of Control

3.0 4.0 5.0

Input voltage output Voltage Voltage Regulation for AC Input Variations of + 10% & Load Variations Ripple

6.0

DATA

8

DSP Based PWM Technology 415V+ 10% 400 VDC + 1% < 2%

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system 7.0

Power Walk-in circuit provided

dubas

Yes

BATTERY CHARGER/BUCK CONVERTER 1.0

Type

Constant voltage current limit type

2.0 3.0

Type of Control Input voltage

DSP Based PWM Technology 400 VDC

4.0

Nominal Output Voltage
Float Voltage
Float Current
Boost voltage
Boost current

248 VDC 248V 65A Factory set 303V 90A starting current 45A finishing current

5.0

+2%

6.0

Voltage Regulation for Input Variations & Load Variations Ripple

7.0

Power Walk-in circuit provided

Yes

< 2%

INVERTER SYSTEM 1.0

Type

Solid state, static control, using IGBTs

2.0

Type of Control

DSP Based PWM Technology

3.0

Input

400V DC

4.0

Output AC voltage

1ø, 230V AC

5.0

Accuracy (Steady State)

Better than 98%

6.0

Output Frequency

50 Hz @ free running condition

7.0

Frequency regulation

+ 0.5%

8.0 9.0

Harmonic Distortion Transient Voltage For
50% step load change
Sudden input voltage change of ± 10%
Loss and return of input AC power

< 3% on 100% linear load

TRANSIENT RECOVERY TIME
Recovery to 95% BOOSTER 1.0 Type 2.0 Type of Control

± 5% ± 5% ± 5% 100% to 110% 60 minutes OL1 > 110% to 125% 10 minutes OL2 > 125% to 150% 60 seconds OL3 > 150% < 1sec. OL4

50 40 30 20 10 0 1.04

1.10

1.16

1.22

1.28

1.34

1.40 1.46 Load Current x In

Fig-11: Overload Chart for UPS LIST OF ALL POSSIBLE ERROR / TRIP MESSAGES GIVEN THROUGH INTERNAL DISPLAY Error Displayed

Error Description

Action to be taken

“Inverter Output Under Voltage” trip.

Press RESET switch, If problem

The UPS output has dropped below the set

persists

voltage level.

Authorized service personnel.

“Inverter Output Over Voltage” trip.

Press RESET switch, If problem

The UPS output has risen above the set

persists

voltage level.

Authorized service personnel.

INVERTER INVERTER TRIP UV

INVERTER TRIP OV

inform

inform

to

to

the

the

Switch OFF inverter, allow the INVERTER TRIP BI

“DC bus LOW” trip

battery to get charged, press

This indicates that the battery has fully

reset switch and switch ON

given up its backup power.

inverter.

If

call dubas.

28

problem

persists

dubas

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

INVERTER TRIP BH INVERTER TRIP OL1 OL2 OL3 OL4 A L A R M FO R OL A L A R M FO R

“DC bus HIGH” trip

Press RESET switch, If problem

This indicates that the DC bus voltage is

persists

beyond the specified limit.

Authorized service personnel.

“Inverter Over Load or Over current” trip. This indicates that the Inverter Output current/ power has exceeded its rated value. (refer Fig-11)

inform

to

the

Load has to be reduced. Press reset If problem persists call dubas.

Load has to be reduced. Then Inverter is overload for OL1/2/3

alarm

&

countdown

stops

automatically. Battery is discharged to its end cell cut-Off

Ensure load is switched OFF or

voltage

input source is restored.

Error Description

Action to be taken

“Input Over Voltage” trip.

Wait till the Input source is

CONVERTER TRIP

This trip occurs when the Mains supply is

healthy. Press RESET switch, If

AC OV

above the specified window (Above 10%

problem persists inform to the

of the nominal input voltage)

Authorized service personnel.

BL

Error Displayed CONVERTER

CONVERTER TRIP AC UV

CONVERTER TRIP OC

CONVERTER TRIP DC OV

Wait till the Input source is

“Input Under Voltage” trip. This trip is due to the low input voltage (Below 10% of the nominal input voltage)

healthy. Press RESET switch, If problem persists inform to the Authorized service personnel. If it happens frequently, then

“Input Over Current” trip. This indicates that the line current is more than the rated current of the system.

check the Inverter load & check input

voltage.

If

problem

persists contact dubas

“DC Over Voltage” trip.

Press RESET switch, If problem

This indicates that the DC voltage has

persists

raised above the specified level.

Authorized service personnel.

“DC Under Voltage” trip. CONVERTER TRIP

This indicates that the DC voltage has

DC UV

fallen below the specified value of the Converter.

29

inform

to

the

Check the DC bus voltage OR this can happen even during short circuit.

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

Glossary UPS

: Un-interrupted Power Supply

IT

: Isolation Transformer

Inv.

: Inverter

Conv. : Converter

9.0 FAILURE REPORT All failures to be reported to Service Department, DUBAS ENGINEERING PVT. LTD

Before reporting a complaint call, check the following. 1. Input breaker ON. 2. Battery MCCB ON. 3. Output Distribution is OK. 4. No excessive or faults loads are connected.

While reporting a faulty; please inform, 1. Nature of fault 2. Indication on the, front panel. 3. Serial number of the unit / rating of the unit / date of installation / location / premises / name of the contact person.

Please register your call at the following address

DUBAS ENGINEERING PVT. LTD., # 43(P) 2nd Phase, Electronics City, Hosur Main Road Bangalore - 560 100 Phone: (080) 4033 6000 Fax: (080) 4033 6222

30

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

10.0 WARRANTY DETAILS dubas engineering pvt. Ltd. warrants its products against all manufacturing defects, faulty workmanship for a period of 12 months from the date of Invoice, subjected to the terms and condition mentioned below.

TERMS AND CONDITIONS 1. The customer will notify the company promptly of any defects noticed and give the company adequate opportunity to inspect Test, and remedy them, for which the customer will deposit the goods if necessary with company’s office/service center along with original invoice. 2. Inspections and Test Report of the Company/Service Center will be final and binding under the warranty for determining defects, repairs/ alterations required or carried out or certifying working of goods thereafter. The company is entitled to retain any defective parts replaced under the warranty. 3. The company’s liabilities under the warranty will be limited only to defects, which occur under. 4. Conditions of normal operations and proper use. It excludes defects occurring because of abuse, faulty care, or maintenance repairs/ alteration to goods or parts by unauthorized persons, use under conditions beyond specified or damage caused by lightening. 5. In case Batteries are used along with our system the responsibility to do regular maintenance of the batteries lie with the customer. Customers are required to maintain the batteries under optimum working conditions as specified by the battery manufacturer’s certification that the batteries are well maintained. 6. Our warranty or any other services is limited to manufacturing defects in the equipment only.

31

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

11.0 QUALITY POLICY We shall strive continually to be a dedicated team delivering UN compromised quality products and services, befitting and be-timed value to accomplish highest customer satisfaction.

12.0 ELECTRICITY SUPPLY – BETTER WAY At any moment an AC mains supply can be subjected to the electrical disturbances such as spikes (usually lightning induced), electrical noise (flashes on monitors and TV screens), sags (lights go dim), surges (lights go bright) and blackouts or complete loss of power. 1. Blackout – Blackouts can be caused by excessive demand on the power grid, lightning storms, equipment failure or any accident, which brings down a power line. 2. Sag or Brownout – Sags or brownouts can be caused by heavy equipment coming on-line, short circuits, undersized electrical circuitry, or when the utility company deliberately decreases voltage levels in order to cope with peak load times (rolling brown outs). Brownouts usually occur during the summer heat waves. 3. Spikes – Spikes are generally caused by a nearby lightning strike, or if utility power lines are downed in a storm or as a result of an accident. 4. Surge – A surge is usually caused when high-powered appliances in the area are turned off. Short circuits or undersized electrical circuits can also cause them. 5. Noise – Lightning, load switching, generators, transmitters, transformers, and industrial equipment can cause EMI and RFI noise.

These electrical disturbances will damage sensitive electrical / electronic equipments, unscheduled Power shutdown, corruption of data, system hangs ups etc. These disturbances can be prevented and it comes in the form of Uninterruptible Power Supply (UPS).

32

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

dubas

13.0 PRODUCT VARIETIES

1.

UPS SYSTEMS:

DU-Series are available from 1 KVA to 120KVA range GX-Series are available from 6KVA to 480KVA in single modules. Seamless paralleling up to 6 modules are possible in the GX-Series. DUBAS UPS Systems are employed in thousands of mission critical applications in Data Centres, Hospitals, Avionics, Critical Railway applications etc.

2.

INDUSTRIAL STABILIZERS:

Industrial Voltage Stabilizers are available from 1KVA to 1200KVA. Air cooled versions are available up to 250KVA and Oil cooled versions are available up to 1200KVA Dubas Stabilizers are deployed in various countries in critical applications safeguarding various critical loads from voltage uncertainties.

3.

FREQUENCY CONVERTERS:

Frequency converters are available up to 200KVA rating with various voltage configurations. dubas is a premier supplier of 60HZ or 400HZ Frequency converters for critical test laboratories and avionics industry.

4.

DC POWER PLANTS:

Dubas manufactures entire range of thyristor based rectifiers / chargers up to 900 Amps in various voltage configurations. Major users include Power Substations, Process Plants, and Telecom Networks etc.

5.

ULTRA ISOLATION TRANSFORMERS:

Ultra Isolation Transformers are available from 1KVA to 200KVA range in air-cooled version; the equipments can be configured for any specified voltage configurations. These transformers provide ultimate isolation parameters for critical loads against switching spikes, surges and any electrical ground noise.

33

dubas

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

14.0 MAJOR BILL OF MATERIALS Sl. No

Item Description

Specs / Cat No.

1.

INPUT TXM MODULE

2.

Legend

Qty

ONU-31/85/268/GX3-ITTP

----

1

INPUT CHOKE MODULE

ONU-31/85/268/GX3-CHL

---

1

3.

SOFTSTART MODULE

ONU-31/85/268/GX3-SSM

----

1

4.

CON BRIDGE MODULE

CONV/3FC/85I/268/GX3-CBM

----

1

5.

CAPACITOR MODULE

ONU-31/85/268/GX3-CM

----

1

CONVERTER

6.

BUCK CON MODULE

ONU-31/85/268/GX3-BCM

----

1

7.

MAIN CONTROL CARD MODULE

ONU-31/85/268/GX3-MCCM

----

1

8.

POWER SUPPLY MODULE

ONU-31/85/268/GX3-PSM

----

1

9.

FAN POWER SUPPLY MODULE

ONU-31/85/268/GX3-FPSM

----

1

10.

LCD DISPLAY

DU3013R1

--

1

11.

INDICATION CARD

DU2036

PCB 20

1

12.

SPACE HEATER

80W 230V AC

SPH

1

13.

SOCKET

6A 3PIN 240V AC

SKT

1

14.

CFL LAMP WITH HOLDER

11/12W, 230V AC

LAMP

1

15.

DOOR SWITCH

6A, 230V AC

DS

1

16.

COOLING FANS

3” 24V DC

F1,F2,F3,F5

27NOS

17.

COOLING FAN

4” 240V AC

F4

1NO

18.

EXHAUST FAN

6” 240V AC

--

5NO

INVERTER

19.

TXM & FILTER MODULE

ONU-31/85/268/GX3-ITSP

----

1

20.

STATIC MODULE

ONU-31/85/268/GX3-SM

----

1

21.

INV BRIDGE MODULE

ONU-31/85/268/GX3-IBM

----

1

22.

BOOSTER MODULE

ONU-31/85/268/GX3-BM

----

1

23.

CAPACITOR MODULE

ONU-31/85/268/GX3-CM

----

1

24.

MAIN CONTROL CARD MODULE

ONU-31/85/268/GX3-MCCM

----

1

25.

POWER SUPPLY MODULE

ONU-31/85/268/GX3-PSM

----

1

26.

FAN POWER SUPPLY & PARALLEL BLOCK MODULE

ONU-31/85/268/GX3-FPSPBM

----

1

27.

SPACE HEATER

80W 230V AC

SPH

1

28.

SOCKET

6A 3PIN 240V AC

SKT

1

29.

CFL LAMP WITH HOLDER

11/12W, 230V AC

LAMP

1

30.

DOOR SWITCH

6A, 230V AC

DS

1

31.

COOLING FANS

3” 24V DC

F7-F9

29NOS

32.

COOLING FAN

4” 240V AC

F6,F10

2NO

33.

EXHAUST FAN

6” 240V AC

--

5NO

M1-M2

2

M3

1

M4-M6

3

SWITCHING CUBICLE

34.

INPUT MCCB FOR UPS

35.

INPUT MCCB FOR SCVS

36.

BATTERY MCCB

200 A, TP, 415VAC T3S 250 FF TMD R200 ISDA051268R1 (50 KA ) 250A, TP, 415VAC 50KA, T3S250FF TMD R200,1SDA051269R1) 400A, 3P, 500V DC, T5N 400FF TMA R400 34

dubas

Operational & Instruction Manual for 2x85kVA Parallel Redundant UPS system

37.

UPS OUTPUT MCCB

38.

STATIC / BYPASS INPUT MCCB

39.

MANUAL BYPASS MCCB

40.

SPACE HEATER

41.

SOCKET

42.

400 A, 3P, 415VAC T5N 400FF TMA R400 400 A, 3P, 415 VAC T5N 400FF TMA R400 400 A, 3P, 415 VAC T5N 400FF TMA R400

M9-M10

2

M7-M8

2

M11

1

80W 230V AC

SPH

1

6A 3PIN 240V AC

SKT

1

CFL LAMP WITH HOLDER

11/12W, 230V AC

LAMP

1

43.

DOOR SWITCH

6A, 230V AC

DS

1

44.

BUCK BOOST TRANSFORMER

SCVS/11/85/00-ITSP

BB1&BB2

2

45.

SENSING TRANSFORMER

DU-SVS-SENS-01

ST1

1

46.

ISOLATION TRANSFORMER

IT-31/85/00/TX-F

47.

VARIAC

60A 2COIL A/C TYPE

48.

MOTOR

49.

SCVS (BYPASS PANEL)

TXM3

1

VR1&VR2

2

220 V, 1φ, 50Hz, 60 RPM, 10 Kg – cm

---

1

COOLING FAN

6”, 230V AC

---

6

50.

EXHAUST FAN

6” 240V AC

--

5NO

51.

INPUT METER

3 ½ DIGITAL (VAF 3φ)

M1

1

52.

OUTPUT METER

3 ½ DIGITAL (VAF 1φ)

M2

1

53.

CONTACTOR

115A TP AC

CR3

1

54.

CONTROL CARD

DP-01 DP-001 M0 0

---

1

55.

SPACE HEATER

80W 230V AC

56.

CFL LAMP WITH HOLDER

11/12W, 230V AC

57.

SOCKET

58.

DOOR SWITCH

Sl.No ITEM DESCRIPTION

SPH

1

LAMP

1

6A 230V AC

SKT

1

6A, 230V AC

DS

1

MAKE

1

MAGNETICS

DUBAS

2

SWITCHGEAR / MCCB

SCHNEIDER / ABB / L & T / SEIMENS

3

PCA

DUBAS

4

CAPACITOR

SARDA / ALCON / RESCON / KENDEIL

5

COOLING FAN

HICOOL / NISIKI / SUNON

6

IGBT

SEMIKRON/FUJI/INFINEON/ MITSUBISHI

7

ENCLOSURE

DUBAS

8

BATTERY

EXIDE

9

VARIAC

RADIOTONE

10

SERVO MOTOR

PRECISSION / ALL-STEP

11

METER

EIC

35