tm-760 101380 revised 121080 revised 101586 operation …revised 101586 operation and maintenance...

TM-760 101380

Revised 121080 Revised 101586

OPERATION AND MAINTENANCE MANUAL TM-760

with

Illustrated Parts List

for

PART NO. 430538A

STATIC VOLTAGE REGULATOR

HOBART BROTHERS COMPANY POWER SYSTEMS DIVISION

TROY, OHIO 45373 U.S.A.

ELECTRIC SHOCK can kill. Do not touch live electrical parts.

ELECTRIC ARC FLASH can injure eyes burn skin ignite combustible materia i.

cause equipment damage and Do not use power cabies to

break 1 ad and prevent tools from causing short circuits. 7

/

IMPROPER PHASE CONNECTION, PARALLELING, OR USE can damage this and attached equipment.

IMPORTANT: - Protect all operating personnel. Read, understand, and follow, ' all instructions in the Operating/Instruction Manual before

A.

B.

installing, operating, or-servicing the equipment. available for future use by all operators.

Keep the manual

Equipment that supplies electrical power can cause serious injury or death, or damage to other equipment or property. The operator must strictly observe all safety rules and take precautionary actions. Safe practices have been developed from past experience in the use of power source equipment. While certain practices below apply only to electrically-powered equipment, other practices apply to engine-driven equipment, and some practices to both.

SHOCK PREVENTION

Bare conductors, electrically-live

or terminals in the output circuit, or ungrounded, equipment can fatally shock a person. Have a certified

electrician verify that the equipment is adequately grounded and learn what terminals and parts are electrically HOT. Avoid hot spots on machine. Use proper safety clothing, procedures, and test equipment.

The electrical resistance of the body is decreased @hen wet, permitting .dan erous

4 currents to flow through it. When inspecting or servicing

ez;; z;E;t, do not work in damp areas. Stand on a dry rubber mat or use insulating gloves when dampness or sweat cannot be avoided.

Keep clothing dry, and never work alone.

1. Installation and Grounding of Electrically Powered Equipment ,

Equipment driven by electric motors (rather than by diesel or gasoline engines) must be installed and maintained in accordance with the National Electrical Code, ANSI/NFPA 70, and other applicable codes. A power disdonnect switch or circuit breaker must be located at the equipment. Check the nameplate for volta e, frequency, and phase requirements. If only 3-phase power is availab e, f connect any single- hase rated equipment to only two wires of the 3-phase line. DO NOT CONNE T E the equipment grounding conductor (lead) to the third live wire of the 3-phase line, as this makes the equipment frame electrically HOT, which can cause a fata? zil=imK.- P---P

Alwa to t x

s connect the grounding lead if supplied in a power line cable, e grounded switch box or building ground.

separate groundin B lead.

If not provided, use a Ensure that the current

of the grounding (am erage)

situation. ead will be adequate for the worst 8

capacity ault current

details. Refer to the National Electrical Code ANSI/NFPA 70 for

Do not remove plug ground prongs. Use correctly mating receptacles.

2. Output Cables and Terminals

Inspect cables frequently for damage to the insulation and the connectors. Re lace or repair cracked or worn cables immediately. i Do : not overload ca les. K energized.

Do not touch output terminal while equipment is /

3. Service and Maintenance

.-. . ..~‘-.-..-----Tkis-~u.~e-~-~~-~-~n~~~.d-i~--g~~~l~~~~~~~-and-~e.chanic=-~-.-----’ condition to avoid hazards stemming from disrepair. Report any !

to the supervisor and discontinue s afety-Fas‘begn .a .-sur-.a; I.-. *xpsi jr~ --..-. ._-~..--, I \ _. ._ ̂. "- ,-_ personnel only. --_---.-- 1..... ...__I_ .._..__ - _.___,. -:

Instruction 910082 Feb 25186 Revised

Page 1

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P. 1

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Fi ma UTl

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-- ~ftffE&N~~.,,S--- -A. - - -.._ _____ *___ ,.-- I__ .s ec a

h- .". .Tep" a- &l.- P t IL f-Eecautlonaq i aDels On the equirnt mon-t-~~yL_;..~.~d_er and bels that cannot be easily rea .__, i _

Page 2 Instruction 910082 Revised Feb 25186

b. Lock switch OPEN (or remove line fuses) so that power cannot be turned ON accidentally.

c. Disconnect power to equipment if it is out of service.

d. If troubleshooting must be done with the unit ener ized, have another person present,who is trained in turning o P 'and providing or callfmg for first aid.

f the equipment

E AND EXPLOSION PREVENTION

e and explosion are caused by electrical short circuits, combustible erial near engine exhaust pi

!I ing, misuse of batteries and.fuel, or

afe operating or fueling con itlons.

Electrical Short Circuits and Overloads

Overloaded or shorted equipment can become hot enough to cause fires either by self destruction or causing nearby combustibles to ignite. For electrically-powered equipment, in particular,

3 rovide primary

input protection to remove short circuited or heave y overloaded , equipment from the line.

Batteries

Batteries may explode and/or give off flammable hydro en and arcing from a ruptured battery can cause fires an i adgF;onz;e acid failures. When servicing, do not smoke, cause sparking, or use open flame near the battery.

Engine Fuel

Use only approved fuel container or fueling system. Fires and explosions can occur if the fuel tank is not grounded prior to or during fuel transfer. completely fill

Shut unit DOWN before removing fuel tank cap. Do not tank,

expansion overflow. because heat from the e uipment may cause fuel Remove all spilled fuel 4

that penetrates the unit. After clean-up, MMEDIATELY, including any

fumes away with compressed air, open equipment doors and blow

IC FUME PREVENTION

bon monoxide - Engine exhaust fumes can kill and cause health problems. e or vent the exhaust fumes to a suitable exhaust duct or outdoors. er locate engine exhausts near intake ducts of air conditioners.

ILY INJURY PREVENTION

ious injury can result from contact with fans inside some equipment. t DOWN such equipment for inspection and routine maintenance. When ipment is in o eration use extreme care in doing necessary troubleshooting; adjustment. E o not remove guards while equipment is operating.

ICAL AND FIRST AID TREATMENT

st aid facilities and a qualified first aid person should be available each shift for immediate treatment of all injury victims. Electric ck victims should be checked by a ph sician and taken to a hospital ediately if any abnormal signs are o served. %

EMERGENCY FIRST AID

1 physician immediately. Seek additional assistance and use First Aid j hniques recommended by American Red Cross until medical help arrives.

i BREATHING IS DIFFICULT give oxy en, n. FOR ELECTRICAL SHO&K, turn o f power. Remove victim; if not f

if available, and have victim lie

athing, begin artificial respiration, preferably mouth-to-mouth. If detect&.~, begin external heart massage. Call Emergency ad immediately. - -

CHAPTER/

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OPERATION AND-ANCE MANUAL TM-760 STATIC VOLTAGE REGULATOR, PART NO. 430538A

LIST OF EFFECTIVE PAGES

i 6 DATE

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I 1 OPERATION AND MAINTENANCE MANUAL TM-760

STATIC VOLTAGE REGULATOR, PART NO. 430538A

TABLEOFCONTENTS

SUBJECT CHAPTER/SECTION

DESCRIPTIONlOPERATION l-l

INTRODUCTION l-l

DESCRIPTION l-2

INSTALLATION AND PREPARATION FOR USE l-3

OPERATION l-4

MAINTENANCE 2-l

DESCRIPTION AND OPERATION 2-l

TROUBLESHOOTING 2-2

REMOVAL AND INSTALLATION 2-3

ADJUSTMENT AND TEST

INSPECTION AND CHECK

CLEANING AND PAINTING 2-6

REPAIR 2-7

ILLUSTRATED PARTS LIST 3-l

2-4

2-5

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Ott 13180 Contents

Page II2



CHAPTER 1. DESCRIPTION/OPERATION

SECTION 1. INTRODUCTION

1. Scope , i 4

This manual contains information and instructions for a Static Voltage Regulator, manufactured by Hobart Broth- ’

ers Company, Power Systems Division, Troy, Ohio 45373, U.S.A.

An illustrated parts list is contained in Chapter 3.

2. Puroose

The purpose of the manual is to provide operators and maintenance personnel with instructions and information

which will guide and assist them in the efficient operation and maintenance of this equipment.

3. Revisions to Manual

Revised or added information in the manual is indicated by a solid black line in the left-hand margin opposite the

new material.

4. Customer Service

If you have any questions concerning your Hobart Power Systems Division equipment, you are invited to contact

our Service Department by mail, telephone or TWX.

Write: Hobart Brothers Company Power Systems Division

Service Department Troy, Ohio 45373

U.S.A.

Call: Area Code (513) 339-6011

TWX : 81 o-456-2907

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Page II2

i’, ’

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SECTION 2. DESCRIPTION

1. Unit Assembly t ‘I

A. The 430538A voltage regulator (Fig. 1) is designed primarily for use with the higher voltage output generator

sets which are operated in parallel and which require voltage droop compensation, but do not require line drop

compensation. The regulator provides 1% voltage recovery time for all loads up to 100% of rated load on a three-phase, four-wire, 400-Hz brushless alternator. It provides field excitation power for a rotary exciter and

regulates alternator voltage by varying the exciter field power as required to meet varying alternator load con-

ditions to hold the alternator voltage constant. The maximum continuous rating of this regulator is 4.9 amperes at 125 volts DC.

8. The voltage regulator consists of seven basic, interconnected circuits. They are:

(1) Voltage detection circuit

(2) Voltage comparison circuit

(3) Transistorized pre-amplifier

(4) Power stage full-wave single-phase magnetic amplifier

(5) Damping circuit

(6) Droop circuit

(7) Voltage build-up circuit

C. Any deviation of the alternator voltage from its set, regulated level is sensed by the voltage detection and comparison circuits. A signal is fed from the comparison circuit into the transistorized pre-amplifier, amplified, and

used to drive the magnetic amplifier. The magnetic amplifier output changes in response to this signal, chang-

ing the field power of the rotary exciter enough to return the alternator voltage to its regulated value. The

voltage at which the alternator is regulated may be adjusted with the voltage adjustment rheostat (2).

D. Three-phase, 115-V, 400-Hz operating power is supplied by the generator set alternator. When the regulator

is used on 115/200-V machines, power is routed directly from alternator output to the regulator. When used

on higher voltage machines such as the 575-V unit, power is supplied through a three-phase transformer.

2. Components

Refer to Figure 1. Components of these basic circuits are mounted in two major subassemblies which are the droop

chassis assembly (6), and the sensing and pre-amplifier chassis assembly (15). Receptacle connectors (7, 9, and 11)

provide quick connect-disconnect facilities for interconnecting wire leads. The two subassemblies are mounted on

a chassis (18) along with other main components of the regulator, which include a resistor (I), voltage adjusting

rheostat (2), fuse (12) and fuseholder (13), nineteen-pin receptacle connector (14), and reactor (17).

Ott 13180 1-2

Page 1

1. Resistor 2. Voltage adjusting rheostat 3. Rheostat mounting bracket 4. Droop circuit ON-OFF switch 5. Droop adjusting rheostat 6. Droop circuit chassis 7. Receptacle connector 8. Damping circuit gain potentiometer 9. Receptacle connector

r 1 OPERATION AND MAINTENANCE MANUAL TM-760


10. Damping circuit rate potentiometer

11. Receptacle connector 12. Fuse

13. Fuseholder 14. Receptacle connector 15. Sensing and pre-amplifier chassis assembly 16. High-phase sensing board assembly

17. Reactor

18. Chassis

1-2

Page 2

Static Voltage Regulator

Figure 1

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3. Detailed Circuit Descriptions

A: Voltage Detection Circuit i 4 I

(I) Refer to Figure 2. This circuit consists of three single-phase transformers (T501, T502, T503); three diodes (CR501, CR502, CR5031 connected as a three-phase, half-wave rectifier; six diodes,(CR504 thru CR5091 connected as three single-phase, full wave center tap rectifiers; and four blocking diodes (CR510

thru CR513). The transformer primaries are connected as a three-phase, four wire Y to the alternator output voltage. The transformer secondaries are center-tapped, with the center taps joined together to form a common negative for the three single-phase rectifier and the three-phase, half-wave rectifier. The

filtered output of each of the single-phase rectifiers is proportioned to a given phase voltage. The output of the three-phase, half-wave rectifier is proportional to the average of the three generator-phase

voltages. The positive outputs of the three single-phase rectifiers are connected to a common point

through blocking diodes (CR51 1, CR512, CR513). Part of the three-phase, half-wave rectifier voltage,

as determined by the ratio of the resistors (R501 and R502) is connected through blocking diode CR510

to this same point. The blocking diodes prevent current flow from one of the four rectifiers into the filter circuit of any other rectifier.

(21 The functions of the voltage detection circuit are to provide a filtered DC voltage proportional to the

alternator voltage and to sense the highest single alternator phase voltage if the phase voltages are not

balanced. The three-phase, half-wave rectifier senses the average phase voltage and the three single-phase,

full-wave rectifiers each sense a single phase. Resistors R501 and R502 are scaled such that the portion

of the three-phase half-wave fed through blocking diode CR510 is slightly higher than the three single-

phase outputs when the alternator phase voltages are balanced. If the three-phase voltages are not equal,

the rectifier voltage corresponding to the highest phase voltage is higher than the average voltage signal.

The output of the voltage detection circuit is thus a filtered DC voltage proportional to the average

alternator phase voltage if the phase voltages are balanced and proportional to the highest phase voltage if the voltages are not balanced.

8. The Voltage Comparison Circuit

(1) The comparison circuit is a simple voltage reference bridge consisting of three fixed resistors (R506,

R508, R509), a potentiometer (R571) and a voltage reference diode (VR501). These components are

connected to form a bridge in which the DC output of the voltage detection circuit is compared to a fixed voltage reference. A voltage proportional to the difference between the reference and the input

voltage to the bridge appears between the slider of the potentiometer and the positive side of the reference diode. This voltage is a function both of the generator voltage and the position of the potentiometer slider.

(2) The function of the voltage comparison circuit is to compare part of the DC output voltage of the de-

tection circuit with a fixed DC reference voltage and derive from their difference a signal suitable for driving a DC amplifier. It is in this circuit that the voltage at which the alternator regulates is establish-

ed. Varying the position of the slider on the potentiometer changes the fraction of the voltage com-

pared to the reference and varies the driving signal of the DC amplifier.

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C. The Transistorized Pre-amplifier

(1) The pre-amplifier consists of two transistors (Q501, Q502); two resistors (R507, R511); a zener diode

(VR502); a “free-wheeling” diode (CR514); and a filter capacitor (C505). These components are con-

nected in a two-stage DC amplifier circuit obtaining power from the three-phase, half-wave rectifier,

of the voltage detection circuit and using the power to drive the control winding of the magnetic amplifier

in response to a signal from the voltage comparison bridge. Resistors (R507 and R511) limit the transistor

currents to safe levels, the filter capacitor keeps the ripple low in the input signal, and the zener diode and

“free-wheeling” diode protect the output transistor from voltage spikes from the reactor control coil.

(2) The transistorized pre-amplifier amplifies the output signal from the voltage comparison circuit and drives

the magnetic amplifier with this amplifier output.

D. The Power Stage Full-Wave Single-Phase Magnetic Amplifier

(1) This circuit consists of a single-phase, full-wave reactor (L505) and a full-rectifier (CR531 thru CR534) connected as a self-saturating magnetic amplifier. The saturable reactor has two load windings (I-2, 3-4) on separate cores and two control windings (5-6, 7-8) linking both cores.

(2) The load windings are connected with the rectifiers in such a manner that only one of the load windings

conducts for each half cycle of alternator voltage. This results in a net DC voltage on each reactor load

winding, causing the reactor cores to saturate in the absence of a control signal. The control winding is

driven with DC power in such a manner to oppose this self saturation, partially or completely desaturat-

ing the amplifier cores in response to the pre-amplifier output.

(3) The magnetic amplifier rectifies AC voltage from the alternator and uses the DC thus obtained to excite

the rotary exciter in response to a control signal from the DC pre-amplifier. The impedance of the re-

actor load windings, in series with the magnetic amplifier rectifier, is varied by the control signal to

control the exciter field power.

E. The Damping Circuit

(1) The damping circuit includes a transformer (T504); a limiting resistor (R510); a variable resistor (R551);

a potentiometer (R572); and two capacitors (C506, C507). The transformer primary is connected to the regulator output through resistors (R510 and R551). The transformer secondary is connected across the potentiometer. That part of the potentiometer between the slider and one end is in series with the in-

put to the transistor pre-amplifier and is filtered by one of the capacitors. The other capacitor connects

from the positive side of the voltage comparison circuit to the potentiometer.

(2) The damping circuit detects changes in the regulator output and feeds energy pulses opposing the changes into the transistor pre-amplifier. The damping circuit affects the transient behavior of the regulated alternator system, preventing hunting, oscillation, and excessive overshoot of the alternator voltage following load changes. The damping rheostat affects mostly the amplitude of the damping signal. The rate

potentiometer affects both phasing and amplitude of the signal. Capacitor (C506) serves to shift the phase of the sensing signal, reducing the system response time.

1-2

Page 4

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OPERATION AND MAINTENANCE MANUAL TM-760 STATIC VOLTAGE REGULATOR, PART NO. 430538A

F. Voltage Droop Compensation Circuit

The purpose of this circuit is !to Insure that the load is shared equally by generator sets connected in parallel and to counteract and eliminate circulating currents between paralleled generator sets.

For any number of reasons, such as slight differences in output voltage, current, etc., one generator

could drive or “motor” another generator connected in parallel (to a common bus) if it were not for the

droop compensation circuit. It may be noted here that the droop circuit is not required and may be turned OFF when the generator set is operated alone.

The droop compensation circuit functions to maintain a field excitation that will produce an output voltage

which is the same as voltage in other paralleled generators.

The droop circuit consists of a current sensing transformer (T17) (which is not a component part of the

voltage regulator and which is located on the generator output “C” phase cable); a rheostat (R552) and

switch (S501) are connected in parallel across the current transformer (T17) output leads; and two single- phase transformers (T505 and T506) which supply a signal to voltage detection circuit transformers (T501

and T502).

In the event that the generator is driving or “motoring” another generator set connected in parallel, the transformer (T17) will sense the reactive component of the load and circulating current. The vectorially

increased transformer signal caused by the reactive load will also be reflected in transformers (T505 and

T506) in “A” and “B” phases.

This increased voltage signal will be sensed by the voltage detection circuit which causes excitation voltage

to the exciter field to be lowered until the load is balanced and no circulating current flows between the

generators.

The amount of voltage droop is approximately 3% for each 100 Amps of reactive load. Droop is adjustable

by the rheostat (R552) which is set at the factory. The voltage droop required to eliminate excessive cir-

culating currents between paralleled generator sets reduces the voitage regulator accuracy by more than

an acceptable amount. To preserve regulator accuracy and allow generator sets in a paralleled operation to

share inductive reactive loads with no decrease in the generator system voltage, crosscurrent compensation (reactive differential compensation) is used.

Cross-current compensation is achieved by cross-connecting secondary leads of current sensing transformers (T17 mentioned above). Signals from current sensing transformers thus connected, cancel each other when

line currents are proportional and in phase. Voitage drop normally caused by the paralleling circuit is eliminat-

ed and regulator accuracy is maintained.

When a single generator set is used in an installation with no thought of paralleling, the droop compensation

switch (S501) should be placed in OFF position.

When generator sets are used in a paralleled installation, the switch must be in ON position at all times. Droop

compensation is turned OFF automatically by components in the generator set when it is operating alone in a

paralleled installation.

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1-2

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i ‘I

485320

Voltage Regulator Schematic Diagram

Figure 2 Ott 13180

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G. The Voltage Build-Up Circuit

The voltage build-up circuit c& ‘% SI ts of a relay (K501) with normally closed contacts connected across the

load windings of the power reactor and a resistor (R512) in series with the relay coil. When the machine is

first started, the alternator voltage from residual magnetism is applied through the relay contacts and the mag-

netic amplifier rectifier to the exciter field circuit. This causes the exciter voltage to increase and makes the

alternator voltage build up. When the alternator voltage rises high enough to power the regulator, the relay

coil, connected to the voltage detection circuit, is energized. This actuates the relay and opens the normally

closed contacts shunting the reactor load coils, allowing the magnetic amplifier to control the exciter field power.

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SECTION 3.j liNSTALLATlON AND PREPARATION FOR USE

1. Installation

A. General

(I ) This voltage regulator is designed primarily for drawer type mounting, however it is not attitude sensitive and may be mounted in any position without affecting its operation. In some installations it is mounted in what appears to be a backward position which may make reading of the cable compensation adjusting, instruction plate somewhat difficult.

(2) The regulator does not dissipate large amounts of power, but certain components need a reasonable amount of air for convection cooling. For this reason, the regulator should not be mounted in a small

airtight enclosure which would prevent air circulation around it.

(3) Four mounting holes (one in each corner of the main chassis) are provided for attaching the regulator.

(4) Position the regulator in its mounted location and attach with four each screws, washers, and nuts.

B. Connections

All electrical connections to the regulator are made through a nineteen pin, receptacle connectror (l-2,14,

Fig. 1) which is bracket mounted on the chassis. (See connection diagram Figure 1.)

2. Preparation for Use

A. No special preparation is necessary to place the regulator in service other than the following checks and in-

spections:

(I) Check all terminal lug type connections for security.

(2) Check all plug and receptacle type connectors to make certain they are firmly mated.

B. It may be necessary to adjust a new regulator at initial start-up after installation (see Chapter 2, Section 4).

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Page 1



485321

Voltage Regulator Connection Diagram

Figure 1

1-3

Page 2

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CHAPTER 1. DESCRIPTION/OPERATION T

-7 I

1. Operating Procedures

’ SECTION 4. OPERATION

A. Operating procedures, as such, arenot applicable to the static voltage regulator because it requires no start,

stop, or operating instructions. See Chapter 2, Section 4, for initial start-up adjustments and procedures.

8. Make certain the voltage droop control switch (1-2, 4, Fig. 1 I is in the ON position when the generator set is used in a paralleled installation. When a generator set is installed alone, place the control switch in OFF position.

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CHAPTER 2. MAINTENANCE

SECTION $1. DESCRlPTlON AND OPERATION

I ‘I 1. Sequence and Theory of Operation

A description of the sequence of events, which occur when the static voltage regulator is in operation, is presented ’

here to give maintenance personnel a better understanding of how and why the unit operates, and thus assist them

in the adjustment, troubleshooting and repair of the equipment.

A. When the machine is started, the rotary exciter is excited from alternator residual magnetism through the starting relay and the magnetic amplifier rectifier. As the rotary exciter voltage increases, alternator excitation

increases and the alternator voltage builds up. The voltage detection circuit of the regulator receives this volt-

age, rectifies and filters it, and feeds it into the voltage comparison circuit. When the voltage becomes high

enough, the build-up relay switches the reactor load windings into the circuit. The magnetic amplifier reactor saturates from self saturation, presenting a low impedance to the alternator voltage allowing the exciter field

power to increase as alternator voltage increases.

B. As the alternator voltage approaches its regulated value, the reference bridge voltage increases. The voltage

across the reference diode remains constant, clamping the emitter of the NPN input transistor to a fixed voltage above negative. The base voltage of the transistor increases as the bridge voltage increases. The transistor be-

comes forward biased and conducts, turning on the PNP transistor in series with the reactor control coil.

This allows current to flow in the magnetic amplifier reactor control winding in a direction opposing self

saturation and the reactor core becomes less saturated. As the reactor desaturates, the impedance to the alternator voltage by the raactor load winding increases, The rectified current flowing in the exciter field

from the magnetic amplifier is limited by the increasing reactor impedance. When the alternator voltage

reaches the regulated value, the rectified three-phase voltage of the sensing circuit is just enough to cause

the magnetic amplifier output to excite the exciter sufficiently to maintain the alternator voltage at its reg ulated level.

C. The voltage at which the alternator is regulated may be varied by changing the position of the slider on the

“Volts Adjust” potentiometer. This increases or decreases the potential of the base of the pre-amplifier input

transistor, changing that transistor’s driving signal. Increasing the potential of the slider with respect to the

detection circuit negative causes regulated voltage to decrease. Decreasing the slider potential causes the

voltage to increase.

D. Voltage Regulation

(I 1 Load applied

When the alternator is loaded, its terminal voitage decreases, lowering the rectified three-phase voltage

of the voltage detection circuit. The base potential of the pre-amplifier input transistor is directly pro-

portional to the detection circuit DC voltage, which is, in turn, directly proportional to the alternator voltage. The potential of the emitter is the constant potential of the reference voltage. When the alternator voltage drops, the voltage from base to emitter of the transistor decreases. The transistor collector current, flowing from the base of the second stage transistor, decreases, lowering the output of the second stage transistor. The lower control current in the reactor control winding allows reactor self saturation to

make the reactor core more saturated. As the reactor saturates, its impedance decreases and the rectified

current flowing in the rotary exciter field increases. The alternator voltage increases until the voltage re-

turns to its regulated value.

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(2) Load removed

i 6 When a load is removed from the alternator, the alternator voltage rises. The rectified three-phase voltage

in the sensing circuit also rises, while the emitter potential clamped by the reference voltage, remains

constant. The base to emitter voltage tends to increase, turning the transistor further on. The second

stage transistor turns on more, increasing the control current of the magnetic amplifier. This causes’s

decrease in the reactor core saturation, decreasing the regulator output power and lowering the machine

excitation until the alternator voltage returns to its regulated value.

2-1

Page 2

Ott 13/80




j &CTION 2. TROUBLESHOOTING

1. General

Troubleshooting is an orderly process of checking and eliminating possible causes of trouble until the exact cause

of a trouble is found. As a rule, the best place to start looking for the cause of a trouble in a circuit is at the source

of power. Continue testing and checking the circuit, step-by-step, in an orderly manner, until the cause of trouble is located.

2. Troubleshooting Chart

A. Description

Refer to Figure 1. The troubleshooting chart lists information under three (3) headings:

(I) Trouble

(2) Probable cause

(3) Remedy

8. Use of the Troubleshooting Chart

(I) The troubleshooting chart is furnished to provide maintenance and repair personnel with a time-saving guide in locating troubles. The chart makes it possible for the electrician to go directly to the source of

trouble without checking an entire circuit.

NOTE: See the Schematic Diagram for location of parts identified by reference designation in the

troubleshooting chart. Also see 3-1, Fig. 1 for identification by part number.

(2) If the cause of a trouble is an uncommon one and cannot be located by use of the chart, then the only

alternative is to completely check the affected circuit(s).

(3) All of the troubles listed in the chart are not necessarily caused by a defective voltage regulator. See the

applicable ground power (or other) manual for additional trouble causes and iemedies.

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TROUBLE, SYMPTOM, AND CONDITION PROBABLE CAUSE TEST, CHECK, AND/OR REMEDY

VOLTAGE REGULATOR

I. Generator voltage, will i ‘I

a. Fuse (F501) open a. Replace fuse.

not build up to normal

b. Shorted or open power diode

(CR531 thru CR534)

b. Replace defective diode.

c. Exciter field circuit shorted or grounded

c. Repair.

d. Sensing and pre-amplifier plug not d. Connect.

connected

e. Generator field circuit open

f. Generator field circuit ballast

resistor open

e. Restore continuity.

f. Replace resistor.

g. Voltage build-up circuit relay g. Replace relay.

(K501) normally closed contacts

open

h. Generator residual voltage too h. “Flash” exciter fields with 12-volt DC

low, or reversed from a storage battery.

2. Generator voltage builds a. Voltage reference diode (VR501) a. Replace diode.

up until relay actuates: shorted

then falls back b. Pre-amplifier transistor (0501 or

Q502) shorted

b. Replace transistor.

c. Pre-amplifier diode (VR502)

shorted

c. Replace diode.

d. Stability capacitor (C506) shorted d. Replace capacitor.

3. Generator voltage builds a. Voltage build-up relay (K5011 a. Replace relay.

to a dangerously high defective

level. Flashing relay

does not actuate. (I ) Coil open

(2) Contacts “welded”

b. Voltage build-up resistor (R512)

open

b. Replace resistor.

c. Sensing diode (CR501, CR502, or c. Replace diode and check sensing trans-

CR5031 shorted formers for damage.

I--..!-I--L--r!-- TrL--r ,-L--r 4 -+ A\ n-r 4.3 ,nn

Page 2

I ro”“lesn”“rlny UliNL ,arleBL I “1 ‘+,

Figure 1 UCI: IJlUlJ



TROUBLE, SYMPTOM,

AND CONDITION PROBABLE CAUSE

VOLTAGE REGULATOR (Continued)

TEST, CHECK. AND/OR RFMFDY

4. Genera& voltage builds to a dangerous

ly high level; flashing

relay actuates, but

voltage is not con-

trollable with volt-

age adjusting potentiometer.

5. Poor voltage regula-

tion when generator is loaded (droop at

regulator input terminals more than

1%)

I ‘I a. Magnetic amplifier reactor (L505)

winding open

b. Droop circuit coupling plug

(P502) not it-socket

c. Damping potentiometer (R572)

open

d. Voltage comparison potentiometer

(R571) circuit open

e. Voltage comparison resistor

(R509) open

f. Voltage comparison reference diode (V R501) open

g. Pre-amplifier capacitor (C505)

shorted

h. Preamplifier transistor (Q501, 0502) open

i. Pre-amplifier resistor (R507 or

R511) open

j. Pre-amplifier diode (CR514)

shorted

a. Voltage comparison resistor

(R506 or R508) open

b. Voltage sensing choke (L501,

L502, L503, or L504) partially

shorted

c. Voltage sensing diode (CR501 thru CR5091 open

d. Voltage comparison reference diode (VR501) has high dynamic

resistance

e. Preamplifier transistor (Q501 or Q502) low gain

a. Replace rotor.

b. Connect plug.

c. Replace potentiometer.

d. Restore continuity.

e. Replace resistor.

f. Replace diode.

g. Replace capacitor.

h. Replace transistor.

i. Replace resistor.

j. Replace diode and check transformers

(T501, T502 and T503) for damage.

a. Replace resistor.

b. Replace choke.

c. Replace diode.

d. Replace diode.

e. Replace transistor.

Ott 13180 Troubleshooting Chart (Sheet 2 of 4)

Figure 1 2-2

Page 3


~IHIItiVULIHIJt KtbULHIUK,l-HKI I\1U.LtJU3JUH



6. Generator voltage

unstable I

a. Damping tra Ai’ fofmer (T504) open a. Replace transformer.

b. Damping rheostat (R551) incor- b. Adjust or replace rheostat.

rectly adjusted or open

c. Damping resistor (R510) open c. Replace resistor.

d. Damping potentiometer (R572) d. Check continuity -- if good, adjust;

incorrectly adjusted or open if not, replace potentiometer.

7. Voltage of one phase a. Voltage detection resistor (R502) a. Replace resistor.

rises unusually high, open line to neutral, with

unbalanced load b. Voltage detection transformer b. Replace transformer.

(T501, T502, or T503) shorted

or open

c. Voltage detection choke (L502,

L503, or L504) coil open

c. Replace choke.

d. Voltage detection diode (CR51 1, CR512, or CR513) shorted

d. Replace diode.

8. Generator voltage be- a. Voltage detection diode (CR501 a. Replace diode and transformers I

comes erratic; smoke thru CR509) shorted (T501, T502, and T503).

comes from voltage

detection transformers. b. Voltage detection capacitor (C501 thru C504) shorted

9. Generator sets not a. Voltage droop circuit defective

sharing load as indi- or malfunctioning

cated by master warn-

ing light in control (I ) Droop control switch (S501)

center, or by am- in OFF position

meters.

(2) Droop adjusting rheostat

(R552) improperly adjusted or defective

b. Replace capacitor and transformers

(T501, T502, and T503).

a. Check components of voltage droop

circuit.

(1) Place switch in ON position.

(2) Adjust rheostat (R552) to full clockwise position. Replace if defective.

(3) Sensing transformer (T17) de-

fective

(3) Check transformer for “open” condi-

tion. Replace if defective.

NOTE: Transformer (T17) is located

on generator set current transformer

panel which is on the interior panel.

2-2

Page 4

Troubleshooting Chart (Sheet 3 of 4) Figure 1

Ott 13/80

OPERATION AND MAINTENANCE MANUAL TM-760 CTATIl- \,r\l TAPC DCPl II ATnn nA n-r hlfi A’)nC-nn i)lr\ltb VVLI~UC ncuu~n~un,rnn~ 1~u.43~33~~



i \I 9. Generatbr sets not a. Voltage droop circuit defective a. Check components of voltage droop

sharing load as in- or malfunctioning (continued) circuit (continued). dicated by master

warning light in (4) Droop transformers (T505 (4) Check transformers foi open or control center, or or T506) defective shorted condition. Replace if by ammeters. defective. (Continued)

NOTE: Transformers are “cross” wired. See Schematic Diagram.

uct IJIW I rouu~esnoorrng mar1 t3neex 4 0T 41

Figure 1 2-2

Page 516

1 I




SECTION 3. REMOVAL AND INSTALLATION

1. General ’

It is recommended that the voltage regulator be removed from its mounted position and placed on a workbench

before any removal of components is attempted, with the exception of the fuse, fuseholder, etc., which are easily

accessible.

2. Removal of Voltage Regulator

A. If the unit is tray mounted, disconnect main connector (I-2; 14, Fig. 1) and slide tray out of its compartment.

Exercise care at all times to avoid dropping the unit.

B. Remove attaching hardware and lift unit out of tray.

C. Place the unit on a clean workbench.

3. Removal of Regulator Main Components and Subassemblies

There are no special instructions required for removal of regulator main components. Use standard electrical

industry practices.

4. Installation of Regulator Main Components and Subassemblies

Install regulator components in accordance with good industry practices, making certain that all electrical connec-

tions are tight and all attaching hardware is securely installed.

Ott 13/80 2-3

Page l/2

OPERATION ANDWANCE MANUAL TM-760



SECTION 4. ADJUSTMENT AND TEST

1. Adjustment i ‘I

A. General

(1) When a new voltage regulator is first put in service, it may require up to four separate adjustments.

(2) The adjustments are for generator voltage control, damping, rate, and line droop compensation.

(3) Except for output voltage adjustment, the generator should be operating under light load when adjustments are made.

B. Adjust Voltage Control

(1) The output voltage at which the generator is regulated is adjustable by this rheostat control (I-2; 2, Fig. 1).

(2) Turn the rheostat knob clockwise to increase generator output voltage, and counterclockwise to decrease

voltage.

(3) Observe the output voltage as indicated by the voltmeter which is located on the control panel.

(4) It may be necessary to readjust the voltage control after other adjustments are completed.

C. Adjust Damping Gain

The gain adjustment for the damping circuit is a 1500-ohm variable resistance in series with the primary wind-

ing of the damping transformers. This resistor is in the form of a screwdriver adjustable potentiometer (8)

with a locking nut, located on the right side of the end of the sensing and pre-amplifier assembly. Turning the

potentiometer screw clockwise increases the resistance, decreasing the system damping and making the regu-

lator less stable. Turning the adjustment screw counterclockwise decreases the resistance, improving the reg-

ulator stability but slowing the regulator response. This resistance is set at the factory for satisfactory response times and should not ordinarily require additional adjustment, however if adjustment becomes necessary, pro-

ceed as follows:

(I) Loosen the potentiometer adjusting screw lock nut.

(2) Turn the adjusting screw counterclockwise, with a screwdriver, to improve generator output stability.

(3) Turn the adjusting screw clockwise to decrease regulator response time.

Best adjustment is approximately 314 of full travel clockwise.

(4) Tighten the lock nut securely after the adjustment has been completed.

Ott 13180 24

Page 1

OPERATION AND MAINT-ANUAL TM-760


D. Adjust Damping Rate

The rate adjustment is a 2500-ohm potentiometer (10) connected across the secondary of the damping trans-

former. Both the amplitude of the damping signal and its phasing are affected by this potentiometer. Because

of this, a relatively large change in system performance is obtained with a relatively small change in its setting.

When the screw is turned full counterclockwise, the amplitude of the damping signal fed into the transistor

pre-amplifier is minimum. When the screw is set full clockwise, the signal is maximum. The system may be

unstable with this potentiometer set at either maximum or minimum because of the phase shift. The potenti-

ometer is set and locked at the factory for good system transient response and should not need further adjustment. If the potentiometer does need adjustment, proceed as follows:

(7) Loosen the adjusting screw lock nut.

(2) Turn the adjusting screw to near its full counterclockwise position.

(3) Turn the adjusting screw slowly clockwise while observing the generator output voltage on a lightly damped voltmeter. The generator output voltage will oscillate until a certain point of adjustment is

reached, at which it will abruptly become steady.

The best adjustment for the system will usually be reached when the screw is turned just slightly (5O

to lOoI beyond this point in a clockwise direction.

(4) Tighten the lock nut.

E. Voltage Droop Adjustment

The amount of voltage droop is adjusted by a rheostat (5). This adjustment is also made at the factory and should require no attention unless tampered with. The best adjustment is at or near full clockwise rotation

position.

2. Test the Voltage Regulator

After necessary adjustments have been completed, test the voltage regulator as follows:

A. Connect a voltmeter at the load end of the generator output cables.

B. Operate the machine at no load and observe voltage reading.

C. Operate the machine under load and observe voltage reading.

D. Voltage under load and no load should vary no more than 1% at the load end of the cables.

NOTE: The panel mounted voltmeter will indicate a higher voltage than indicated by a voltmeter - at the load end of the output cables. The amount of variance will depend upon cable

length and size.

2-4

Page 2

An oscilloscope will give the best indication of voltage regulator performance.

Ott 13180

OPERATION AND-ANCE MANUAL TM-760



SECTION 5. INSPECTION AND CHECK

1 ‘I 1. I nspectioh

A. General

Inspect the voltage regulator, periodically, at the same time other inspections of the generating unit are made.

8. Inspect Connectors and Terminals

(I) inspect connectors for full engagement.

(2) Inspect terminals for security.

C. Inspect Wiring

Inspect wire insulation for cracks and damage.

D. Inspect Attaching Parts

Inspect attaching hardware for security.

2. Check the Voltage Regulator

A. General

Figure 1 provides a list of electrical checks which may be performed to locate defective components in the voltage regulator. Use the chart in conjunction with the schematic and connection diagrams.

8. Conditions for Check

(1) The generator must have no load (other than the regulator).

(2) When bench testing, input must be 115-V AC, 4-wire, 3-phase, 400-Hz.

(3) A Fluke No. 8040A, five-digit multimeter is recommended for checking voltage values.

NOTE: 1. Except as noted, voltage values iisted in the chart were observed when the regulator was

supplying two amperes of direct current to the generator exciter fields. This current value may be different for some installations of the regulator and, consequently, the voltage check values may vary slightly.

2. Droop circuit tests MUST be made whenTWO generators are operating in PARALLEL at NO LOAD and with DROOP switch in ON position. Values indicated by an asterisk*

must be checked under these conditions.

Ott 13/80 2-5

Page 1

REFERENCE

DESIGNATION

c501

C5d2 1

c503

c504

c505

C506

c507

CR501

CR502

CR503

CR504

CR505

CR506

CR507

CR508

CR509

CR510

CR51 1

CR512

CR513

CR514

CR515

CR531

OPERATION AND MAINTEANUAL TM-760


WHERE VOLTAGE DESCRIPTION IS OBSERVED

Capacitor, 3 pF, 5p V *

i ‘I

Across Capacitor

Capacitor, 3 ,uF, 50 V Across Capacitor

Capacitor, 3 pF, 50 V Across Capacitor

Capacitor, 3 E.IF, 50 V . Across Capacitor




Diode, IN 4820 Across Diode















Diode 52040 Across Diode

Voltage Regulator Check Chart (Sheet 1 of 4)

Figure 1

VOLTAGE

16.0 Volts DC

12.5 Volts DC

12.5 Volts DC

12.5 Volts DC

.58 Volts DC

5.4 Volts DC

Too Low To Read

16.8 Volts DC

16.8 Volts DC

16.8 Volts DC

13.0 Volts DC

13.0 Volts DC

13.0 Volts DC

13.0 Volts DC

13.0 Volts DC

13.0 Volts DC

.65 Volts DC

.60 Volts DC

.60 Volts DC

.60 Volts DC

3.8 Volts DC

2.6 Volts DC

33.0 Volts DC

2-5

Page 2

I I OPERATION AND MAINTENANCE MANUAL TM-760


REFERENCE

DESIGNATION

CR532

CR533

CR534

K501

L501

L502

L503

L504

Q501

0501

0501

Q502

Q502

Q502

R501

R502

R503

R504

R505

R506

R507

R508

R509

WHERE VOLTAGE DESCRIPTION IS OBSERVED

Diode q2bpO Across Diode

Diode S2040 Across Diode

Diode S2040 Across Diode

Relay, KHP17D41 Across Relay Coil

Choke, 1 CZ-63 Across Choke Coil




Transistor 2N3904 Emitter To Base

Transistor 2N3904 Base To Collector

Transistor 2N3904 Emitter To Collector

Transistor MM4007 Emitter To Base

Transistor MM4007 Base To Collector

Transistor MM4007 Emitter To Collector

Resistor, 150 ohms, 5 watt Across Resistor







Resistor, 470 ohms, I/2 watt Across Resistor



VOLTAGE

33.0 Volts DC

33.0 Volts DC

33.0 Volts DC

13.0 Volts DC

.60 Volts DC

.60 Volts’DC

.60 Volts DC

.60 Volts DC

.55 Volts DC

9.2 Volts DC

9.8 Volts DC

.55 Volts DC

12.0 Voits DC

12.6 Volts DC

1.8 Volts DC

12.5 Volts DC

12.5 Volts DC

12.5 Volts DC

12.5 Volts DC

5.9 Volts DC

.I5 Volts DC

6.0 Volts DC

3.0 Volts DC

Ott 13/80

Figure 1

2-5

Page 3

OPERATION AND MAINTGANUAL TM-760


REFERENCE WHERE VOLTAGE

DESIGNATION DESCR-IPTION ( IS OBSERVED VOLTAGE

R510. Resistor, 1000 ohm 6; , 25 watt Across Resistor 65 Volts AC I 44 Volts DC

R511 Resistor, 100 ohms, 5 watt Across Resistor 3.4 Volts DC

R512 Resistor, 47 ohms, 1 watt Across Resistor 7;2 Volts AC

3.3 Volts DC

R513

R551

R552

R571

R571

R571

R572

Resistor, 1000 ohms, l/2 watt Across Resistor

Rheostat, 1500 ohms, 25 Across Rheostat

watt

Rheostat, 5 ohms, 75 watt

Voltage Adjust Potentiometer R509 End To Slider

Voltage Adjust Potentiometer R506 End To Slider

Voltage Adjust Potentiometer Across Potentiometer

Potentiometer, 2500 ohms, Slider To R571 End

2 watt

7.2 Volts DC

20 Volts AC ’ 15 Volts DC

2.4 Volts DC

.7 Volts DC

3.1 Volts DC

Too Low To Read

R572

L505

Potentiometer, 2500 ohms, Across Potentiometer 5.9 Volts AC ,

2 watt

Saturable Reactor Across Winding l-2 140 Volts AC .4 Volts DC

L505

L505

L505

T17

T501

T501

Saturable Reactor Across Winding 3-4 140 Volts AC

.4 Volts DC

Saturable Reactor ‘, Across Winding 5-6 6.0 Volts AC

.38 Volts DC

Saturable Reactor Across Winding 7-8 11 ;OmoltsAC-~ ~~ -- -~~ ~~~

Transformer Current Droop Across Winding * 1.1 Volts AC

Transformer, Sensing Green To Black 120 Volts AC

Transformer, Sensing Red To Orange 30 Volts AC

* Check voltage with two units paralleled, no load, droop circuit switch ON.


Figure 1

2-5

Page 4 Ott 13180



REFERENCE

PRESCRIPTION

WHERE VOLTAGE

DESIGNATION IS OBSERVED I

T501 Transformer, Sensing Red To Blue

T502 Transformer, Sensing Green To Black

T502 Transformer, Sensing Red To Orange


T503 Transformer, Sensing Green To Black

T503 Transformer, Sensing Red To Orange


T504 Damping Transformer Orange To Blue

T504 Damping Transformer Red To Brown

T505 Transformer, Droop Black To Blue

T505 Transformer, Droop Blue To White

T506 Transformer, Droop Black To Blue

T506 Transformer, Droop Blue To White

VR501 Reference Diode Across Diode

VR502 Diode Across Diode

* Check values with two units paralleled, no load, droop circuit switch ON.

VO LTAG E

15 Volts AC

120 Volts AC

30 Volts AC

15 Volts AC

120 Volts AC

30 Volts AC

15 Volts AC

6.0 Volts DC

11 .O Volts AC 1.1 Volts DC

* 163.8 Volts AC

* 2.3 Volts AC

* 53.7 Volts AC

*3.7 Volts AC

6.1 Volts DC

8.9’Volts DC


Figure 1

C. Checking Droop Circuit Components

To check droop circuit values:

(1) Remove voltage regulator from generator set.

Ott 13/80 2-5

Page 5



(2) Remove attaching screws and turn drooi, chassis upside down to reach internal components. I ‘I

(3) A “pat&-in” cable assembly must be made up to connect Amphenol plug and receptacle connectors

which were disconnected when voltage regulator was removed.

(4) Operate the generator set in parallel with another (identical) set at NO LOAD. Be sure droop circuit

switch is in ON position.

Patch Cable 7

Multimeter

Voltage Regulator Partially Disassembled for Droop Circuit Check Figure 2

2-5

Page 6

Ott 13/80

I I




pI;CTION 6. CLEANING AND PAINTING 1

1. Cleaning

Under normal operating conditions, very little cleaning is required; however, when operating unde,r dusty condi-

tions, it may be necessary to periodically clean the regulator with compressed air.

CAUTION: A. MAKE CERTAIN THE COMPRESSED AIR IS CLEAN AND DRY.

B. EXERCISE CARE TO AVOID DAMAGE TO COMPONENTS.

2. Painting

A.

B.

C.

General

Only the sheet metal components of the voltage regulator are painted. Electrical and electronic components should never be painted.

Preparation for Painting

(I) Remove the regulator from the control box (or its mounted position) and place on a clean workbench.

(2) Disassembie as required to remove the component(s) to be plated.

(3) Prepare the surface to be painted by sanding. Remove all rust.

(4) Use tape to mask any electrical components not removed in step (2) above.

(5) Prime all bare metal surfaces with red oxide primer, Hobart No. 903318, or equivalent.

Painting the Unit

(1) Make certain that all surfaces are clean and dry.

(2) Paint all prepared surfaces with gray enamel paint, Hobart No. 903316, or equivalent.

Ott 13/80 2-6

Page If2

I I




SECTION 7. REPAIR I

1. Repair of the Unit

Repair of the voltage regulator will consist of parts replacement only.

A. Use the troubleshooting chart, 2-2, Fig. 1, and the electrical check chart, 2-5, Fig. 1, to locate defective

parts.

B. If the defective part cannot be replaced while the regulator is in its mounted position, remove the unit and

place it in a clean workbench.

C. Disassemble as required to reach the part to be replaced.

D. Remove the part(s) found to be defective in step A. above, and install new part(s).

E. Reassemble and reinstall the unit.

F. Adjust, if required, in accordance with 2-4, paragraph 1.

Ott 13180 2-7

Page If2



CHAPTER 3. ILLUSTRATED PARTS LIST

1. Introduction

Ai Scope i 4

The Illustrated Parts List identifies, describes, and illustrates all components of the Static Voltage Regulator, , part no. 430538A, with the exception of attaching hardware.

6. Purpose

The purpose of the Illustrated Parts List is to provide maintenance and provisioning personnel with identifica-

tion and descriptive data for use in the provisioning, requisitioning, storing and issuing of spare parts.

2. Explanation of Parts List Form

This form is divided into five columns. Beginning at the left side of the form and proceeding to the right, columns

are identified as follows:

A. “FIGURE ITEM NO.” Column

This column lists the figure number of the illustration applicable to the list and also identifies each part in

the illustration by an item number which appears on the illustration. Assemblies and subassemblies which are

illustrated in their disassembled state will not be identified by an item number.

B. “HOBART PART NUMBER” Column

ALL part numbers appearing in this column are Hobart numbers. In all instances where the part is a purchased

item, the vendor’s identifying five-digit code and his part number will appear in the “NOMENCLATURE” column. Vendor parts which are modified by Hobart will be identified as such in the “NOMENCLATURE”

column. In case Hobart does not have an identifying part number for a purchased part, the “HOBART PART

NUMBER” column will reflect “NO NUMBER” and the vendor’s number will be shown in the “NOMEN-

CLATURE” column. Parts manufactured by Hobart reflect no vendor code or his part number in the “NO-

MENCLATURE”column.

C. “NOMENCLATURE” Column

The item identifying name appears in this column. The indenture method is used to indicate item relationship. Thus, components of an assembly are listed directly below the assembly and indented one space. Vendor codes

and part numbers for purchased parts are shown in this column. Hobart modification to vendor items is also

noted in this column.

D. “EFF” (Effective) Column

Code letters “A”, “B”, “C”, etc., are used in this column to indicate the use of parts when more than one

model or type of machine is covered by the parts list. Parts in this manual require no coding.

E. “UNITS PER ASSY” Column

This column indicates the quantity of parts required for an assembly or subassembly in which the part appears.

This column does not necessarily reflect the total used in the complete end item.

Ott 13/80 3-l

Page 1

L I OPERATION AND MAINTENANCE MANUAL TM-760


3. Manufacturer’s Codes

The following list is a compilation of vendor cohes with names and addresses for suppliers of purchased parts i ’

listed in this publication. The codes are in accordance with the federal Supply Codes for Manufacturer’s Catalog-

ing Handbook H4-1, and are arranged in numerical order.

CODE VENDOR’S NAME AND ADDRESS

01746 Electronics Engineers Inc.

5615 Division Chicago, Illinois 60651

02660

15605

44655

50508

Amphenol Corporation

2801 S. 25th Avenue Broadview, Illinois 60153

Cutler-Hammer 1391 W. St. Paul Avenue Milwaukee, Wisconsin 53233

Ohmite Manufacturing Company

3601 W. Howard Street

Skokie, Illinois 60076

Magnetic Components Inc. 9520 Ainslite Street Schiller Park. Illinois 60176

71400 Bussmann Manufacturing Division of

McGraw-Edison Company

2536 W. University Street

St. Louis, Missouri 63017

77342 Potter & Brumfield Div. AM F Company 1200 E. Broadway Princeton, Indiana 47570

96682 Genisco Technology Corporation

18435 Susana Road

Compton, California 90221

3-l

Page 2

Ott 13180



This page intentionally left blank.

Ott 13180 3-l

Page 3

1 OPERATION AND MAINTENANCE MANUAL TM-760


3-l

Page 4

Voltage Regulator Assembly

Figure 1

Ott 13/80

FIGURE HOBART

ITEM NO. PART NO.

I- 480538A

1 485530

430539 2 401563-l

3 1 CZ-64

4 50GH-823 5 77c-1037

6 16DA-2162

7 FW-1312

8 430540 9 430476 10 W-9746-9

11 1 cz-74 - 12 402342

13 16DA-2162

14 H F-745

15 30G H-734

16 77B-1039-1

17 370141

18 25MS-328

19 402376

20 400782-l

21 H F-2407

180230 22 43034 1 23 180229 24 79B-1140

25 79A-1142

26 404460-l

27 485282 28 485283

29 401563.2

30 401563.3 31 400698.2

32 W-971 2-30

33 1 CZ-60

OPERATION ANDGANCE MANUAL TM-760


NOMENCLATURE UNITS

REC. per 1234567 SPARES EFF ASSY

EGULATOR, VOLTAGE, ASSEMBLY

. CHASSIS, REGULATOR

. CHASSIS, DROOP CIRCUIT, ASSEMBLY

. . HOUSING, PIN CONNECTOR

. . TRANSFORMER, DROOP CIRCUIT V01746, No. E3712

. . NAMEPLATE, IDENTIFICATION

. . RHEOSTAT, DROOP CIRCUIT, 5 OHM, 75 WATT V44655, No. 1104

. . KNOB, INDICATOR, RHEOSTAT V44655, No. 5150

. . SWITCH, ON-OFF V15605, No. 732OK3

PANEL, CHASSIS, DROOP CIRCUIT 1 INSULATOR, BOTTOM, RESISTOR . RESISTOR V44655, No. 0205 . INSULATOR, TOP, RESISTOR . REACTOR, REGULATOR V96682,

No. 70-8532

. KNOB, RHEOSTAT V44655, No. 5150

. NAMEPLATE

. BRACKET, MOUNTING, RHEOSTAT

. POTENTIOMETER, 10 TURN, 2 WATT

VI 2697, No. 73JA

. BRACKET, MOUNTING PLUG

. SPACER

. RECEPTACLE VO2660, No. MS-1302A-22.14P

. FUSE, 5 AMP FAST ACTING, GLASS TUBE,

MTH 1

. FUSEHOLDER V71400, No. HKP

. CHASSIS SENSING & PRE AMP, ASSEMBLY

. . BRACKET, MOUNTING, CHASSIS

. . BOARD, PC, HIGH PHASE SENSING 1

. . . RELAY V77342, No. KHU17Dll 1

. . . SPRING, RELAY RETAINING V77342

. . SUPPORT, PC BOARD, LOCKING

. . BRACKET, MTG., PC BOARD, FRONT

. . BRACKET, MTG., PC BOARD, REAR



. . POTENTIOMETER, 2500 OHM, 2 WATT V44655, No. CLU-2521

. . RHEOSTAT, 1500 OHM, 25 WATT V44655,

No. H . . TRANSFORMER, DAMPING V50508,

No. E3196-A

1

1

1 1

1

2

1

1

1

1

1 1 1 1 1

3 1

1

1 1

1

1

1

OCt 15/86 3-l

Page 5

FIGURE HOBART ITEM NO. PART NO.

l- 34 402357

!

35 430473 36 lCZ.63

37 402358 l

401564-I +

401564.2 *

401564.3

* HOT ILLUSTRATED

OPERATION AND MAINTENANCE MANUAL M-760 STATIC VOLTAGE REGULATOR, PART 90. 4305388

NOMENCLATURE

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. . TRA/N$FORMER, HIGH PHASE V50508, No. 40-8587 PANEL. CHASSIS

: : REACTOR, FtbTER, HIGH PHASE V50508, Ns. E3661-A NAMEPLATE. A0JUST

1 H~U.S~NG CONNECTOR . HOUSING CONNECTOR . HOUSING CONNECTOR

UNITS REC. per

SPARES EFF ASSY

3

4 1

2

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Page 6

Ott 13/80

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I

tm-760 101380 revised 121080 revised 101586 operation …revised 101586 operation and maintenance...

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