TM 5-6115-400-35
transformer CVT.
16. Ineffective Cross Current Compensation
Probable cause
Probable remedy
Control (Generator Terminal Voltage
Silicon controlled rectifier ....Replace rectifier SCR
Should Drop with Application of Zero
SCR does not fire or is ..... (para 73).
Power Factor Load).
open.
Probable cause
Probable remedy
Open in unijunction semi-....Replace transistor Q2
Current transformer .............Check connections.
conductor Q2 circuit. ........ (para 73).
CVT-CC improperly.......... Correct as necessary.
Transistor Q1, Zener Z1, .....Replace as necessary
polarized. ......................... Refer to paragraph 72
or diodes in rectifier D2 .... (para. 72).
........................................ and figure 1.
open.
17. Generator Terminal Voltage Unstable
Secondary winding of ..........Replace transformer (para
Probable cause
Probable remedy
transformer T2 open. ....... 72).
Primary winding in trans- ....Replace transformer
Primary or secondary ..........Replace transformer (para
former T2 open. .............. (para 78).
winding of transformer ..... 72).
Capacitor C3 shorted .........Replace capacitor (para
T1 open.
........................................ 73).
Capacitor C1 or C2 .............Replace as necessary (para
Adjustable slide on ..............Check and correct as
shorted............................. 72).
resistor R11 not................ necessary (para 73).
20. Generator Terminal Voltage "Kills"
making contact.
When Load is Applied
18. No-Load Generator Terminal Voltage
Probable cause
Probable remedy
Too Low
Windings of current .............Check connections. Correct
Probable cause
Probable remedy
voltage transformer .......... as necessary (para 72).
One phase of reactor XL .....Replace reactor (para 72).
CVT improperly
open.
polarized.
One or more windings of .....Replace transformer (para
21. Poor Voltage Regulator During
current voltage trans- ....... 72).
Parallel Operation
former CVT open.
Probable cause
Probable remedy
Diode in rectifier REC3 .......Replace diode (para 72).
Unit parallel switch ..............Reset switch. Refer to TM
open.
(control panel) not ............ 5-6116400-12.
Zener Z1 breaks down at ....Replace Z1 (para 73).
closed.
a voltage substantially
22. Circuit Breaker Trips Off or Fails to Close
lower than 18 volts.
Transistor Q1 will not ..........Replace transistor (para
Probable cause
Probable remedy
absorb normal maximum . 73).
Circuit breaker defective ....Replace circuit breaker
voltages impressed
........................................ (para 87).
between c and e.
Overvoltage relay................Replace overvoltage relay
Improperly polarized............Refer to paragraph 72 and
flashing voltage................ paragraph 94. Check
23. Sluggish Operation of Electric
........................................ polarity of d.c. source
Governor Actuator
........................................ and reverse connections,
........................................ if necessary, to
Probable cause
Probable remedy
........................................ governor.
Dirty oil ..............................Change oil (para 92).
........................................ Replace the governor if
Defective hydraulic oil .........Change filter (para 92).
........................................ necessary.
filter.
19. No-Load Generator Terminal Voltage
Low oil pressure .................Adjust pressure on
........................................hydraulic pump (para
Too High
........................................ 92).
Probable cause
Probable remedy
Binding or sticking ...............Correct binding or sticking
Open control winding S(C) .Replace transformer (para
throttle shaft. .................... (para 92).
in current voltage
.... 72).
Section III. RADIO INTERFERENCE SUPPRESSION
24. General
25. Interference Suppression Components
Refer to TM 11-483 for definitions, purposes, source
A 1.8 to 2.4 microfarad capacitor is mounted in the
and methods used to obtain proper radio suppression.
base of the battery charging generator regulator. The
capacitor is connected in the circuit between the
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