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OM-2031
TROUBLE, SYMPTOM
AND CONDITION
GENERATOR EXCITATION CIRCUITS (CONTINUED)
1. No (or low) genera-
tor output voltage
in all phases. Gen-
erator operating at
400 Hz in AUTOMATIC
mode. (Continued)
3-1
Page 18
PROBABLE CAUSE
C. Defect in VOLTAGE
REG. excitation cir-
cuit.
(1) Defective AUTO-
MANUAL switch
(33, Fig. 1)
(2) Defective exci-
tation-deenergi-
zation relay
(K16) (1-1; 3,
Fig. 7)
(3) Defective ballast
resistor(s), (See
Fig. 2)
Trouble Shooting Chart (Sheet 10 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
C. Check as follows:
(1) Check the switch thor-
oughly. A defective
switch may prevent cur-
rent reaching and/or
leaving the voltage reg-
ulator. Replace switch
if defective.
(2) Check EDR contacts. A
faulty EDR can prevent
power from reaching the
voltage regulator. Re-
place relay if defective
(3) If output voltage was
produced when the gener-
ator set was operated in
MANUAL mode, the resis-
tors are good. If no
voltage was produced in
MANUAL mode, resistors
could be defective.
Refer to Fig. 5 and con-
nect a jumper lead a-
cross the ballast resis-
tors. If an output volt-
age is now produced,
replace resistors as
August 5/89 Revised
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