P-9-TM-457-35 T.O. 35C2-3-442-2
TM-07464A-35 TM 5-6115-457-34
Table 2-3. Troubleshooting (Continued)
CORRECTIVE ACTION
PROBABLE CAUSE
MALFUNCTION
GENERATOR SET (Continued)
a. Test relay
29. Over voltage fault con- s. Defective over voltage
relay K2.
dition exists but load
contactor or motor
operated circuit brea-
ker does not open.
a. Defective under voltage
a. Test and remove relay
30. Under voltage fault
relay K11.
condition exists but
(paragraph 6-111 and
6-112).
load contactor or mo-
tor operated circuit
breaker does not open
(precise generator
sets).
a. Defective under fre-
a. Test relay (paragraph
31. Under frequency fault
quency relay (K12).
exists but load con-
6-189 and 6-190).
tactor or motor oper-
ated circuit breaker
does not open (precise
generator sets).
a. Test unit
32. Load contactor or mo- a. Defective load meas-
tor operated circuit
urement unit.
breaker opens and re-
b. Test and replace relay
verse power indicator b. Defective reverse
power relay.
illuminate with no re-
verse power fault.
a. Precise governor sys-
33. Generator sets do not
a. Align system
parallel properly
tem not properly
aligned.
(precise generator
sets).
b. Defective governor con-
b. Test and repair if defec-
trol unit.
tive (paragraph 6-202).
c. Defective load meas-
c. Test unit
urement unit.
d. Defective permissive
d. Remove and test relay
paralleling relay.
(paragraph 6-193 and
6-194).
Change 3
2-42
