TM 5-6115-434-12
Table 3-3. Troubleshooting
Malfunction
Probable cause
Corrective action
15
No 60 Hz ac generator output
c. Underfrequency arming relay
c. Refer to para 3-61c(8) to
(60 Hz trip indicator lamp
(K6) failed.
check for K6 relay failure.
(DS5) illuminated.
Replace failed relay as-
-Continued.
sembly (para 3-61c).
d. 60 Hz generator control re-
d. Replace failed relay assem-
lay (K8) failed.
bly (para 3-61c).
e. 60 Hz output contactor re-
e. Replace failed relay (K11)
lay (K11) failed.
(para 3-62b).
f. Voltage regulator (VR2)
f. Refer to para 3-61, to check
failed.
for failed voltage regula-
tor. Replace failed regula-
tor (para 3-61a).
g. 60 Hz protective panel failed
g. Refer to para 3-6d(3) to
check for protective panel
failure. Replace failed pro-
tective panel (para 3-61d).
h. 60 Hz ac generator failed
h. Refer to para 3-65, a to
check for generator fail-
ure. Replace failed 60 Hz
ac generator (para 3-65).
i. Other causes
i. Refer other causes to direct
and general support main-
tenance personnel.
16
No 400 Hz ac generator
a. Overload on output
a. Adjust load. Reset contactor
output.
switch (switch is thermal,
wait 10 minutes to reset).
Check each phase with
volt-amp switch.
b. 400 Hz output contactor
b. Replace failed contactor (K12)
(K12) failed.
(para 3-61f).
c. 400 Hz output contactor
c. Replace failed contactor
switch (S9) failed.
switch (S9) (para 3-56d).
d. 400 Hz main contactor (K10)
d. Replace failed contactor
failed.
(K10) (para 3-61e).
e. 400 Hz main contactor switch
e. Replace failed 400 Hz main
(S2) failed.
contactor switch (S2)
(para 3-55d).
f. Underfrequency arming re-
f. Replace failed relay assem-
lay (K6).
bly (para 3-61c).
g. 400 Hz generator control
g. Replace failed relay assem-
relay.
bly (para 3-61c).
h. 400 Hz auxiliary main con-
h. Replace failed relay assem-
tactor relay (K9) failed.
bly (para 3-61c).
i. Voltage regulator (VR1)
i. Refer to para 3-61b(3) to
failed.
check for voltage regula-
tor failure. Replace failed
voltage regulator (VR1)
(para 3-61b).
j. 400 Hz protective panel
j. Refer to para 3-61d(3) to
switch.
check for protective panel
failure. Replace failed pro-
tective panel (para 3-61d).
k. Other causes
k. Refer other causes to direct
and general support main-
tenance personnel.
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