TM 5-6115-434-12
Table 3-5. Sequence of events during performance check-Continued
Step
Condition
Power unit Indication
Adaptor indication
Remarks
12
Engine speed
If not, control air inlet
reaches about 10
2
orifice clogged.
percent governed
Oil pressure 80 to 100
If not, low oil quan-
speed (408 cps -
psig.
tity, pressure relief
governor controls
valve set low, oil
speed of engine)
pump failure, or oil
-Continued
filter dirty.
13
Place 400 Hs
Auxiliary stand-by start
No indication
If not, auxiliary standby
main contactor
relay (K5) energized
start relay (K5) failed
switch (S2)
(to prevent standby
or 400 Hz main
in CLOSE
start signal).
contactor switch (S2)
position.
contacts failed.
400 Hz Main contactor
No indication.
If not, power unit
relay (K10) ener-
control panel trip
gizes, to supply volt-
indicator lamp ex-
age to environmental
tinguished, diode
control system com-
(CR6) failed, under-
ponents.
frequencing arming
relay (K6) contacts
failed, 400 Hz gener-
rator control relay (K7)
contacts failed, 400
Hz generator control
relay (K7) actuated
by generator fault,
or 400 Hz main con-
tactor relay (K10)
failed.
400 Hz auxiliary main
No indication.
If not, power unit
contactor relay (K9)
control panel 400 Hz
energizes
main activator switch
(S2) failed, 400 Hz
main contactor relay
(K10) contacts
failed, 400 Hz auxili-
ary main contactor re-
lay (K9) relay failed.
Environmental control
If not, 400 Hz auxiliary
system can be op-
main contactor relay
erated.
(K9) contacts failed
or circuit breaker
(CB6) failed.
Hot water power sup-
ply armed. 400 Hz
output contactor
switch (S9) armed.
14
Place 400 Hz
K12 400 output con-
If not, 400 Hz output
output con-
tactor lamp illumi-
contactor switch (S9)
tactor switch
nates.
defective. Overload
in RESET
sensing control
position and
switch S1OA S1OB or
hold.
S1OC open.
400 Hz output con-
If not, standby start
tactor relay (K12)
relay (K2) failed.
energizes (indicated
by no voltage from
pin 1 positive to pin
2 negative standby
receptacle 31).
3-27
