TM 5-6115-434-12
(9)
The 400 HZ OUTPUT CONTACTOR (K12) may be checked by an alternate method. Place 400 Hz system
main contactor switch and output contactor switch on power unit instrument panel in CLOSE position. Observe that the
K12 400 Hz OUTPUT CONTACTOR lamp on the analyzer panel illuminates.
(10)
Actuate STOP switch on analyzer panel or place MASTER switch on power unit instrument panel in STOP
position and observe that the engine shuts down.
Note
Sequence of events during performance check, table 3-5, may be utilized during the functional
check procedure to determine the sequence of events, and as an aid in isolating failures.
Table 3-5. Sequence of events during performance check
Note
Turn on the following switches on analyzer. DC power, K-4 time delay, K-3 turbine hold,
starter, ignition, fuel, K-6 under-frequency and load valve. Perform the following steps and
observe analyzer and power unit indications.
Step
Condition
Power unit Indication
Adaptor indication
Remarks
1
Battery con-
Panel lamps illuminate.
If not, circuit breaker
nected.
(CB1) failed, or
battery dead.
2
Air intake doors
DC power lamp illumi-
If not, air intake door
open.
nates.
switch (S4) failed.
3
Power unit in-
Instrument panel indi-
strument panel
cator lamps will push
master switch
to test. If not, master
(S1) in RUN
switch (S1) failed.
position.
4
Power unit
K3 turbine hold lamp
If not, 400 Hz main
instrument
illuminated.
contractor switch
panel master
not in open position
switch (S1)
or failed, or 60 Hz
in START
load contactor failed,
position.
master switch (S1)
failed, under fre-
quency arming re-
lay (K6) normally
closed contacts open,
or centrifugal multi-
speed switch assembly
110 percent switch
open.
K4 time delay lamp
If not, open centrifugal
illuminated.
multi-speed switch
assembly 35 percent
switch open.
Starter lamp illuminated.
If not, time delay (K4)
contacts open.
Start relay (K1) ac-
If not, press analyzer
tuates. (Listen for
panel start switch-if
audible clicking
start relay (K1)
sound of relay.)
actuates, master
switch (S1) failed.
If start relay (K1)
still does not actuate,
start relay (K1)
failed.
3-23
