No. 1 Load Contactor Operating Circuit
Trouble, Symptom
Test, Check, And/or
and Condition
Probable Cause
Remedy
Load contactor (K1) will close
when No. 1 power accepted
push button switch (24, Fig. 2)
is held in CLOSE position.
Opens immediately when
switch is released to center ON
position (continued).
f.
Defective contacts in N.O.
auxiliary push button switch
mounted on right side of
contactor.
Connect a jumper lead between
terminals of N.O. auxiliary
switch. If load contactor will now
remain closed, replace N.O.
auxiliary switch or complete load
contactor.
g.
Defective No. 1 output hold
circuit resistor (R46) (1-1;
8, Fig. 9) .
Connect a 100-ohm resistor
across R46. If contactor will
now remain closed, replace No.
1 output hold circuit resistor
(R46). If not, replace contactor.
3.
Load contactor opens during
power delivery. NO fault
indicating lights on.
a.
No. 1 load contactor relay
(K72) (12, Fig. 3) on
generator control PC board,
or the PC board itself,
could be defective
Replace relay K72 and again
close contactor. If contactor still
opens, try replacing the PC
board to correct this malfunc-
tion. Proceed with trouble-
shooting as follows if
malfunction is not corrected.
b.
A fault has developed in
load contactor holding
circuit.
If load contactor cannot be
closed by operation of output
No. 1 push button switch (S75)
(24, Fig. 2), check circuit in
accordance with instructions in
Trouble 1, above under LOAD
CONTACTOR OPERATING
CIRCUIT. If load contactor can
be closed, but opens as soon
as power accepted switch (S75)
is released, check for trouble
under Trouble 2, above.
c.
Cable accidentally
disconnected from aircraft.
Reconnect cable.
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
November 27/1997
Chapter 2-4
Page 17
Содержание 90CU24
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