OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2
Chapter 2-4
Page 15
Load Contactor Operating Circuit (Continued)
Trouble, Symptom, Condition
Probable Cause
Test, Check, and/or Remedy
2.
Load contactor closes when
the
Output
pushbutton
switch is held in CLOSED
position but opens
immediately when the switch
is released.
a.
The plug interlock EF circuit on
CTL board could be defective
Place EF Bypass switch in the
ON
position. If load contactor remains
closed, proceed to step
b.
b.
28.5 VDC is not reaching the plug
interlock EF circuit from aircraft
for following reasons:
Proceed as follows to find the
cause of this malfunction.
c.
Generator-to-aircraft cable
connector defective or not
plugged into aircraft receptacle
connector
Inspect cable connector plug
thoroughly for damaged E and F
terminals. Be sure plug is fully
mated with aircraft receptacle
connector and making good
contact.
d.
Aircraft rejecting power
Check aircraft on-board electrical
equipment and controls.
e.
Defective contacts in switch
mounted on side of contactor
Connect a jumper lead between
terminals of the normally-open
auxiliary switch. If the contactor
now remains closed, replace the
auxiliary switch or the entire
contactor.
3.
Load contactor opens during
power delivery. No fault
indicated.
a.
A fault has developed in load
contactor holding circuit.
If load contactor cannot be closed
by operation of output pushbutton
switch, check circuit in accordance
with instructions in Trouble,
Symptom, Condition 1. If the load
contactor can be closed, but opens
as soon as power accepted switch
is released, check for trouble
under Trouble 2, above.
b.
Cable accidentally disconnected
from aircraft
Reconnect cable.
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