Hobart 60CU24, Operation And Maintenance Manual With Illustrated Parts List, Page: 112 / 234

OM-2098C / Operation and Maintenance Manual
60CU24 / Series 500060C / 400 Hz. Generator Set
April 01, 2005 Chapter 2-4
Page 18
Trouble, Symptom, Condition Probable Cause Test, Check, and/or Remedy
No. 2 Load Contactor Operating Circuit (if applicable) [continued]
1. Load contactor (K201) will not
close when output No. 1 push
button switch is held in close
position. Generator running at
normal voltage. Rectifier circuit
breaker (CB2) closed. No fault
indicated. (continued)
f. Defective coil in load contactor
(K201).
Disconnect leads at load contactor
terminals V and W. Check coil
resistance between these
terminals. Resistance should be
approximately 50 ohms. If coil is
defective, replace complete load
contactor.
a. No. 2 plug interlock EF2 circuit
on CTL board could be defective
Place EF Bypass switch, No. 1
output in ON position. If load
contactor remains closed, proceed
to step
b.
b. 28.5-V DC is not reaching the
No. 1 plug interlock EF2 circuit
from aircraft for following reasons
d & e :
Proceed as follows to find the
cause of this malfunction.
d. 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.
e. Aircraft rejecting power. Check aircraft on-board electrical
equipment and controls.
2. Load contactor (K201) will
close when output No. 1 push
button switch is held in CLOSE
position. Opens immediately when
switch is released.
f. Defective contacts in N.O.
auxiliary push button switch
mounted on right side of contactor
(K1).
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.
a. A fault has developed in load
contactor holding circuit.
If load contactor cannot be closed
by operation of output No. 1 push
button switch (S275), check circuit
in accordance with instructions in
Trouble, Symptom, Condition 1. If
load contactor can be closed, but
opens as soon as power accepted
switch (S275) is released, check
for trouble under Trouble 2, above. 3. Load contactor opens during
power delivery. No fault indicated.
c. Cable accidentally
disconnected from aircraft.
Reconnect cable.