Operation Manual – ITW GSE 6400 Tier 3
Load Contactor Operating Circuits
Output 1: Contactor K1
Trouble, Symptom, Condition
Probable Cause
Test, Check, and/or Remedy
1.
Load contactor will not close
when the corresponding
Output
pushbutton is pressed.
Generator is running at normal
voltage.
a.
Blown contactor fuse (F3) on
regulator board.
Check the fuse and replace if blown.
If it blows again, check the contactor.
b.
Defective display module
Check to make sure that the other
pushbuttons on the control panel
work. Replace the display board and
test all buttons again.
2.
Load contactor closes when
the
Output
pushbutton is
pressed, but opens within 10
seconds.
a.
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.
b.
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.
c.
Aircraft rejecting power.
Check aircraft on-board electrical
equipment and controls.
d.
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.
OM2254 Rev A
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