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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
Load Contactor Operating Circuit
Trouble, Symptom & Condition
3. Load contactor opens during
power delivery. NO fault
indicating lights on.
Protective Circuit
NOTE: The protective relays and protective monitor are not completely functional until the load contactor is
closed. Since it is not advisable to vary voltages for test purposes while delivering power to an aircraft,
the generator should be connected to a load bank for troubleshooting the protective circuits.
To avoid repetition, it will be assumed that the reset switch [(36), Fig. 1] has been pushed and the
load contactor has been closed before commencing each test.
Trouble, Symptom & Condition
1. Load contactor opens during
power delivery. Overvoltage
indicating light ON.
March 28/94 Revised
Probable Cause
a. Fuse (F1 or F2) blown.
b. A fault has developed in
the load contactor holding
circuit.
c. Cable accidentally
disconnected from aircraft.
Probable Cause
a. The over voltage condition
may have been the result
of a sudden drop in the
load, or possible tampering
with voltage regulator
adjustment potentiometer
(35, Fig. 1 ), and may have
been a normal action.
Corrective Action
Remove and inspect fuses (1-1;
16 and 17, Fig. 9.) Replace as
required.
If the load contactor cannot be
closed by operation of the control
switch (S5) (20, Fig. 1), check the
circuit in accordance with
instructions in Trouble 1, above
under LOAD CONTACTOR
OPERATING CIRCUIT. If the
load contactor can be closed but
opens as soon as control switch
(S5) is released, check for trouble
under Trouble 2, above.
Reconnect cable.
Corrective Action
Press reset switch (34, Fig. 1) and
resume power delivery. Observe
voltmeter (3, Fig. 1) to be certain
that voltage is normal 115-V AC.
Adjust to normal if necessary. If
the load contactor is opened again
and an overvoltage condition is
indicated by light (DS37), proceed
to step B.
Chapter 3-1
Page 23
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