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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
Generator
Trouble, Symptom & Condition
1. No (or low) voltage output.
2. Generator operates single
phase.
3. Generator overheats.
4. Unbalanced output.
Chapter 3-1
Page 26
Probable Cause
a. Shorted diode in exciter
rectifier (CR2).
b. Open or shorted exciter
rotor winding (G2).
c. Open or shorted exciter
field windings (L2).
d. Open or shorted generator
rotor windings (L1).
a. An open or short circuited
winding in generator stator
(G1).
a. Loose connection causing
high resistance.
b. Improper or blocked
ventilation.
c. Check Stator windings
short circuited.
a. Loose connection in output
circuit.
b. Open or short circuited
stator Phase.
c. Defective connection in
output circuit.
d. Unbalanced load.
Corrective Action
Check diodes in accordance with
sect. 2-3, Para. 6 If diodes are
good, proceed to step B.
Use ohmmeter to check for open
or shorted condition. If rotor
windings are good, proceed to
step C.
Check for field resistance. See
Sect. 2-3. Fig. 14 for normal
values.
Check resistance with ohmmeter
to determine if open or short
circuited.
Check stator winding resistances.
See Sect. 2-3, Fig. 12 for normal
values.
Check all output connections for
looseness. Look for discoloration
caused by heat. Tighten or
replace as required.
Check for foreign materials (rags,
etc.) blocking air flow. Provide
adequate ventilation.
Check Stator windings. See Sect.
2-3, Fig 12.
Check all output connections,
Discolored connectors indicate a
loose connection. Tighten or
replace as required.
Check stator windings in
accordance with Sect. 2-3, Para.
4. Repair or replace as required.
Check plug and receptacle
connectors at aircraft. Tighten,
Repair or replace as required.
Check aircraft 400-Hz
components.
March 31/94 Revised
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