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TROUBLE, SYMPTOM
AND CONDITION
GENERATOR
1. No (or low) voltage
output
2. Generator operates
single phase
3. Generator
overheats
5. Unbalanced output
August 5/89 Revised
PROBABLE CAUSE
A. Shorted diode in
exciter rectifier
(CR2).
B. Open or shorted exci-
ter rotor winding
(G2)
C. Open or shorted exci-
ter field windings
(L2)
D. Open or shorted gen-
erator rotor windings
(L1)
A. Open or short cir-
cuited winding in
generator stator (G1)
A. Loose connection
causing high resis-
tance.
B. Improper or blocked
ventilation.
C. Generator stator
windings short cir-
cuited
A. Loose connection in
output circuit.
B. Open or short cir-
Trouble Shooting Chart (Sheet 19 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
A. Check diodes in accordance
with Sect. 2-3, para. 6. If
diodes are good, proceed to
step B.
B. Use ohmmeter to check for
open or shorted condition.
If exciter rotor windings
are good, proceed to step C.
C. Check field resistance.
for normal values.
D. Check resistance with ohm-
meter to determine if open
or short circuited.
A. Check stator winding resis-
tances. (See 2-3, Fig. 12)
for normal values.
A. Check all output connec-
tions. Look for discoloration
caused by heat. Tighten
or replace as required.
B. Check for foreign material
(rags, etc.) blocking air
flow. Provide adequate
ventilation.
C. Check stator windings.
A. Check all output connections.
Discolored connectors
indicate a loose connection.
Tighten or replace as
required.
B. Check stator windings in
OM-2031
3-1
Page 27
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