OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2
Chapter 2-4
Page 18
Generator
Trouble, Symptom,
Condition
Probable Cause
Test, Check, and/or Remedy
1.
No (or low) voltage output
a.
Shorted diode in exciter
rectifier (CR2)
Check diodes in accordance with Section
2-3. If diodes are good, proceed to step b.
b.
Open or shorted exciter
rotor winding (G2)
Use ohmmeter to check for open or
shorted condition diodes in accordance
with Section 2-3. If exciter rotor windings
are good, proceed to step C.
c.
Open or shorted exciter field
windings (L2)
Check field resistance. See Section 2-3
for normal values.
d.
Open or shorted generator
rotor windings (L1)
Check resistance with ohmmeter to
determine if open or short circuited diodes
in accordance with Section 2-3
2.
Generator operates
single phase.
a.
Open or short circuited
winding in generator stator
(G1)
Check stator-winding resistances. See
Section 2-3 for normal values.
3.
Generator overheats
a.
Loose connection causing
high resistance
Check all output connections. Look for
discoloration caused by heat. Tighten or
replace as required.
b.
Improper or blocked
ventilation
Check for foreign material (rags, etc.)
blocking airflow. Provide adequate
ventilation.
c.
Generator stator windings
short circuited
Check stator windings. See Section 2-3.
4.
Unbalanced output
a.
Loose connection in output
circuit
Check all output connections. Discolored
connectors indicate a loose connection.
Tighten or replace as required.
b.
Open or short-circuited
phase
Check stator windings in accordance with
Section 2-3. Repair or replace as required.
c.
Defective connection in
output circuit
Check the plug and receptacle connectors
at aircraft. Tighten, repair, or replace as
required.
d.
Break or cut in output cable
assembly
Inspect the output cable for damage.
e.
Unbalanced load
Check the aircraft 400-Hz components.
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