Generator - Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set

Generator

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