Hobart 60PL20 Operation And Maintenance Manual page 98

OM-2053
TROUBLE, SYMPTOM
AND CONDITION
GENERATOR
1. No (or low) voltage
output
2. Generator operates
single phase
3. Generator
overheats
4. Unbalanced output
EXTERNAL LOAD
4. Unbalanced output
(Continued)
3-1
Page 20
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 circuited.
A. Loose connection in
output circuit.
B. Open or short circuited
phase
C. Defective connection
in output circuit.
D. Break or cut in out-
put cable assembly.
E. Unbalanced load
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. See
Sect. 2-3, Fig. 6 for normal values.
D. Check resistance with ohm-
meter to determine if open
or short circuited.
A. Check stator winding resis-
tances. See Sect. 2-3, Fig.
6 for normal values.
A. Check all output connec-
tions. Look for discolora-
tion 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. See
Sect. 2-3, Fig. 6.
A. Check all output connec-
tions. Discolored connectors
indicate a loose connection.
Tighten or replace as required.
B. Check stator windings in
accordance with 2-3, Para. 5
Repair or replace as required.
C. Check plug and receptacle
connectors at aircraft.
Tighten, repair, or replace
as required.
D. Inspect. Repair or replace
as required.
E. Check aircraft 400-Hz compo-
nents.
December 31/91 Revised