Hobart 9OC24S Operation Manual page 244

GENERATOR DIVISION
HOBART BROTHERS COMPANI
OPERATION, MJJNTENANcE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET', SPEC. NO. 5381A
TROUBLE ,SYMPTOM,
AND CONDITIONS
GENERATOR (CONTlt'
I n (Continued)
2. Generator A. An open or short circuited
operates single winding in generator
phase stator (GEN )
3. Generator over-
heats
4. Unbalanced output
PROBABLE CAUSE TEST, CHECK, AND/OR REMEDY
B. Open or shorted exciter
rotor winding (1EXC)
B. Use ohmmeter to check for open
or shorted condition. If exciter
rotor windings are good, proceed
to step C.
C. Open or shorted exciter m Check field resistance. See 2-3,
field windings (2FLD)
Fig. 4 for normal values.
D. Open or shorted generator Da Check resistance with ohmmeter
rotor windings (1 FLD) to determine if open or short
circuited e
Check stator winding resistances.
See 2-3, Fig. 4 for normal values.
A. Loose connection causing
high resistance
Check all output connections for
looseness. Look for discoloration
caused by heat. 'highten or re-
place as required.
B. Improper or blocked venti-
B. Check for foreign materials (rags,
lation etc.) blocking air flow. Provide
adequate ventilation.
C. Generator stator windings
0 Check statoi windings. See 2-3,
short circuited
Fig. 4.
A. Loose connection in output Check all output connections.
circuit
Discolored connectors indicate a
loose connection. Tighten or re-
place as required.
B. Open or short circuited
stator phase
B. Check stator windings in
accordance with 2-3, Para. 2 I
Do Repair or replace as required a
C e ,Defective connection
in output circuit
0 Check plug and receptacle con-
nectars at aircraft e Tighten I
repair, or replace, as required D
3-2
Page ?8
lrouble 3hooting
Lhart (bheet IL4 ot IY)
Figure 6
Ott 30/73