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Table 2-2. Generator Set Troubleshooting (Cont) - TM-5-6115-545-34_98
Table 2-2. Generator Set Troubleshooting (Cont) - TM-5-6115-545-34_100
TM-5-6115-545-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 30 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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Table 2-2.
Generator
Set Troubleshooting (Cont)
Malfunction
18.
Main generator
output
voltage too low.
19.
Main generator
output
too high.
20.
Main generator noisy.
21.
Main generator
frequency
fluctuates or drifts.
22.
Main
generator
fails to
flash.
Probable cause
f
.
Rotating diodes
defective.
Exciter-regulator
defective.
a
.
Defective
bearing.
b.
Generator fan
—
loose or
defective.
a.
Governor system
—
defective.
b
.
Engine mal-
functioning.
a
.
Field flash
circuit defective.
b
.
Defective
exciter rotor.
c
.
Defective
exciter stator.
d
.
Defective
rotating
diodes
.
e
.
Defective
generator stator.
f.
Defective
—
speed switch.
g
.
Defective
excitation
assembly.
Corrective action
f
.
Check diodes (para 9-3). Re-
place diodes as required.
(Operator and Organizational
Maintenance Manual).
Check exciter regulator
(para 8-3). Replace
exciter voltage regulator
(para 8-10 thru 8-14).
a
.
Replace bearing (para 9-2
and 9-6).
b
.
Inspect generator fan.
Tighten, repair or replace
fan (para 9-2, 9-3 and 9-6).
a
.
Adjust governor system (para
7-2). Repair or replace as
required (para 7-3 thru 7-6).
b
.
See items 4, 5, and 6.
a
.
Check field flash
relay
(K5)
(fig.1-11).
Disconnect
battery negative . Disconnect
J9 on regulator. Apply 24 Vdc
to terminals 13(+)and 15(-) on
A5 assembly. Check
continuity
between terminals 1-14 and 2-15.
If circuit is open, replace K5
relay
on A5.
Check R219 and
CR207 in exciter regulator
(para 8-3). Replace defective
components as required (para
8-10 thru 8-14).
b
.
Check
resistance
of exciter rotor.
Check for short or ground. Re-
place as required. (para 9-2,
9-3,9 -5,9-6 and 9-7).
c
.
Check
resistance
of exciter
stator. Check for short
or ground (para 9-2).
Replace as required. (para 9-2,
9-3, 9-5, 9-6 and 9-7).
d
.
Check rotating diodes (para
9-3). Replace any defective
diode (para 9-2 and 9-6).
e.
Check generator - stator resis-
—
Check for short or ground
para 9-2).
Repair or rebuild as required.
(para 9-3,9 -4,9-6 and 9-7).
f
.
Check S9-1, normally open, for
proper operation (para 14-19).
g
.
Check R225 and R226
(para 8-12).
Change 5
2-15
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