ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
17. AC VOLTAGE FLUCTUATES.
Step 1.
Step 2.
Step 3.
Step 4.
Loose electrical connection.
Inspect electrical system and make any repairs necessary (FO-1 and FO-2).
Defective Volt-Amps selector switch.
Replace Volt-Amps switch (para 4-63).
Defective voltage adjust rheostat.
Replace defective voltage adjust rheostat (para 4-63).
Defective ac voltmeter.
Replace ac voltmeter (para 4-63).
18. FREQUENCY FLUCTUATES.
Step 1. Erratic engine operation.
Refer to malfunction 5 of this table.
Step 2. Defective frequency adjust rheostat (class I sets only).
Replace frequency adjust rheostat (para 4-63).
Step 3. Defective frequency meter.
Replace frequency meter (para 4-63).
Step 4. Defective frequency transducer.
Replace frequency transducer (para 4-63).
19. MAIN AC CONTACTOR (CB2) WILL NOT CLOSE.
Step 1.
Step 2.
4-16
Defective circuit breaker switch S3.
Inspect test S3. Replace if defective (para 4-63).
Defective main load contactor (4-40).
Disconnect electrical connector (per J41, FO-1, sheet 4) from main load contactor (CB2). Start
generator set, while holding circuit breaker switch (S3) in closed position. Using a voltmeter, test
for 28 vdc at J41, receptalce A(+) and Receptalce B(-). If 28 vdc is present, inspect and test CB2
(para 4-62). Replace if defective. If 28 vdc is not present, notify higher level maintenance.
