TM 9-6115-604-34
NAVFAC P-8-633-34
Table 2-4. Electrical Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2.
LOAD CRCUIT BREAKER CB101 FAILS TO CLOSE (CONTINUED).
Step 3.
Check and test circuit breaker trip relay K30 in accordance with paragraph 5-30 and check wiring using FO-7.
Repair or replace as necessary.
Step 4.
Check and test synchro check relay K116 in accordance with paragraph 5-38.
Repair or replace as necessary.
3.
GENERATOR G1 DOES NOT PRODUCE VOLTAGE.
WARNING
Lethal static charges may be on generator G1 lines T1, T2, T3, L1, L2, or L3 when generator
set is shut down. Using an insulated (fiberglass) rod with a ground metal tip, discharge
generator leads to ground prior to working on them.
Step 1.
Shut down generator set. Park load cables and remove rear access panel to cabinet B. Refer to
Figure 10-3. Discharge generator G1 leads T1, T2, T3, L1, L2, and L3 to ground using an insulated
(fiberglass) rod with grounded metal tip.
Step 2.
Check lead connections to lightning arresters E101, E102, and E103 and surge suppression
capacitor C101 for security.
Correct as necessary.
Step 3.
Install rear access panel to cabinet B. Check contact set 46 (field flashing) of crank relay K3 for
proper connection to battery positive in accordance with paragraph 5-28.
Replace crank relay K3 as necessary.
Test voltage regulator VR101 in accordance with paragraph 5-13.
If voltage regulator VR101 passes bench test but fails on equipment test, check all wiring to voltage
regulator VR101 and repair or replace as necessary.
Check crank relay K3, contact set 4-6 (field flashing) for proper connection to battery positive. Refer
to paragraph 5-28 for relay K3 test procedure. Replace K3 if defective.
Step 4.
Remove louvered cover from conduit box and inspect and test the rotating rectifier assembly in
accordance with paragraph 5-6.
Clean or repair in accordance with paragraph 57, step b.
If necessary, repair the rotating rectifier assembly in accordance with paragraph 5-7, step b.
Step 5.
Test generator G1 in accordance with paragraph 56.
If necessary, dry the generator in accordance with paragraph 5-4 or repair the generator in
accordance with paragraph 57.
2-16
