TM 9-6115-729-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
SYMPTOM
18.
Engine Not Properly Sharing Load With Other Generator Sets (Parallel Operation).
MALFUNCTION
Load Sharing Module Malfunction.
CORRECTIVE ACTION
STEP 1.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP set ENGINE CONTROL switch to START.
STEP 2.
Apply full load to generator set.
STEP 3.
Measure voltage LSM A4-22 (+) and A4-23 (-) (FO-4, sheet 2). If voltage not +6.0
Vdc 1.0 Vdc at full load, perform LSM A4 load gain adjustment (WP 0040) of
each generator set running isochronously not paralleled.
STEP 4.
Check frequency setting of all units when off line with no load. If not identical,
readjust frequency settings to be identical.
STEP 5.
On resistor assembly A7 Verify position of ISOCHRONOUS/DROOP switch
(TM 9-6115-729-10, WP 0006) and (FO-4, sheet 5).
STEP 6.
If in DROOP mode, go to step 7.
STEP 7.
On load resistor assembly A7 measure continuity between A7-2 and A7-1 (FO-4,
sheet 4). There should be no continuity. If continuity exists, replace
ISOCHRONOUS/DROOP switch (WP 0042).
STEP 8.
If ISOCHRONOUS/DROOP switch is good, keep switch in DROOP and go to
step 14.
STEP 9.
Place ISOCHRONOUS/Droop Switch in ISOCHRONOUS mode.
STEP 10.
On load resistor assembly A7 measure continuity between A7-2 and A7-1 (FO-4,
sheet 4). There should be continuity. If continuity does NOT exist, replace
ISOCHRONOUS/DROOP switch (WP 0042). If ISOCHRONOUS/DROOP switch
is good, go to step 11.
STEP 11.
Disconnect wires from LSM A4-13 (137A18,) and LSM A4-14 (139A18.) Set
Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL. On
EMCP set ENGINE CONTROL switch to START. On EMCP set Contactor
Control Switch (CCS) to Close. Verify AC Circuit Interrupter Lamp is illuminated.
STEP 12.
Check for continuity between LSM A4 wires 137A18 and 139A18.
a. If continuity is present, proceed to step 13.
b. If continuity is not present, replace main load contactor K1 (WP 0048).
STEP 13.
Reconnect wire 137A18 to LSM A4-13; reconnect wire 139A18 to LSM A4-14.
Operate set in ISOCHRONOUS mode. Apply load.
a. Problem caused by improper engine operation. Engine may not be
developing enough horsepower.
b. Go to Low power/poor or no response to throttle troubleshooting procedure
(SYMPTOM 22).
0011-20
