TM 9-6115-730-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
NOTE
Zero volts or zero amperes is showing on the GSC display for one or more AC phases while the
generator set is running and the load is connected. Separate fault isolation is provided for zero
voltage and zero current readings.
SYMPTOM
4.
Display Of Voltage on GSC is Zero For One or More Phases.
MALFUNCTION
GSC Malfunction.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Check fuses A5F1, A5F2, and A5F3 on AC transformer box (ATB) A5 (FO-4,
sheet 3). Replace fuses, as required (WP 0042).
STEP 3.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP set ENGINE CONTROL switch to MANUAL START. Do not connect a
load.
NOTE
Voltage should correspond with reconfiguration board settings line-to-line.
STEP 4.
Measure the line-to-line voltage between the fuses on ATB A5. If voltages are not
correct, repair or replace wiring between generator and ATB A5 (WP 0044 and
STEP 5.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 6.
Disconnect P7 from rear of GSC (FO-4, sheet 1.
a.
Measure resistance between P7-16 and P7-10. If resistance is not 6 to 8
ohms, replace ATB A5 (WP 0042).
b.
Measure resistance between P7-16 and P7-11. If resistance is not 6 to 8
ohms, replace ATB A5 (WP 0042).
c.
Measure resistance between P7-16 and P7-12. If resistance is not 6 to 8
ohms, replace ATB A5 (WP 0042).
STEP 7.
Reconnect P7 to rear of GSC (FO-4, sheet 1).
STEP 8.
Remove A5F1, A5F2 and A5F3 fuses from ATB A5.
a.
Measure resistance between A5F1 and A5F2 on A5 side. If resistance is
not 2150 +/- 100 ohms, replace ATB A5 (WP 0042).
b.
Measure resistance between A5F2 and A5F3 on A5 side. If resistance is
not 2150 +/- 100 ohms, replace ATB A5 (WP 0042).
c.
Measure resistance between A5F1 and A5F3 on A5 side. If resistance is
not 2150 +/- 100 ohms, replace ATB A5 (WP 0042).
0011-6
