TM 9-6115-729-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
SYMPTOM
12.
Generator Produces Fluctuating Voltage.
MALFUNCTION
DVR 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.
Check current in each leg of output. Current should be much less than rated
current and the same in each leg.
STEP 3.
If current is too close to rated current, generator is overloaded. Reduce load or
add generator set in parallel.
STEP 4.
If current is not equal in all legs selectively turn off loads until balanced.
STEP 5.
Reconfigure loads as necessary or check for load failure.
STEP 6.
Check engine speed using tachometer: 1800 RPM (60 Hz) and stable. 1500
RPM (50 Hz) and stable.
STEP 7.
If engine speed follows voltage fluctuations, go to Engine misfires, runs rough, or
is unstable troubleshooting procedure (SYMPTOM 21).
STEP 8.
Check load(s) for fluctuations.
a. Disconnect one load at a time until unstable load is determined.
b. Repair or replace unstable load, or reconfigure system to accommodate load.
c.
If all loads are stable, on EMCP set ENGINE CONTROL switch to
OFF/RESET. Set Battery Disconnect Switch to OFF. Set DEAD CRANK
SWITCH to OFF.
d. Replace DVR (WP 0041 Guide) and retest system.
e. If DVR replacement does not resolve problem, replace generator (WP 0097).
STEP 9.
Verify the problem has been resolved.
0011-15
