TM 9-6115-729-24
0010
TROUBLESHOOTING USING DVR FAULT CODES - Continued
CORRECTIVE ACTION - Continued
STEP 3.
Verify that G1F1 is connected to TB5 terminal 2 and G1F2 is connected to TB5
terminal 1.
STEP 4.
Disconnect wire from DVR A3 terminal F2. Check continuity between A3F2 and
TB1-5 terminal 1. If continuity does not exist, repair or replace wiring harness as
necessary (WP 0090).
STEP 5.
If continuity exists, replace rotating diodes (WP 0096).
STEP 6.
If replacing rotating does not resolve the problem, troubleshoot and repair main
generator (G1).
WARNING
Dangerously high voltage can exist across current transformer (CT) output with engine running.
CT could explode if disconnected from load with engine running. Do not disconnect CT with
generator rotating. Failure to comply can cause serious injury or death to personnel.
NOTE
The DVR detected a 0.4 per unit or greater leading reactive power for a time greater than the
value entered in reverse VAR trip time (parameter :20). This fault shuts down the DVR and
removes excitation from the field. This function is only active if parameter :21 is set to 2. This
function is inactive if parameter :22 is set to 1.
SYMPTOM
5.
Code 604
MALFUNCTION
Reverse VAR (Alarm Fault)
CORRECTIVE ACTION
STEP 1.
Two connections reversed could cause this fault. Verify current transformer
CCCT and voltage inputs from PT2, PT3, and DVR terminals 20, 22, and 24 are
connected per FO-3 and FO-4.
STEP 2.
Retrieve and verify all DVR parameters (WP 0085). Record :04 (generator rated
current) and :05 (current transformer output at rated output current) values.
STEP 3.
On EMCP set ENGINE CONTROL switch to MANUAL START.
STEP 4.
Connect load at 25% to 50% of rated load. Use 0.8 power factor inductive load, if
possible.
STEP 5.
On GSC measure current in phase B. Record value.
STEP 6.
Measure AC voltage between terminals A3-5 and A3-6 of DVR per FO-4,
sheet 3. Record value.
a. The voltage measured, divided by the value in parameter :05 should be
roughly equal to the measured current divided by parameter :04.
b. If not approximately the same, replace DVR (WP 0041).
0010-4
