TM 9-6115-730-24
0010
TROUBLESHOOTING USING FAULT CODES - Continued
NOTE
The DVR detects that there is no AC frequency present for 200 ms while the measured voltage is
greater than 50% of nominal.
SYMPTOM
12.
Code 803
MALFUNCTION
Loss of Frequency
CORRECTIVE ACTION
STEP 1.
Check fuses F1, F2, or F3 per FO-1, sheet 4 and FO-3, sheet 1.
STEP 2.
Replace fuses F1, F2, or F3, as required (WP 0055).
STEP 3.
Troubleshoot wiring harness.
a. Check and repair wiring between PT2, PT3 and DVR, as required
b. Check and repair wiring between PT2, PT3, and fuses F1, F2, and F3, as
required (WP 0088).
c.
Check and repair wiring between fuses (F1, F2, and F3) and generator, as
required (WP 0088).
d. Remove fuses F1, F2, and F3. Measure resistance between F1 terminal 2
and F2 terminal 2. If not 0.3 +/- 0.1 ohms, replace transformer PT2
e. Measure resistance between F2 terminal 2 and F3 terminal 2. If not 0.3
+/- 0.1 ohms, replace transformer PT3 (WP 0053).
f.
Measure resistance between F3 terminal 2 and F1 terminal 2. If not 0.6
+/- 0.1 ohms, check all connections on transformers (WP 0053).
g. Measure resistance between J31-5 and J31-6. If not 0.3 +/- 0.1 ohms,
replace PT2 (WP 0053).
h. Measure resistance between J31-6 and J31-7. If not 0.3 +/- 0.1 ohms,
replace PT3 (WP 0053).
i.
On EMCP, set Engine Control Switch to OFF/RESET to clear bus fault.
STEP 4.
Install fuses F1, F2, and F3 (WP 0055).
STEP 5.
Start generator set and measure AC voltage between pins A3-26 and A3-28,
A3-28 and A3-30, and A3-26 and A3-30. Verify 95 to 120 Vac present at all three
locations.
STEP 6.
0010-12
