STEP 4.

If problem not resolved, perform VOLTAGE rheostat test (WP 0040).

STEP 5.

Verify that correct parameters are entered in DVR and that parameters match the

reconnection board position (WP 0085).

STEP 6.

Enter proper parameters (WP 0085). Verify parameters after entry.

STEP 7.

With generator set running, measure AC voltage between pins A3-26 and A3-28,

A3-28 and A3-30, and A3-26 and A3-30 per FO-4, sheet 3.

STEP 8.

If voltages not 95 to 120 Vac at all three locations, shut down generator set.

STEP 9.

Check fuses F1-10A, F2-10A, F3-10A and replace defective fuses.

a. Open fuse holder F1, F2, and F3.

b. Check resistance, F1-1 to F2-1, F2-1 to F3-1, and F3-1 to F1-1. Resistance

should be less than 1 ohm. If open or above 1 ohm, troubleshoot wires

between F12, F2, and F3 to TB1 and alternator.

c.

Check resistance, F1-2 to F2-2, F2-2 to F3-2, and F3-2 to F1-1. Resistance

should be between 0.2 to 0.4 ohms. If open or above 0.4 ohms, troubleshoot

wires between F12, F2, and F3 and transformer PT2 and PT3, and

transformer primary winding, PT2, PT3 before removing wires from A3-26,

A3-28, and A3-30.

STEP 10.

Check resistance, A3-26 to a3-28; A3-28 to A3-30, and A3-30 to A3-26.

Resistance should be between 0.2 and 2.0 ohms. If open or above 2 ohms,

troubleshoot secondary winding of PT2 and PT3 and wires between A3-26,

A3-28 and A3-30 to PT2 and PT3.

STEP 11.

Measure AC voltage between pins A3-20 and A3-22, A3-22 and A3-24, and

A3-20 and A3-24.

STEP 12.

Voltages should be the same and at the proper ratio to the output voltage in

accordance with parameter :02. If not, test generator (WP 0096).

STEP 13.

If the problem is not resolved, replace DVR (WP 0041).

8.

Code 703

Overexcitation

STEP 1.

If operating in parallel, re-parallel the generator sets in accordance with

TM 9-6115-729-10.

STEP 2.

Start generator set and verify that problem has been resolved with no load.

STEP 3.

If the problem does not exist with no load, verify that generator set is not

overloaded. Reduce load below rated generator set load.

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