Guardian Technologies 4760, 4456 TEST 68 - CHECK BATTERY CHARGE WINDING HARNESS, Section, Part

SECTION 4.4

DIAGNOSTIC TESTS

PART 4

DC CONTROL

Figure 33. Battery Charge Relay Test Points

TEST 67 - CHECK BATTERY CHARGE RELAY

(BCR)

DISCUSSION:

The battery charge relay is used to switch the AC source delivered to the battery charger. When the BCR is de-energized, the Normally Closed (NC) contacts deliver AC power from the transformer. When the BCR is energized by Wire 14, the Normally Open (NO) contacts close and battery charge winding AC source is delivered to the battery charger.

PROCEDURE:

1.See Figure 33. Disconnect all wires from the battery charge relay, to prevent interaction.

2.Set a VOM to its "R x 1" scale and zero the meter.

3.Follow the chart below and test each set of contacts. Connect the VOM test leads to the relay terminals indicated in the chart provided below.

4.To energize or de-energize the relay. Connect a jumper wire to a positive (+)12VDC source and to relay Terminal "A". Connect a jumper wire to the negative (-) 12VDC source and to relay Terminal "B". The relay will ENERGIZE. Disconnect the positive jumper from Terminal "A" of the relay and the relay will DE-

ENERGIZE.

RESULTS:

1.Replace the battery charge relay if it fails any of the steps in this chart.

2.If the BCR tests good, but still does not function during generator operation, check Wire 14 and Wire 0 connected to the BCR.

a.Set a VOM to measure DC volts. Disconnect Wire 14 from BCR Terminal A. Connect the positive (+) test lead to Wire 14. Connect the negative (-) test lead to a clean frame ground. Set the AUTO-OFF-MANUAL switch to MANUAL. Battery voltage should be measured. If battery voltage is not measured, repair or replace Wire 14 between the BCR and the 4-tab terminal block.

b.If voltage was measured in a, set the VOM to measure resistance. Disconnect Wire 0 from BCR Terminal B. Connect one test lead to Wire 0. Connect the other test lead to a clean frame ground. CONTINUITY should be measured. If CONTINUITY was not measured, repair or replace Wire 0 between the BCR and the ground terminal.

TEST 68 - CHECK BATTERY CHARGE

WINDING HARNESS

DISCUSSION:

This test will check the continuity of Wire 66 and Wire 77 between Connector C2 and the battery charge relay.

PROCEDURE:

1.Disconnect Connector C2 from the side of the control panel.

2.Disconnect Wire 66 from Terminal 6, and Wire 77 from Terminal 4 of the BCR.

3.Set a VOM to measure resistance.

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