Generac Power Systems 8 kW LP User Manual

Page 135

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sEctioN 4.4

DiaGNostic tEsts

Page 133

CHOKE SOLENOID

CHOKE PLATE

Figure 22. Solenoid De-Energized, Choke Closed

12-20 kW Units

CHOKE SOLENOID

CHOKE PLATE

Figure 23. Solenoid Energized, Choke Open

12-20 kW Units

3. Set a VOM to measure DC voltage.
4. Connect the positive (+) test lead to Wire 14 (Pin 1) of the

C3 Connector going to the control panel (Female Side).

Connect the negative (-) test lead to Wire 90 (Pin 2).

5. Set the AUTO-OFF-MANUAL Switch to MANUAL. While

cranking, battery voltage should be measured cyclically.

If battery voltage was not measured, verify continuity

of Wire 90 between the C3 Connector and the printed

circuit board J1 Connector, Pin Location J1-23. Verify

continuity of Wire 14 between the C3 Connector and

J2 connector Pin Location J2-3. Repair or replace any

wiring as needed.

6. Disconnect C3 Connector. Set a VOM to measure resis-

tance. Connect the positive (+) test lead to Wire 14 (Pin

1) of C3 Connector going to the choke solenoid (Male

Side). Connect the negative (-) test lead to Wire 90 (Pin

2). Approximately 3.7 ohms should be measured.

7. With the generator running at a speed of approximately

60 Hertz, verify that the choke is energized and hold-

ing the choke plate open. Repeat Step 2 procedure,

however, once the unit starts, manually hold the choke

open while taking the voltage measurement.

CHOKE PLATE

CHOKE SOLENOID

CHOKE HOUSING

Figure 24. Exploded View Showing Location of Choke

Plate - 10 kW Units

FEMALE SIDE

MALE SIDE

2

1

1 2

90

90

14

14

Figure 25. C3 Choke Solenoid Connector

RESULTS:

1. If Battery voltage was not measured in Step 5 and wire

continuity is good, replace the printed circuit board.

2. If Choke Solenoid coil resistance is not measured in

Step 6, replace the Choke Solenoid.

PROCEDURE: 8 kW UNITS

1.

Operational Check: Set the AUTO-OFF-MANUAL

Switch to MANUAL. While cranking the choke solenoid

should energize and pull the choke plate closed. If the

choke solenoid does not pull in, verify that the choke

can be manually closed. There should be no binding or

interference.

DC CONTROL

Part 4

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