Generac Power Systems 14 kW LP, 10 kW LP Test 81 Check to see if Low Speed Function is enabled

Section 4.4

Diagnostic tests

Part 4

DC control

d.If coil resistance was measured in CS and FS, and FS2 Wire 14 is shorted to ground between J2 connector and CS, FS, or FS2, repair or replace the shorted wire.

8.Disconnect Wire 14 from the Fuel Solenoid (FS) and Choke Solenoid (CS).

a.Connect one meter test lead to the FS terminal from which Wire 14 was removed. Connect the other meter test lead to the ground terminal. 16 ohms should be measured. If zero resistance was measured, replace the FS.

b.At the CS connector, connect one meter test lead to Wire 14. Connect the other meter test lead to Wire 90. 4 ohms should be measured. If zero resistance was measured, replace the Choke Solenoid.

c.If coil resistance was measured in the Choke Solenoid, and FS Wire 14 is shorted to ground between the J2 Connector and CS or FS, repair or replace the shorted wire.

9.Disconnect Wire 4 and Wire 0 from the Voltage Regulator (VR).

a.At the J2 connector, connect one meter test lead to Wire 4. Connect the other meter test lead to a clean frame ground. Note the resistance reading and compare to the rotor resistance in the front of this manual. If zero resistance was measured, test Wire 4 for a short to ground. Check brushes, slip rings, and rotor.

Test 81 – Check to see if Low Speed

Function is enabled

Discussion:

The Low speed exercise function when it is enabled allows the generator to exercise at 2400 rpm. If it is disabled it will exercise at its 3600 rpm during exercise.

Procedure:

1.Press the “ESC” key till the main menu is reached.

2.Press the right arrow key until “Edit” is flashing.

3.Press “Enter”

4.Press the right arrow key until “Exercise Time” appears on the controller.

5.Press “Enter”.

6.Press the right arrow key until the Low speed exercise option is displayed.

7.Ensure that it is enabled.

Results:

Refer back to flow chart.

Test 82 – Check operation of the

Choke Solenoid

Discussion:

The choke solenoid should be closed when it is in low speed exercise.

Procedure:

1.Remove the air box cover and filter from the engine.

2.Refer to test 79 for Test Exercise Function

3.When the generator starts and the display reflects that it is exercising, confirm that the choke solenoid is fully closed over one port.

Results:

1.If the solenoid did not close, confirm that utility voltage is present. If the generator believes that there is a power outage it will run at full speed until utility is returned.

2.If the solenoid closed, replace the controller.

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