Test 69 - Test Transfer Relay Circuit; Test 70 - Check To See If Low Speed; Function Is Enabled; Test 71 - Check Operation Of The Choke Solenoid - Generac Power Systems 7 kW NG Repair Manual

ENGINE/DC CONTROL
2. Disconnect Wire 56 and 0 from the starter contactor relay
(SCR).
3. Connect one meter test lead to the SCR terminal from
which Wire 56 was removed. Connect the other meter
test lead to the terminal from which Wire 0 was removed,
measure and record the resistance.
4. Refer to Figure 157 in reference to the CS connector.
Connect one meter test lead to Pin 1 and the other meter
test lead to Pin 2, measure and record the resistance.
90 56
2 1
FEMALE SIDE
Figure 157. CS Choke Solenoid Connector
Results
1. If the VOM indicated CONTINUITY in Step 3, replace the
SCR relay.
2. If the VOM indicated CONTINUITY in Step 4, replace the
CS solenoid.
3. Refer to Table 24. If the VOM indicated the correct
resistance for the component, a short to ground exists on
Wire 56. Repair and replace Wire 56 as needed.
TEST 69 – TEST TRANSFER RELAY CIRCUIT
Discussion
Wire 194 provides 12 VDC for the transfer relay (TR1). If the
VOM indicated CONTINUITY in the previous test, one of the
possible causes could be a faulty relay.
Procedure
1. Set a Volt-Ohm-Milliammeter (VOM) to measure
resistance.
2. Disconnect Wire 194 and 23 from TR1 relay located inside
the transfer switch.
3. Connect one meter test lead to terminal "A" on the relay
and connect the other meter test lead to terminal "B",
measure and record the resistance.
Results
1. If the VOM did not indicate 120 ohms of resistance in Step
3, a short to ground exists on Wire 194 between the TR1
relay and the J4 connector. Repair and replace as needed.
PART 4
56 90
1 2
MALE SIDE
2. If the VOM indicated CONTINUITY in Step 3, replace the
TR1 relay.
TEST 70 – 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 71 – 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 65 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 did not close during low speed (quiet test)
exercise, and Utility power was available, refer back to
Test 53.
Section 4.5
Diagnostic Tests
Page 139