Generac Power Systems CorePower 6/7 kW 60 Hz Diagnostic Repair Manual page 91

ENGINE/DC CONTROL
Table 19. Components Resistance Values
Starter Contactor
Main Fuel Solenoid
Transfer Relay
Choke Solenoid
Procedure
1. Set a Volt-Ohm-Meter (VOM) to measure resistance.
2. Disconnect the J1 (J5 on CorePower) connector from the
controller.
3. Connect one meter lead to a clean frame ground and
connect the other meter test lead to each of the following
tests points in Table 20, measure and record the resistance.
Table 21 has been provided to record the results of this test.
Additional copies of this table can be found in Appendix A
"Supplemental Worksheets" at the back of this manual.
Table 20. Resistance Measurements
Test CorePower PowerPact
Point Pin Location Pin Location
1 J2 Pin 4 J5 Pin 13
2 J2 Pin 11 J5 Pin 14
3 J2 Pin 8 J5 Pin 18
Results
1. Compare the results of Step 3 with Table 20.
a. If the VOM indicated CONTINUITY at Test Point 1
proceed to Test 61
b. If the VOM indicated CONTINUITY at Test Point 2
proceed to Test 57
c. If the VOM indicated CONTINUITY at Test Point 3
proceed to Test 29
d. If the VOM indicated CONTINUITY at Test Point 4,
proceed to Test 63
e. If the VOM indicated proper resistance values at all test
points, replace the controller
Table 21. Test 73 Results
Test CorePower PowerPact
Point Pin Location Pin Location
1 J2 Pin 4 J5 Pin 13
2 J2 Pin 11 J5 Pin 14
3 J2 Pin 8 J5 Pin 18
PART 4
8Ω
16Ω
115Ω
4Ω
Circuit Value
Wire 14 16Ω
Wire 56 4Ω
Wire
OPEN
15B/194
Circuit Result
Wire 14
Wire 56
Wire
15B/194
TEST 74 – CHECK BATTERY CHARGER
SUPPLY VOLTAGE
Discussion
The battery charger is supplied with 120 VAC. The output of the
battery charger is 13.4 VDC (2.5A) on CorePower.
Procedure
Refer to Figure 83 for CorePower. Refer to the PowerPact SD/
WD for PowerPact.
1. Set VOM to measure AC voltage.
2. On CorePower, measure across points A and B. On
PowerPact, measure across J4-1 and J4-3 at the controller
connector. 120 VAC should be measured.
a. If 120 VAC is not measured;
CorePower: Verify that the load source voltage is
available, and that the duplex circuit breaker is on.
PowerPact: Verify that voltage is coming from the T1 in
the Transfer Switch.
b. If 120 VAC is measured, proceed to Step 3.
3. Measure across points C and D on both CorePower and
PowerPact. 120 VAC should be measured.
a. If 120 VAC is not measured;
CorePower: Repair or replace Wire BC LINE or BC 00
between the load center and the generator.
PowerPact: Repair or replace T1 Wire coming from the
Load Side of the Transfer Switch Contactor.
b. If 120 VAC is measured, refer to Flow Chart.
TEST 75 – CHECK BATTERY CHARGER
OUTPUT VOLTAGE (COREPOWER ONLY)
Discussion
The CorePower battery charger is supplied with 120 VAC. The
output of the battery charger is 13.4 VDC (2.5A).
Procedure
Refer to Figure 83.
1. Set VOM to measure DC voltage.
2. Remove and isolate battery charger black and red leads
from generator terminal strip points E and F.
3. Measure across points E and F. Battery supply voltage (12
VDC) should be measured.
a. If battery voltage is not measured, wait 5 minutes
and repeat Step 3. If battery supply voltage is still not
available, refer to Flow Chart.
b. If battery voltage is measured, proceed to Step 4.
4. Reconnect battery charger black and red lead wires
previously removed in Step 2.
5. Measure across points E and F. 13.4 VDC should be
measured.
Section 4.5
Diagnostic Tests
Page 89