Service manual

9-2013 9. Troubleshooting
Possible Causes: Wire connections, faulty positional switch, faulty transfer switch
component(s)
Diagnosis & Solution:
1. Verify that the main AC circuit breaker on generator set is to “On".
2. Verify that the Last Fault is FC 79: Yes, continue diagnosis; No, troubleshoot actual last
fault.
3. Manually start an exercise session and verify the transfer switch position during the
exercise.
4. Disable the generator by placing the generator local start switch in the “Off" position.
5. Manually operate the transfer switch via lever to the generator position; check for generator
position switch continuity to ground at the transfer switch.
6. Check for continuity from the transfer terminal block position (TB4-6) to the generator
position terminal (J2-5).
7. Check for a ground signal at the generator position terminal (J2-5) at the control connector;
repair wiring as necessary.
8. Disconnect the generator set control J1 connector, verify that the J1 pins are fully inserted
and inspect pin condition using the steps below:
• Use the test points of the tester tool #420-0603
• Use mating pin connector, a pin gauge of the same size (.045") as the mating control
connector pin, or any suitable device that will not damage the inside contact wipers of
the pin socket
• Insert, repair, or replace pins as necessary.
A030A239 (Issue 10) 107