Product Manual A

6. Troubleshooting11-2017

When the digital display is not available, diagnosis of problems involves observing system operation. If

you cannot determine the problem, contact Cummins/Onan Service.

6.3.1 After A Power Failure, Generator Set Starts But Does Not

Assume Load

Sync check could be active and the sources could be out of sync, or TDNE or TDEL could be timing.

1. Check the output voltage of the power source by observing the voltmeter on the generator set.

WARNING

AC power within the cabinet and the rear side of the cabinet door presents a shock hazard

that can cause severe personal injury or death. When the cabinet door is open, use extreme

caution to avoid touching electrical contacts with body, tools, jewelry, clothes, hair, etc.

2. Check the Source 2 Available lamp on the ATS Control Panel. Check the parameter settings in

Setup.

3. Disconnect all AC power before manually transferring the switch.

4. Manually transfer the switch (see Operation). Call your dealer or distributor.

Check the transfer inhibit input, if this is active the ATS will not transfer. (Press the override button)

6.3.2 After Power Returns, Transfer Switch Does Not Return To

Normal Position

Sync check could be active and the sources could be out of sync, or TDEL could be timing.

1. The retransfer time delay period may not have expired. Press the override button.

WARNING

AC power within the cabinet and the rear side of the cabinet door presents a shock hazard

that can cause severe personal injury or death. When the cabinet door is open, use extreme

caution to avoid touching electrical contacts with body, tools, jewelry, clothes, hair, etc.

2. Stop the generator set with the Start/Stop switch. When the generator set stops, the transfer switch

transfers the load to Power Source 1 if power is acceptable.

3. If the switch still does not retransfer, manually return the switch to the Source 1 position (see

Operation). Call your dealer or distributor.

Check the retransfer inhibit input, if it is active the ATS won't transfer. (Press the override button).

6.3.3 Generator Set Continues to Run After Retransfer of Load

to Normal Power

The stop time delay function may not have expired. Wait for the duration of TDEC. If the generator still

doesn't stop, make sure the generator switch is in Auto then stop the generator set with its Start/Stop

switch and call your dealer or distributor.