Cummins/Onan — Transfer Switch Test
Testing & diagnosis · Transfer switch, control, and generator
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Use care when opening cabinet door. High voltages within cabinet and rear side of cabinet door present a serious electrical shock hazard.
Procedure
- If optional exerciser is included, open cabinet and move the With Load/Without Load selector switch to the WITH LOAD position.
- Verify that the bypass switch handle is in the AUTOMATIC position.
- Move the Test/Normal/Retransfer switch to the TEST position; generator set should start and load should transfer after preset time delays.
- Check operation of the AC meters on the cabinet (if equipped).
- Move the Test/Normal/Retransfer switch to the NORMAL position; load should retransfer and generator set should stop after preset time delays.
Specs & values
- Red Emergency Source and Transfer-Switch-Position lamps should be ON after transfer
- Green Normal Source and Transfer-Switch-Position lamps should be ON after retransfer
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.