Cummins/Onan — Manual Operation of the Transfer Switch
Operation
From a Cummins/Onan service manual — check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Before you start
- 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. Use extreme caution to avoid touching electrical contacts whenever the cabinet door is open.
- If possible, remove all AC power before manually operating the switch; if not, follow NFPA 70E safety-related work practices.
- Automatic transfer switch operation results in rapid movement of the manual operator handles; keep hands clear when switching back to automatic operation.
Procedure
- Open the cabinet door of the automatic transfer switch.
- Move the Motor Disconnect switch to the Off position.
- To transfer from Source 1 to Source 2: pull the upper manual operator handle down, then push the lower handle down.
- To retransfer from Source 2 to Source 1: pull the lower handle up, then push the upper handle up.
- Move the Motor Disconnect switch to the Auto position.
- Close and lock the cabinet door.
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.