Cummins/Onan OT UCD 280 — Single Actuator Manual Operation, 400-1000 Ampere Transfer Switch
Operation · Manual operator handles
For the Cummins/Onan OT UCD 280, from the Cummins/Onan service manual.
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Before you start
- Use extreme care when operating the transfer switch manually. High voltage on transfer switch terminals presents a serious personal injury hazard.
Procedure
- Move the motor disconnect switch to the DOWN, manual operation position.
- Transfer, from normal power to the emergency power source: pull the upper manual operator handle down.
- Transfer: push the lower manual operator handle down.
- Retransfer, from emergency power to the normal power source: pull the lower manual operator handle up.
- Retransfer: push the upper manual operator handle up.
- Automatic Transfer Switches: return the transfer switch to its preferred position.
- Return the motor disconnect switch to the UP, automatic operation position.
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.