Cummins/Onan OT UCD 280 — Programmed Transition Time Delay Adjustment
Adjustments · Programmed transition time delay relay
For the Cummins/Onan OT UCD 280, from the Cummins/Onan service manual.
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Before you start
- Be sure to move the operation selector switch to STOP, disconnect starting battery, and remove AC line power before attempting adjustments. Otherwise, the automatic transfer switch presents a serious shock hazard.
Procedure
- Open cabinet of Series OT transfer switch.
- Move the operation selector switch to STOP and disconnect the generator set starting battery.
- Remove AC line power to the transfer switch.
- With automatic transfer switches, remove the twist-lock disconnect plug and open the control accessory panel.
- Locate the time delay relay in the rear of the cabinet on the transfer switch base assembly.
- Turn the knob clockwise to increase delay (increments marked on knob), counterclockwise to decrease time delay.
- With automatic transfer switches, close the control accessory panel and reconnect the twist-lock disconnect plug.
- Restore AC line power to the transfer switch.
- Move the operation selector switch to NORMAL or RMT, whichever applies.
- Reconnect the generator set starting battery.
- Close the OT transfer switch cabinet door.
Specs & values
- Delay adjustable from 0.5 to 5 seconds
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.