Cummins/Onan OT-A-4060A / OT-C-10050C — Undervoltage Sensor Calibration
Adjustments · Power Sentry voltage sensor module
For the Cummins/Onan OT-A-4060A / OT-C-10050C, from the Cummins/Onan service manual.
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Before you start
- AC power within the cabinet and the rear side of the cabinet door presents a shock hazard.
- Disable the linear motor by placing the Motor Disconnect switch in the Off position before making adjustments.
Procedure
- Check that nominal voltage is present on all phases of the source being calibrated.
- Turn the Undervoltage Pickup and Dropout potentiometers fully clockwise.
- Turn the Undervoltage calibration (Cal) potentiometer fully clockwise; the Source Available lamp should be on.
- Turn the Undervoltage Cal potentiometer counterclockwise until the Source Available lamp turns off.
- Slowly turn the Undervoltage Cal potentiometer clockwise until the Source Available lamp just turns on again.
- The undervoltage sensor is now calibrated; recalibrate the overvoltage sensor if it was adjusted in step 3.
Tools required
- Screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pickup range: 85% to 100% of nominal voltage
- Dropout range: 75% to 98% of pickup voltage
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.