Cummins/Onan OT-A-4060A / OT-C-10050C — Overvoltage 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.
Procedure
- Calibrate the undervoltage sensor before proceeding if it has not been calibrated.
- Check that nominal voltage is present on all phases of the source being calibrated.
- Turn the Overvoltage Dropout and Delay potentiometers fully counterclockwise.
- Turn the Overvoltage Cal potentiometer fully clockwise; the Source Available lamp for the selected source should light.
- Turn the Overvoltage Cal potentiometer counterclockwise until the Source Available lamp turns off.
- Slowly turn the Overvoltage Cal potentiometer clockwise until the Source Available lamp just turns on again.
Tools required
- Screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Dropout range: 105% to 135% of nominal voltage
- Delay range: 0 to 120 seconds
- Pickup point is fixed at 5% below the overvoltage limit point
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.