Cummins/Onan — Undervoltage Sensor Calibration (Control Package B)
Adjustments · Electronic control voltage sensors
From a Cummins/Onan service manual covering: LT 100, LT 150, LT 200, LT 260, LT 30, LT 60. Check it applies to your exact model before use.
Applies to: Cummins/Onan TGHAA
Before you start
- AC power within the cabinet and the rear side of the cabinet door presents a shock hazard.
Procedure
- Normal source: turn Normal Pickup pot fully clockwise to 100% pickup.
- Turn Normal calibration (Cal) pot fully counterclockwise.
- Turn Normal Dropout pot fully clockwise to 97% dropout.
- Turn on Normal source and check for nominal voltage.
- Slowly turn the Normal Cal potentiometer clockwise until the Normal Available lamp just turns ON.
- Emergency source: turn Emergency Pickup pot fully clockwise to 100% pickup.
- Turn Emergency Cal pot fully counterclockwise.
- Turn Emergency Dropout pot fully clockwise to 97% dropout.
- Turn on Emergency source and check for nominal voltage.
- Slowly turn the Emergency Cal potentiometer clockwise until the Emergency Available lamp just turns ON.
- Turn off both power sources. Proceed to Undervoltage Pickup and Dropout Adjustments.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pickup adjustable 85% to 100% of nominal voltage
- Dropout adjustable 75% to 98% of pickup voltage
Full service-parts list: Cummins/Onan TGHAA →
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.