Cummins/Onan — Undervoltage Sensor Calibration (Control Package A)
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
- Move the calibration switch (S4) to the CAL position (100% pickup setting).
- Turn on Normal source and check for nominal voltage.
- Slowly turn the Normal calibration (Cal) potentiometer clockwise until the Normal Available lamp just turns ON.
- Turn on Emergency source and check for nominal voltage.
- Slowly turn the Emergency calibration (Cal) potentiometer clockwise until the Emergency Available lamp just turns ON.
- Move the calibration switch to the 85% position (sets 85% pickup and 75% dropout).
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- CAL setting = 100% pickup
- 85% position = 85% pickup and 75% dropout
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.