Cummins/Onan — Adjusting Undervoltage Sensors 306-0210 and 300-0780
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Open the cabinet door of the automatic transfer switch.
- Turn the pick-up voltage knob to the desired pick-up voltage; a setting giving pick-up at 90 percent of nominal voltage is usually satisfactory.
- Turn the drop-out differential knob to the desired percent deviation below the pick-up voltage; a setting of 15 percent is often satisfactory.
- Close the cabinet door.
Specs & values
- Pick-up 90 percent of nominal voltage; drop-out differential 5 percent to 20 percent
- Multiply knob readings by factor 1.0 (120 V), 2.0 (208 V), 2.0 (240 V), 4.0 (480 V), 5.0 (600 V)
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.