Cummins/Onan — Adjusting Overvoltage 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
- Use the same multiplying factors for the knob readings as given under undervoltage sensors 306-0210 and 300-0780.
- Open the cabinet door of the automatic transfer switch.
- Turn the pick-up voltage knob to the desired pick-up voltage; a setting of 113 percent of nominal voltage is usually satisfactory.
- Turn the drop-out differential knob to the desired deviation below the pick-up voltage; a setting of 5 percent is often satisfactory.
- Close the cabinet door.
Specs & values
- Pick-up 113 percent of nominal voltage; drop-out differential 5 percent
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.