Cummins/Onan — Low Battery Voltage Alarm Setting

Adjustments · Battery voltage sensor module 10

From a Cummins/Onan service manual — check it applies to your exact model before use.

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Procedure

1. Open the cabinet door of the automatic transfer switch.
2. Connect a DC voltmeter to the battery terminals.
3. For the alarm setting, the battery should be charged until the voltage reaches approximately 12.9 to 13.3 volts for the 12-volt lead-acid battery, 25.8 to 26.6 volts for the 24-volt lead-acid battery,
4. Insert a small screwdriver into the LOW opening of battery voltage sensor module 10 for adjusting potentiometer R17. Adjust to the on-off point for the LO BAT VOLT lamp. The lamp must stay off.
5. Pull out the battery charger module 6. The lamp must light when the battery terminal voltage drops to 12.6 volts for the 12-volt battery, 25.2 volts for the 24-volt battery, 12.6 volts for the 10-cell
6. Insert battery charger module 6 back into its normal position. The LO BAT VOLT lamp must go out as the terminal voltage returns to values listed in Step 3.
7. Disconnect the voltmeter from the battery terminals.
8. Close the cabinet door.

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.

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