Cummins/Onan — High 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
- Open cabinet door of automatic transfer switch.
- Connect a DC voltmeter to the battery terminals.
- Pull out the battery charger module 6.
- Connect a separate battery charger to the battery.
- For the alarm setting, the battery should be charged until the voltage reaches approximately 14.5 volts for a 12-volt lead-acid battery, 29.0 volts for a 24-volt lead-acid battery, 15.5 volts for a 10
- Insert a small screwdriver into the HIGH opening of battery voltage sensor module 10 for adjusting potentiometer R9. Adjust to the on-off point for the HI BAT VOLT lamp. The lamp must stay lit at this
- Unplug or turn off the battery charger. The lamp must go out as soon as voltage drops a few tenths.
- Turn on battery charger. The lamp must light as voltage returns to value given in Step 5.
- Disconnect the battery charger and voltmeter.
- Insert battery charger module 6 into control panel.
- Close cabinet door.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- High battery voltage alarm settings: 14.5 volts for 12-volt Amazon eBay $11.99 FridayParts $65.01 lead-acid, 29.0 volts for 24-volt SinoCMP $247.50 lead-acid, 15.5 volts for 10-cell nickel-cadmium, or 31.0 volts for 20-cell nickel-cadmium.
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.