Cummins/Onan ATUC A 800 - 4X / 111 — Battery Float Charge Adjustment

Adjustments · Battery charger module 6

For the Cummins/Onan ATUC A 800 - 4X / 111, from the Cummins/Onan service manual.

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Procedure

1. Connect the fully-charged battery (verify charge condition with the hydrometer).
2. Connect the voltmeter directly to the battery terminals.
3. Measure battery voltage. If above recommended float voltage, go to step 4; if below, go to step 7.
4. Open right cabinet door of automatic transfer switch.
5. Insert a small screwdriver through the hole in battery charger module 6; turn counterclockwise in small increments to decrease float voltage.
6. After five minutes, measure battery terminal voltage again; repeat steps 5 and 6 until voltage stabilizes. Proceed to step 11.
7. Open right cabinet door of automatic transfer switch.
8. Note charge current rate on charge ammeter on meter-lamp panel.
9. Insert a small screwdriver through hole in module 6; turn clockwise in small increments to increase float voltage.
10. In approximately one hour or when charge current decreases to the initial value, recheck battery terminal voltage; repeat steps 8 through 10 until stable.
11. Check the battery with a hydrometer and terminal voltage periodically during the first few weeks; readjust float charge rate if necessary.
12. 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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