Cummins/Onan LS-15M — Generator Set Grounding Procedure
Maintenance
For the Cummins/Onan LS-15M, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFAA, Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DFE
Before you start
- Do not perform these procedures unless fully trained in medium voltage grounding procedures and have necessary safety equipment. Severe injury or death due to high voltage electrical shock may result.
- Hazardous voltage. After DC voltage from the test equipment has been applied to the windings and ground, there will be a definite static charge on the windings. Reconnect Grounding Cluster to remove static charge from the winding after each generator test.
Procedure
- Open, lock-out and tag-out all sources of power to the immediate work area.
- Disable the starting system: disconnect battery charger from AC source.
- Remove the negative battery cable and install a lockout device on the cable end.
- Put on high voltage gloves with leather protectors.
- Using two pre-tested voltage detection devices, verify de-energized condition.
- Remove the metal cover from the generator output box to access load terminals.
- Install the Grounding Cluster ground clamp to a verified grounded conductor.
- Leave grounds connected for at least one minute so static charge can dissipate.
- When work is complete, remove the Grounding Cluster in reverse order.
- After clearance from all personnel, remove all lock-out devices in reverse order.
Tools required
- Two pre-tested voltage detection devices Amazon
- High voltage gloves with leather protectors Amazon
- Grounding Cluster Amazon
- Lockout device Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DFE →
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.