Cummins/Onan NTA855 — Ground Fault Relay Test

Testing & diagnosis · Optional Ground Fault Alarm Relay (GFR)

For the Cummins/Onan NTA855, from the Cummins/Onan service manual.

Applies to: Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan NTA855, Cummins/Onan LTA10 engine, Cummins/Onan NT855 engine, Cummins/Onan NTA855 engine

Procedure

1. Verify that the N-G Fault Indicator on the GFR is not lit; if lit, the neutral-to-ground bonding jumper circuit is open.
2. Move the control switch to the Run position.
3. Press the TEST switch on the ground fault relay.
4. Verify that the control panel warning message is displayed and the Fault Indicator (>I) on the GFR is lit.
5. Reset the control panel fault, which also resets the ground fault relay.

Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →

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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