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Home›Repair guides›Cummins/Onan›Individual Generator Set Startup

Cummins/Onan — Individual Generator Set Startup

Installation

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

Applies to: Cummins/Onan DGBB, Cummins/Onan DGBC, Cummins/Onan DGCA, Cummins/Onan DGCC, Cummins/Onan DGDA, Cummins/Onan DGDB, Cummins/Onan DGEA, Cummins/Onan DGFA, Cummins/Onan DGFC

Before you start

  • Use extreme caution when performing phase relationship testing; the system is energized.

Procedure

  1. Place the RUN/OFF/AUTO switch in the OFF position.
  2. Connect starting and control batteries and verify no fuses are blown.
  3. Verify stationary battery chargers are properly installed and wired, then turn them on.
  4. Connect a jumper to the idle terminals in the accessory box.
  5. Start the set in RUN and run at idle until coolant temperature is greater than 100 deg F (40 deg C).
  6. Stop the set, remove the idle jumper, restart and observe acceleration to rated frequency and voltage.
  7. Calibrate and adjust all generator set metering; adjust to proper voltage and frequency.
  8. Verify paralleling breaker is charged and bus is de-energized; manually close and exercise the breaker.
  9. Verify phase rotation of the generator set matches the utility service.
  10. Check load carrying ability and transient performance; disconnect load.
  11. Verify all alarm and shutdown circuits; shut down the set.

Tools required

  • Two calibrated hand-held digital meters Amazon
  • Phase rotation meter Amazon
  • PowerCommand service tool kit Amazon

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Governor gain default value for paralleling applications: 70

Full service-parts list: Cummins/Onan DGBB →, Cummins/Onan DGBC →, Cummins/Onan DGCA →, Cummins/Onan DGCC →, Cummins/Onan DGDA →, Cummins/Onan DGDB →, Cummins/Onan DGEA →, Cummins/Onan DGFA →, Cummins/Onan DGFC →

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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