Cummins/Onan ATUC A 800 - 4X / 111 — Start-Stop Time Delay Adjustment (Groups 11 Through 15)
Adjustments · Start-stop time delay module 7
For the Cummins/Onan ATUC A 800 - 4X / 111, from the Cummins/Onan service manual.
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Procedure
- Open the right cabinet door of automatic transfer switch.
- Move selector switch to WITH LOAD.
- Move test transfer switch to TEST.
- With a stopwatch, measure the time until the generator set starts cranking.
- Insert a small screwdriver through the START hole in module 7; turn clockwise to increase, counterclockwise to decrease.
- Move test transfer switch to NORMAL.
- Measure time until generator set begins to shut down.
- Turn STOP potentiometer clockwise to increase or counterclockwise to decrease the stop time delay.
- Repeat steps 2 through 8 until desired delay times are obtained.
- Move selector switch to WITHOUT LOAD or WITH LOAD.
- Close cabinet door.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Start delay factory adjusted for 2 to 3 seconds
- Stop delay factory adjusted for 4.5 to 5 minutes
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.