Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Service Procedure

Cummins/Onan OTPCA — Service Procedure

For the Cummins/Onan OTPCA.

Browse Cummins/Onan generators & specs →

Procedure

  1. 1. With the preferred source genset running and supplying power to the load, use the PC Ser- vice tool or the Test sub-menu to change the preferred source. The new preferred source should start and run. After the voltage and frequency are at accept- able levels, the transfer switch should transfer the load to the new preferred source. After the transfer is complete, the control initi- ates a cool-down period (TDEC) on the old pre- ferred source and it should stop.
  2. 2. Use the PC Service tool or the Test sub-menu to change the preferred source back to the orig- inal genset. The original genset should start and run. After the voltage and frequency levels are at acceptable levels, the transfer switch should transfer the load back to the original genset. After the transfer is complete, the control initi- ates a cool-down period (TDEC) on the backup genset and it should stop. Dual Stand-By Operation In dual stand-by applications, utility power is avail- able. The system

Source: manual:962-0516A Onan OTPC (40-1000 Amp) Transfer Switch Service manual (10-2002).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.