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Home›Repair guides›4. Use the PC Service tool or the Test sub-menu

Cummins/Onan OTPCA — 4. Use the PC Service tool or the Test sub-menu

For the Cummins/Onan OTPCA.

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Procedure

  1. 1. With the preferred source genset running and supplying power to the load, place the genset control Off–Manual–Auto selector switch in the Off position. The backup genset should start and run. After the voltage and frequency are at accept- able levels, the transfer switch should transfer the load to the backup genset.
  2. 2. Place the genset control Off–Manual–Auto se- lector switch on the preferred genset back in the Auto position. The preferred 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 preferred genset. After the transfer is complete, the control initi- ates a cool-down period (TDEC) on the backup genset and it should stop. Testing the System by Changing the Desig- nated Preferred Source:

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.