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Cummins/Onan OTPCA — 11. If desired, use the PC Service tool to enable the

For the Cummins/Onan OTPCA.

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Procedure

  1. 1. With the utility supplying power to the load and neither genset running, turn off the utility circuit breaker feeding the load transfer switch. The preferred genset should start and run. After the voltage and frequency are at accept- able levels, the lead transfer switch should transfer the load to the preferred genset.
  2. 2. Place the Off–Manual–Auto selector of the pre- ferred genset (running) control in the Off posi- tion. The preferred genset should stop and the backup genset should start and run. After the voltage and frequency are at accept- able levels, the genset-to-genset transfer switch should transfer the load to the backup genset.
  3. 3. Place the Off–Manual–Auto selector switch on the preferred genset back to the Auto position. The preferred genset should start and run. After the voltage and frequency are at accept- able levels, the genset-to-genset transfer switch should transfer the load to the preferred genset. The backup genset should stop after the time delay engine cool-down (TDECa) is completed. CONTROL LEVELS 1 AND 2 Two controls are available. The type of power source switched and the desired features deter- mine the control levels available. See the Descrip- tion section for details. The table lists the applica- tions that are available with each control. TABLE 1-1. AVAILABLE CONTROL LEVELS Power Sources Level 1 Level 2 Genset-to-Utility X X Genset-to-Genset X Utility-to-Utility X Redistribution or publication of this document, by any means, is strictly prohibited.

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.