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Cummins/Onan OTPCA — Service Procedure

For the Cummins/Onan OTPCA.

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Procedure

  1. 1. Place the motor disconnect switch in the Off position, and both generator selector switches into the OFF position.
  2. 2. Place the transfer switch in the Source 1 posi- tion.
  3. 3. Place the Off–Manual–Auto selector switch on the Source 1 genset control in the Auto posi- tion. The genset will start and supply power to the load (the load will be energized and TDECa may be timing).
  4. 4. Use the PC Service tool or the Test sub-menu to set this genset as the preferred source.
  5. 5. Wait for TDECa to finish timing.
  6. 6. Place the Off–Manual–Auto selector switch on the backup genset (Source 2) control in the Auto position.
  7. 7. Place the motor disconnect switch in the Auto position.
  8. 8. If desired, use the Time Delay sub-menus un- der Setup or use the PC Service tool to enable the changeover timer and specify a change- over delay time period. Testing the System by Turning Off the 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.