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Cummins/Onan OTPCA — Service Procedure

For the Cummins/Onan OTPCA.

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Procedure

  1. 1. Motor Disconnect Switch
  2. 2. Transfer Inhibit
  3. 3. Retransfer Inhibit
  4. 4. Load Shed Test/Exercise Active: The Test/Exercise Active in- dicator is lit when the ATS has a test or exercise in progress. Test: For utility-to-genset applications, the Test switch sends a start signal to the generator set des- ignated Source 2 and blinks the Test/Exercise Ac- tive indicator. After the start and transfer time de- lays, Source 2 starts and assumes the load pro- vided that the With Load option is selected. Press the Test switch again to end the test; the Test/Exer- cise Active indicator goes out and Source 1 re- sumes as the source of power. For genset-to-genset applications, there is no test function. Override: The Override switch terminates most system time delays. The Program Transition, Ele- vator signal and Engine Cool Down are not affected by this switch. If you press this switch while the Transfer Inhibit input is active, the switch immedi- ately transfers the load. If you press this switch while the Retransfer Inhibit input is active, the switch immediately retransfers the load. Reset/Lamp Test: The Reset/Lamp Test switch turns on all control panel indicators. This switch also acknowledges events (refer to the Events section). Security Key Switch Option The optional security key switch is located on the front panel between the handle and the Control Panel. When it is in the Panel Lock position, it dis- ables the front panel input switches, Test and Over- ride. It also prevents changes to the Digital Display from the setup menus; however, the current values are displayed. Changes can be made when the switch is in the Program position. Digital Display The Digital Display is standard on Level 2 controls and optional on Level 1 controls. It contains a 2-line by 20-character digital display module and 6 mo- mentary contact membrane switches. The module displays the menu system. The switches are used to navigate through the menu system. Each menu indicates the function of the four switches at the sides of the display module. Not all switches are active for each menu. See the Digital Display Menu System section for complete digital display menu details. 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.