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Kohler MPAC 1500 — Controller Replacement Procedure

Repair & overhaul · MPAC 1500 ATS controller

For the Kohler MPAC 1500, from the Kohler service manual.

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Before you start

  • Hazardous voltage. Disconnect all power sources before opening the enclosure.
  • Only authorized personnel should open the enclosure.

Procedure

  1. Move the generator set master switch to OFF and disconnect the engine starting battery, negative lead first.
  2. Disconnect power to the transfer switch by opening switches or circuit breakers; open the enclosure and verify the source lugs are de-energized.
  3. Disconnect the transfer switch harness at P1, the programmed-transition board at P2, the ground wire, the accessory module at P16, and input/output, RS-485, Ethernet, USB, and current sensing connecti
  4. Remove the plastic cover (which includes the nameplate) and save it for installation on the new controller.
  5. To replace the entire assembly: remove the four corner nuts, install the new assembly, and tighten the nuts to no more than 6.8 Nm (5 ft. lb. or 60 in. lb.).
  6. To replace the logic circuit board: disconnect the ribbon cables, remove four mounting screws, install the new board, and reconnect the cables.
  7. To replace the power board: disconnect the ribbon cable, remove the mounting screws, install the new board with its insulating cover, and reconnect the cable.
  8. Reconnect the ground wire, the PTB at P2, I/O leads at TB1, RS-485 at TB2, the accessory module at P16, and the transfer switch harness.
  9. Check and adjust the DIP switch settings, close and lock the enclosure door, and reconnect power to the transfer switch.
  10. Load the saved configuration (.cfg) file or use the user interface to set system voltage, frequency, phases, phase rotation, and time delays.
  11. Program input 1 on the main logic board to Inhibit Transfer.
  12. Reconnect the engine starting battery (negative lead last) and move the master switch to the AUTO position.
  13. Press the down arrow button and then the LAMP TEST button to verify that all LEDs light.
  14. Run a loaded test to check system operation (Section 3.6).

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Controller mounting nuts: no more than 6.8 Nm (5 ft. lb. or 60 in. lb.)

Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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