Kohler MPAC 1200 / MPAC 1500 — Controller Replacement Procedure

Repair & overhaul

For the Kohler MPAC 1200 / MPAC 1500, from the Kohler service manual.

Browse Kohler generators & specs →

Procedure

1. Move the generator set master switch to OFF; disconnect the engine starting battery, negative lead first.
2. Disconnect power to the transfer switch; open the enclosure and check the voltage at the source lugs.
3. Disconnect the transfer switch harness at the P1 connector at the bottom of the controller.
4. Disconnect the programmed-transition board at connector P2, if equipped.
5. Disconnect the controller ground wire at the ring terminal on the enclosure door.
6. Disconnect the accessory module assembly at connector P16, if connected.
7. Remove the plastic cover from the old controller and save it (includes the nameplate).
8. Label and disconnect any input/output leads at TB1 and the RS-485 cable at TB2.
9. Disconnect other communications connections and the current sensing accessory at P3.
10. Support the controller assembly and remove the four nuts at the corners.
11. Remove the entire controller assembly.
12. Install the new controller; secure the four nuts and tighten to no more than 6.8 Nm (5 ft. lbs.).
13. Reconnect the ground wire, P2, TB1, TB2, P16, and the transfer switch harness.
14. Set up the new controller using the saved settings file or the user interface/SiteTech.
15. Reconnect the battery, move the master switch to AUTO, and run a loaded test.

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.

More Kohler repair guides →