Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Kohler›Overvoltage Shutdown Adjustment (Decision-Maker 3+ Controller)

Kohler 2000ROZD — Overvoltage Shutdown Adjustment (Decision-Maker 3+ Controller)

Adjustments · Overvoltage potentiometer R41 or R42

For the Kohler 2000ROZD, from the Kohler operator's manual.

Applies to: Kohler 2000ROZD

Before you start

  • Do not use the safeguard circuit breaker in place of the line circuit breaker.
  • Do not contact electrical connections with tools or jewelry while making adjustments or repairs.

Procedure

  1. Disconnect the engine starting battery, negative (--) lead first. Disconnect power to the battery charger.
  2. With the generator set idle, open the output line circuit breaker to disconnect the load.
  3. Remove the controller cover.
  4. Wrap the shaft of an insulated-handle screwdriver with electrical tape. Turn potentiometer R41 or R42 fully clockwise.
  5. Connect a digital AC voltmeter to terminals V0 and V7 on the controller terminal block.
  6. Reconnect the battery, negative (--) lead last.
  7. Start the generator set by placing the master switch in the RUN position.
  8. Adjust output voltage to 115% of nominal (approximately 160 V across V0 and V7 for low wye/high wye; approximately 140 V for all other voltages).
  9. Slowly rotate R41 or R42 counterclockwise until red LED4 lights. The set should shut down on overvoltage in approximately 2 seconds.
  10. Turn the voltage adjustment potentiometer counterclockwise to reduce output voltage, restart, and slowly increase voltage to verify the shutdown setting.
  11. Reduce output voltage, restart, and readjust the generator set output to nominal voltage.
  12. Stop the generator set. Seal potentiometer R41 with RTV sealant or equivalent. Replace the controller cover.

Tools required

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

Specs & values

  • 115% of nominal output voltage
  • Approximately 160 V across V0 and V7 (low wye/high wye) or approximately 140 V (all other voltages)

Full service-parts list: Kohler 2000ROZD →

Source: Kohler operator's 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 →