Kohler 12RES — Frequency Adjustment Procedure
Adjustments · ADC controller / engine governor
For the Kohler 12RES, from the Kohler service manual.
Applies to: Kohler 12RES
Procedure
- Attach a frequency meter to the AC output leads or an electrical outlet on the load side.
- Start and run the generator set until it reaches normal operating temperature (at least 10 minutes).
- Adjust the electronic governor speed (parameter 4P) to obtain a frequency reading of 60 Hz (or 50 Hz).
- Check stability with the generator set running and no load applied; adjust governor stability (gain, parameter 5P) if unstable.
- Check the frequency reading and repeat prior steps if necessary.
- Save settings.
Tools required
- frequency meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 60 Hz units operate at 3600 rpm; 50 Hz units run at 3000 rpm
- Each step changes engine speed about 3.6 rpm, changing output frequency about 0.06 Hz
Full service-parts list: Kohler 12RES →
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.