Kohler 12RES — Voltage Adjustment Procedure
Adjustments · ADC controller
For the Kohler 12RES, from the Kohler service manual.
Applies to: Kohler 12RES
Procedure
- Connect a digital multimeter to the output leads or an electrical outlet on the load side, set to AC voltage.
- Start the generator set by moving the master switch to the RUN position.
- Use the ADC controller to adjust the voltage (parameter 1P) until the output voltage reaches the desired value.
- Adjust the voltage stability (gain, parameter 2P) to minimize light flicker.
- Readjust the voltage, if necessary.
- Set the multimeter to measure frequency.
- Adjust the engine speed to the cut-in frequency by adjusting the engine governor speed (parameter 4P).
- Adjust the volts/Hz (parameter 3P) until the voltage level measured begins to drop.
- Reset the engine speed to the operating frequency (50 or 60 Hz) by adjusting the governor speed (parameter 4P).
- Readjust the voltage stability (gain, parameter 2P), if necessary.
- Readjust the voltage (parameter 1P), if necessary.
- Save settings.
- Stop the generator set.
Tools required
- digital multimeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 85-132 VAC: 5 VAC/step coarse, 0.5 VAC/step fine (parameter 1P)
- 180-251 VAC: 7 VAC/step coarse, 0.7 VAC/step fine (parameter 1P)
- Cut-in frequency: 57.5 Hz at 60 Hz, 47.5 Hz at 50 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.