Kohler — Voltage Adjustment Procedure

Adjustments · ADC-RES controller

From a Kohler service manual covering: 12RES, 12TRES, 18RES, 18TRES, 8.5RES. Check it applies to your exact model before use.

Applies to: Kohler 12RES, Kohler 12TRES, Kohler 18RES, Kohler 18TRES, Kohler 8.5RES

Procedure

1. With the generator set off, connect a digital multimeter to the output leads or an outlet on the load side; set meter to AC voltage.
2. Start the generator set by moving the master switch to RUN.
3. Use the ADC controller to adjust the voltage (parameter 1P) until output voltage reaches the desired value.
4. Adjust the voltage stability (gain, parameter 2P) to minimize light flicker.
5. Readjust the voltage if necessary.
6. Set the multimeter to measure frequency.
7. Adjust engine speed to the cut-in frequency (57.5 Hz for 60 Hz units, 47.5 Hz for 50 Hz units) via engine governor speed (parameter 4P).
8. Adjust the volts/Hz (parameter 3P) until voltage begins to drop as load is applied at cut-in frequency.
9. Reset engine speed to operating frequency (50 or 60 Hz) via parameter 4P.
10. Readjust voltage stability (parameter 2P) if necessary.
11. Readjust voltage (parameter 1P) if necessary.
12. Save settings.
13. Stop the generator set.

Full service-parts list: Kohler 12RES →, Kohler 12TRES →, Kohler 18RES →, Kohler 18TRES →, Kohler 8.5RES →

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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