Kohler — Overvoltage Shutdown Check (Pot. 6)
Adjustments · Voltage Regulator Board
From a Kohler service manual covering: 10/15RMOY, 15/17.5ROY, 15RMY, 22.5-47.5ROZ, 22.5/32.5RZ. Check it applies to your exact model before use.
Applies to: Kohler 15RMY
Before you start
- Do not exceed 285 Volts when adjusting Pot. 2. Regulator board damage may result.
Procedure
- While observing AC voltmeter reading, slowly adjust Pot. 2 just to the point where the generator set shuts down. Note the reading just prior to shutdown.
- Reading shall be within: 50 Hz Sets 257 + 5 Volts AC; 60 Hz Sets 280 + 5 Volts AC.
- Readjust Pot. 2 about 1/8 turn in the CCW direction to prevent an immediate shutdown upon restart.
- Turn controller main switch to OFF position and reset the overvoltage fault.
- Restart the generator set.
- Adjust Pot. 2 while observing the AC voltmeter; adjust for a meter reading as specified for this set.
- If the set fails to pass this test, perform Overvoltage Shutdown Adjustment (Pot. 6).
Tools required
- AC voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 50 Hz Sets 257 + 5 Volts AC
- 60 Hz Sets 280 + 5 Volts AC
- 50 Hz Sets 257 + 3 Volts AC (adjustment)
- 60 Hz Sets 280 + 3 Volts AC (adjustment)
Full service-parts list: Kohler 15RMY →
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.