Kohler — Voltage, Frequency, and Phase Rotation Measurement Procedure
Testing & diagnosis · Transfer switch sources
From a Kohler service manual — check it applies to your exact model before use.
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Before you start
- Perform voltage checks in the order given to avoid damaging the transfer switch.
- Only authorized personnel should open the enclosure.
Procedure
- Verify that the generator set master switch is in the OFF position and both power sources are disconnected.
- Disconnect the power switching device and controller wiring harnesses at the inline disconnect plug.
- Manually operate the transfer switch to position E.
- If Source N is a generator set, move the master switch to RUN; the generator set should start.
- Close the Source N circuit breaker and check phase-to-phase and phase-to-neutral voltages and frequency.
- Use a phase rotation meter to check phase rotation at the Source N terminals.
- If the source is a generator set, stop it by moving the master switch to OFF, then disconnect Source N.
- Manually operate the transfer switch to position N and repeat steps 4 through 8 for Source E.
- Disconnect both sources, reconnect the harnesses at the inline disconnect plug, and close the door.
- Reconnect both power sources and move the generator set master switch to the AUTO position.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.