Kohler MPAC 1200 / MPAC 1500 — Voltage, Frequency, and Phase Rotation Measurement Procedure
Testing & diagnosis · Transfer switch sources
For the Kohler MPAC 1200 / MPAC 1500, from the Kohler service manual.
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Before you start
- Perform voltage checks in the order given to avoid damaging the transfer switch.
- Do not connect or disconnect the controller wiring harness when power is connected.
Procedure
- Verify the generator set master switch is OFF 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, start the generator.
- Close the Source N circuit breaker or switch.
- Check Source N phase-to-phase and phase-to-neutral voltages and frequency.
- Use a phase rotation meter to check Source N phase rotation; rewire terminals if necessary.
- Stop the generator set and disconnect Source N.
- Manually operate the transfer switch to position N and repeat steps 4 through 8 for Source E.
- Disconnect both sources to the transfer switch.
- Connect the power switching device and controller wiring harnesses at the inline disconnect plug.
- Close and lock the transfer switch enclosure door.
- Reconnect both power sources.
- 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.