Kohler MPAC 1500 — Voltage, Frequency, and Phase Rotation Check Procedure
Testing & diagnosis · Source terminals
For the Kohler MPAC 1500, from the Kohler service manual.
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Before you start
- Hazardous voltage. Only authorized personnel should open the enclosure.
- Be prepared for the system to operate automatically.
Procedure
- Ensure that all downstream loads are switched off.
- If the source being measured is a generator set, start it by moving the master switch to RUN.
- Use a voltmeter to check the source phase-to-phase and phase-to-neutral terminal voltages and frequency.
- If Source N (utility) does not match the nameplate, STOP — the transfer switch is not designed for the application.
- If a generator set does not match the nameplate, adjust the generator set per the manufacturer's instructions.
- Use a phase rotation meter to check the phase rotation at the source terminals; rewire source terminals if necessary.
- Controller default phase rotation is ABC; change it to BAC in Source Setup if the application uses BAC.
- Stop the generator set (master switch to OFF/RESET) and repeat steps 2 through 5 for Source E.
- Close and lock the enclosure door, perform the Lamp Test, then proceed to the Automatic Operation Test.
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.