Kohler Series S340 — Voltage and Emergency Check
Testing & diagnosis · Automatic Transfer Switch
For the Kohler Series S340, from the Kohler service manual.
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Before you start
- Perform these checks in the order given, in order to avoid damaging the switch.
- Hazardous voltage can cause death or severe injury. The switch will now be energized. Proceed with care! Do not touch power terminals.
Procedure
- Check the nameplate for rated voltage; it should be the same as normal and emergency line voltages.
- Close the normal source circuit breaker; normal-source-available and load-connected-to-normal lamps should light.
- Use an accurate voltmeter to check for proper phase-to-phase and phase-to-neutral voltages at the Bypass Switch normal-source terminals.
- Close the emergency-source circuit breaker and manually start the generator set; the emergency-source-available lamp should light.
- Check for proper phase-to-phase and phase-to-neutral voltages at the Bypass Switch emergency-source terminals.
- Adjust the generator voltage regulator if necessary; the Automatic Transfer Switch only responds to rated voltage and frequency on the nameplate.
- Check phase rotation; it should be the same as that of the normal source.
- Shut down the generator set.
Tools required
- Accurate voltmeter Amazon
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.