Kohler Series S340 — Electrical Operation Test (Return to Service)
Testing & diagnosis · Automatic Transfer Switch
For the Kohler Series S340, from the Kohler service manual.
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Before you start
- Do not close the isolating contacts unless the Transfer Switch and Bypass Switch are in the same position (normal or emergency).
Procedure
- Operate and hold the door-mounted test switch until the generator set starts (should happen within 15 seconds).
- The Transfer Switch will operate to the emergency position; the load-connected-to-emergency lamp should come on.
- The Transfer Switch will operate back to normal after the return-to-normal time delay (up to 30 minutes).
- The time-delay-engine-cooldown will allow the generator set to run unloaded for several minutes before shutting down.
- Check the position of the Bypass Handle; it should indicate the source that is bypassed.
- Check which load-connected-to lamp is on; change the position of the Transfer Switch if it is not the same as the Bypass Switch.
- Close the isolating contacts: 150-400-Amp turn the Isolation Handle clockwise to CLOSE; 600-800-Amp push in and turn to CLOSED.
- Turn the Bypass Handle to the AUTO position.
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.