MTU Onsite Energy ATS Fails to Transfer on Generator Available

Automatic transfer switch does not transfer to generator during utility outage, but generator runs

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Incorrect generator start/stop wiring to ATS, ATS control power issue, Generator voltage/frequency outside ATS acceptance window, Faulty ATS controller

How to Fix / Troubleshooting

Safety first: Work on ATS only with all sources isolated and locked out. Only qualified personnel should service transfer switches.

  • Verify generator output: Confirm that generator voltage and frequency are within the ATS’s programmed acceptance range.
  • Check start/stop and available signals: Verify wiring between the MTU controller and ATS for generator available and start signals.
  • ATS control power: Ensure the ATS controller has proper control power from its designated source.
  • Simulate signals: If safe, simulate a generator available signal to see if the ATS responds. If not, the ATS controller or mechanism may be faulty.
  • Coordination review: Review ATS and generator controller settings to ensure compatibility. Adjust as needed per manufacturer guidelines.
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Repair Difficulty

Professional Required 5/5

Required Part

Automatic Transfer Switch Controller
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