Atlas Copco
ATS Fails to Transfer to Generator
Automatic Transfer Switch (ATS) does not transfer to generator during mains failure, 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
Faulty ATS control coil, Miswired ATS control signals from generator, Mechanical interlock jammed, Incorrect controller configuration
How to Fix / Troubleshooting
Safety first: ATS work involves live mains and generator circuits. Only qualified electricians should perform these tasks.
- Confirm generator ready signal: Check that the Atlas Copco controller is sending the correct dry contact or signal to the ATS when the generator is at rated voltage/frequency.
- Inspect ATS mechanism: With power isolated, manually operate the ATS to ensure it moves freely.
- Test control coil: Measure voltage at the ATS coil terminals during a transfer command. Replace the coil or contactor if it does not energize.
- Review wiring and logic: Compare ATS control wiring to the site schematic and correct any miswiring.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Contactor
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