Atlas Copco
Auto Start Function Failure
Generator does not start automatically on mains failure, but starts manually from controller
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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
Controller in manual/off mode, Incorrect auto start configuration, Faulty mains failure signal, Inhibited by active alarm
How to Fix / Troubleshooting
Safety first: Simulate mains failure only under controlled conditions and with load supervision.
- Check controller mode: Ensure the Atlas Copco controller is set to AUTO and not MANUAL or OFF.
- Review active alarms: Clear any latched alarms that may inhibit auto start.
- Test mains sensing: Verify that the controller detects loss of mains (voltage drops to zero on sensing inputs) when the mains breaker is opened.
- Check auto start settings: In the configuration menu, confirm that auto start on mains failure is enabled and delays are set correctly.
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Repair Difficulty
Medium
3/5
Required Part
Controller Configuration (Software)
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