E028
Atlas Copco
Alternator Overtemperature Alarm
Atlas Copco controller indicates E028 Alternator Temperature High
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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
Blocked alternator ventilation, Overloading, High ambient temperature with inadequate cooling, Faulty temperature sensor in windings
How to Fix / Troubleshooting
Safety first: Ensure the generator is stopped and isolated before removing any covers around the alternator.
- Inspect ventilation: Check that alternator air inlets and outlets are free from dust buildup, plastic, or other obstructions.
- Review load profile: Confirm that the generator is not being run continuously above its rated kVA.
- Check ambient conditions: In very hot environments, ensure room ventilation fans and louvers are functioning correctly.
- Test temperature sensor: If the alternator is cool to the touch but the alarm is active, test or replace the embedded temperature sensor.
Do not ignore alternator overtemperature alarms; insulation damage can lead to costly failures.
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Repair Difficulty
Hard
4/5
Required Part
Alternator Temperature Sensor
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