Atlas Copco
Unstable Voltage Regulation
Generator output voltage fluctuates noticeably under steady load, lights flicker
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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
Failing AVR, Loose voltage sensing connections, Worn brushes/slip rings (if brush‑type alternator), Non‑linear loads causing distortion
How to Fix / Troubleshooting
Safety first: Voltage instability can damage sensitive equipment. Consider isolating critical loads until resolved.
- Check connections: Tighten all control and power connections in the alternator terminal box and control panel.
- Inspect AVR: Look for signs of overheating or damage. Ensure it is firmly mounted and grounded.
- Measure with meter: Use a true RMS meter to confirm fluctuations and rule out faulty panel meters.
- Replace AVR: If instability persists and other causes are ruled out, replace the AVR with the correct Atlas Copco‑specified unit.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Voltage Regulator (AVR)
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