AL16
FG Wilson
Overcurrent Protection Trip
Controller shows AL16 – Generator Overcurrent / Overload
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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
Total load exceeding generator rating, Short circuit or fault in load circuits, Incorrect current transformer (CT) calibration, Stuck contactor in ATS causing backfeed
How to Fix / Troubleshooting
Safety first: Open the generator output breaker and ensure the ATS is in a safe position. Do not repeatedly reset breakers without finding the cause.
- Check load level: Review the kW and kVA readings on the controller. Compare with the FG Wilson generator nameplate rating. If consistently above rating, reduce connected load.
- Inspect for downstream faults: Check for tripped breakers or blown fuses in the load distribution panels, which may indicate a short circuit.
- Verify CT wiring: In the control panel, ensure CTs are correctly oriented and wired to the controller. Incorrect polarity can cause false overcurrent readings.
- Test with reduced load: Start the generator with minimal load and gradually add circuits while monitoring current. Identify any circuit that causes a sudden current spike.
- Correct wiring or faulty loads: Repair or isolate faulty load circuits before returning the generator to normal service.
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Repair Difficulty
Hard
4/5
Required Part
Current Transformers (CTs)
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