AL16
SDMO
Generator Overload / Overcurrent Protection
Controller shows AL16 indicating overcurrent or overload; generator trips off load.
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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
Load exceeding SDMO generator rated kVA, Short circuit or ground fault on load side, Faulty circuit breaker or overcurrent relay, Incorrect current transformer (CT) wiring to controller
How to Fix / Troubleshooting
Safety first: Open the generator output breaker and isolate downstream circuits before investigating. Use appropriate PPE for fault-finding on power circuits.
- Check load level: Review recent load measurements on the SDMO controller. If load regularly exceeds 100% rating, reduce connected load or upgrade capacity.
- Inspect for short circuits: Check downstream distribution panels, cables, and loads for signs of damage, burning, or tripped breakers. Repair any faults before reconnecting.
- Verify CT wiring: In the SDMO control panel, confirm that current transformers are correctly wired (polarity and phase) to the controller. Incorrect wiring can cause false AL16 trips.
- Test main breaker: If the breaker trips at currents below rating, it may be defective. Replace with an SDMO-specified breaker of the correct rating and curve.
- Reset AL16: After resolving the cause, clear the alarm and re-energize loads gradually while monitoring current.
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Repair Difficulty
Hard
4/5
Required Part
Main Circuit Breaker
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