Scheppach
Loss of Residual Magnetism / Alternator De‑Excited
Generator runs but produces no AC power, no error code shown
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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
Long storage without use, Shorted rotor field, Failed AVR, Loose excitation wiring
How to Fix / Troubleshooting
Safety first: Disconnect all loads and shut down the generator. High voltage is present when running; only qualified persons should perform live tests.
- Inspect AVR and wiring: With power OFF, check the AVR connections and alternator excitation leads for tightness and damage.
- Field flashing (advanced): Some alternators can be re‑magnetized by briefly applying a low DC voltage to the field winding. Follow the Scheppach service procedure exactly; incorrect flashing can damage the AVR.
- Check rotor continuity: Measure resistance of the rotor field winding via the slip rings. An open circuit indicates a failed rotor that must be replaced.
- Replace AVR: If rotor is good and wiring intact, install a new Scheppach AVR and retest output.
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Repair Difficulty
Professional Required
5/5
Required Part
Alternator Rotor
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