E18
Scheppach
Phase Current Imbalance
E18 phase imbalance alarm, generator continues running but warns of uneven 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
Uneven distribution of single‑phase loads on three‑phase generator, Loose connection on one phase, Faulty current transformer (CT) on affected phase
How to Fix / Troubleshooting
Safety first: Disconnect non‑critical loads and use proper PPE when working in electrical panels.
- Check load distribution: Review which circuits are on each phase of the Scheppach three‑phase generator. Move large single‑phase loads to balance currents across L1, L2, and L3.
- Inspect phase connections: At the generator output lugs and ATS, tighten all phase and neutral connections. Look for discoloration or melted insulation indicating overheating.
- Verify CT wiring: Locate the current transformers feeding the controller. Ensure each CT is clamped around the correct phase conductor and that its wiring is intact and correctly landed on the controller terminals.
- Monitor currents: Use a clamp meter to measure current on each phase under typical load. If one phase reads zero or erratic while the others are normal, suspect a faulty CT or open conductor.
- Replace CT if necessary: Install a new Scheppach‑specified CT on the affected phase and recalibrate the controller if required.
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Repair Difficulty
Hard
4/5
Required Part
Current Transformer (CT)
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