ABB ACS880 Fault 3220 — Earth Fault

What This Fault Means

Fault 3220 means the drive detected leakage current to ground on the output phase. This is a safety-critical fault protecting against insulation breakdown.

Common Causes

• Motor cable insulation damage (abrasion, rodent damage, heat)
• Motor winding insulation breakdown
• Moisture ingress into the motor or junction box
• Long cable runs causing capacitive leakage exceeding detection threshold

Recommended Fix

1. Disconnect motor cables from the drive and megger each phase to ground.
2. If using long cables (>100m), check if the earth fault detection level (parameter 30.10) needs adjustment.
3. Inspect motor junction box for moisture — dry and re-seal if wet.
4. Test cable insulation separately from the motor by disconnecting at the motor terminal box.
5. Replace any cable section that tests below 1 MΩ.