GS20 Fault E.OCA — Overcurrent During Acceleration
What This Fault Means
E.OCA means the output current exceeded the trip level specifically during motor acceleration. The high inrush required to accelerate the load tripped the drive's protection.
Common Causes
- Acceleration time too short (P01.12) for the load inertia
- Motor shaft mechanically locked or heavily loaded at startup
- Incorrect V/Hz boost setting (P01.07) causing excessive magnetizing current
- Drive undersized for the starting torque requirement
Recommended Fix
- Increase acceleration time (P01.12) — start by doubling the current setting.
- Check that the motor shaft rotates freely by hand.
- Reduce the torque boost (P01.07) if set above factory default.
- Verify drive rated current ≥ motor FLA × 1.1.
- For high-inertia loads, consider S-curve acceleration (P01.16/P01.17).
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