Error Code CoF

Current offset fault encountered during operation start-up or coast-to-stop periods.

? What Causes This

Start or restart sequence initiated when motor induced voltage remains after stopping event (e.g., coasting, fast deceleration), causing unbalanced current draw between phases.

✓ How to Fix It

Implement sequence preventing restarting before coast to stop completes. Enable speed search function prior to re-start; adjust acceleration parameters accordingly.

Source: page 120 of the official manual

From the manual

This error code appears in:

Yaskawa Hv600