Current Offset Fault

What does CoF mean?

A Current Offset Fault occurs when the drive attempts to start operation while residual induced voltage is still present in the motor, such as after coasting to a stop or rapid deceleration. This indicates the current offset value has exceeded its permitted automatic adjustment range. In rare cases, this fault may also point to an internal hardware problem within the drive itself. Failure to resolve this can lead to incorrect motor control, erratic startup behavior, or potential damage if a hardware issue is present.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If the above steps do not resolve the fault and a drive hardware problem is suspected after initial troubleshooting, replace the drive. Perform a Fault Reset.