Auto-Tuning Fault

What does -tnF mean?

This fault occurs during the auto-tuning process, indicating that the drive controller is unable to successfully tune itself to the connected motor. This is typically due to using a specialized motor or one whose power rating does not match the 'n' (nominal) or 'nld' (no-load) settings of the UFb parameter, preventing optimal motor control. Incorrect tuning can lead to inefficient operation or other motor control issues.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If using a special motor (e.g., synchronous, reluctance), consult the motor and drive manuals for specific tuning procedures or compatibility, or consider if auto-tuning is appropriate for this motor type.