Write disable error

What does Er1 mean?

This error occurs if a parameter setting was attempted while Pr.77 (Parameter write selection) disables write operations, if frequency jump ranges (Pr.31 to Pr.36) overlap, or if communication between the PU (Parameter Unit) and the inverter is abnormal. It indicates an issue preventing parameter modification or a communication problem.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the physical connection between the PU and the inverter for proper communication.