Parameter unit disconnection

What does E.PUE mean?

This function stops the inverter output if communication between the inverter and the Parameter Unit (PU) is suspended. This can occur if the operation panel or PU is disconnected when Pr. 75 is set to '2', '3', '16', or '17'. It also triggers if successive communication errors exceed the permissible retries when Pr. 121 is '9999' or if communication is broken for the time set in Pr. 122.