PU Disconnection

What does PU disconnection mean?

A communication error has occurred between the PU (Parameter Unit) and the inverter, or the communication interval has exceeded the permissible time during RS-485 communication. This also triggers if the number of communication errors exceeds the retry limit. Loss of communication means the inverter cannot receive commands or send status, interrupting operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Increase the Pr. 122 PU communication check time interval setting, or set it to '9999' to disable the communication check function.