Parameter Unit (PU) Disconnection

What does PU disconnection mean?

A communication error has occurred between the Parameter Unit (PU) and the inverter, or the communication interval has exceeded the permissible time during RS-485 communication. This prevents proper control, monitoring, and parameter adjustment of the inverter. Risk includes loss of operational control and inability to make necessary system adjustments.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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