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.

Complete Troubleshooting Guide

1. 1

   Securely connect the parameter unit cable to ensure a stable physical connection.

2. 2

   Check the communication data and communication settings on both the PU and the inverter for correctness.

3. 3

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