PU Disconnection / RS-485 Communication Fault

What does E.PUE mean?

The inverter output is shut off because communication between the inverter and the Parameter Unit (PU) has been suspended, or RS-485 communication errors exceeded the retry count or check time. This occurs when Pr.75 has PU disconnection detection enabled, or if Pr.121 or Pr.122 settings for RS-485 communication are exceeded. It indicates a loss of control or monitoring via the PU/RS-485 link.

Complete Troubleshooting Guide

1. 1

   Review and adjust the setting of Pr.75 Reset selection/disconnected PU detection/PU stop selection as necessary.

2. 2

   Ensure the PU cable is securely connected.

3. 3

   For RS-485 communication, check the settings of Pr.121 PU communication retry count and Pr.122 PU communication check time interval.