PU disconnection

What does E.PUE mean?

This fault indicates a loss of communication between the inverter and the Parameter Unit (PU) or another device via RS-485. This can be due to a disconnected cable, incorrect communication settings (Pr. 75, Pr. 121, Pr. 122), or excessive consecutive communication errors. Loss of communication will stop inverter output, potentially halting the connected process.

• Physical disconnection of the RJ45 communication cable between the inverter's PU port and the external Parameter Unit.
• Incorrect RS-485 communication parameters configured in the inverter (e.g., Pr. 117, Pr. 118, Pr. 119) not matching the external device settings.
• Damaged or faulty RJ45 communication cable, leading to intermittent or complete signal loss.
• Termination resistor (if applicable) incorrectly set or missing on the RS-485 network causing signal reflection.
• Faulty Parameter Unit hardware or the inverter's communication port.

Click steps to track your progress.

1. 1

   Verify the RJ45 communication cable is securely connected to both the inverter's PU port and the external Parameter Unit.

2. 2

   Check inverter parameters Pr. 117 (Communication Speed), Pr. 118 (Communication Station Number), and Pr. 119 (Communication Data Length) against the Parameter Unit's settings.

3. 3

   Measure continuity and inspect the RJ45 communication cable for physical damage (frays, pinched sections) and replace if defects are found.

4. 4

   Test the system with a known-good Parameter Unit or try connecting to a different communication port if available on the inverter.

5. 5

   Confirm correct termination resistor settings (e.g., dip switch on inverter or external device) on the RS-485 network if multiple devices are connected.