Communication Error (PU Connector)

What does E.PUE mean?

This error code indicates a communication fault originating from the PU connector, specifically related to RS-485 communication. When the E.PUE fault occurs, the inverter's operation stops, and communication via the PU connector is interrupted. During this fault state, the inverter cannot be reset using a computer connected via the PU connector.

• Loss of communication signal on the RS-485 bus connected to the PU connector.
• Incorrect termination resistor configuration on the RS-485 network.
• Damaged PU connector pins or internal wiring.
• Electromagnetic interference disrupting the data transmission.
• Incorrect baud rate or data format settings for RS-485 communication.

Click steps to track your progress.

1. 1

   Verify RS-485 bus voltage levels at terminals A and B of the PU connector.

2. 2

   Inspect physical integrity of the PU connector and its mating half.

3. 3

   Confirm termination resistor values (typically 120 ohms) are correctly installed at network ends.

4. 4

   Cycle power to the affected unit after verifying connections.

5. 5

   Test communication with a known good PU unit if available.