Ethernet Communication Fault

What does E.EHR mean?

This fault indicates an interruption in Ethernet communication, often due to physical factors, when signal loss detection (Pr.1431 or Pr.1457 = '3') is enabled. The inverter output shuts off if communication is broken for the time set in Pr.1432. It can also occur in CC-Link IE Field Network Basic if data isn't received or the cyclic transmission status bit turns OFF, or in BACnet/IP if conflicting IP addresses are detected. A communication fault can stop critical processes and lead to loss of control over the inverter.

• Damaged Ethernet cable (e.g., broken conductors, bent RJ45 pins, improper shielding).
• Incorrect IP address (Pr.1401), subnet mask (Pr.1402), or gateway (Pr.1403) settings.
• Network switch or router failure preventing communication to/from the inverter.
• Loose connection at the inverter's RJ45 port or the network switch/PLC port.
• Communication signal loss detection parameter (Pr.1431 or Pr.1457 = '3') configured with an excessively short timeout.

Click steps to track your progress.

1. 1

   Inspect Ethernet cable for physical damage; replace with a known good CAT5e/CAT6 cable if suspect.

2. 2

   Verify IP address (Pr.1401), subnet mask (Pr.1402), and gateway (Pr.1403) settings are correct for the network configuration.

3. 3

   Ensure the Ethernet cable is securely connected to the inverter's RJ45 port and the network switch or PLC.

4. 4

   Ping the inverter's IP address from a connected device to confirm basic network connectivity.

5. 5

   Check communication loss detection parameters (Pr.1431 or Pr.1457) and their timeout settings (e.g., Pr.1432) for appropriate values.