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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the operational environment for excessive electrical noise; consider adding shielding or optimizing cable routing to mitigate interference.

2. 4

   If using CC-Link IE Field Network Basic, verify the master's timeout period is configured correctly and ensure the cyclic transmission status bit for the inverter is ON.

3. 5

   For BACnet/IP, confirm that no other inverter's IP address conflicts with the Ethernet IP address range specified for command source selection.