Fieldbus/Serial Communication Lost

What does Com Error mean?

This fault indicates a loss of communication between the VSD and its control system via a serial or fieldbus network. This can be caused by cable issues, incorrect network settings, or a problem with the master controller. Loss of communication means the drive cannot receive commands or report its status, leading to uncontrolled operation or shutdown. It can halt processes relying on the drive's control.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure the master controller (PLC, HMI) is operational and actively communicating on the network.

2. 4

   Consult the specific Fieldbus option manual for advanced troubleshooting related to the network type in use.