Common communication faults: no response of the communication or the VFD returns abnormal fault.

The possible reason for no response to the communication:

•     Selecting wrong serial interface, for example, if the converter is COM1, selecting COM2 during the communication

•     The baud rate, digital bit, end bit and check bit are not the same with that of the VFD.

•     + and - of RS485 bus are connected in reverse.

The 485 wire cap on the terminal board of the VFD is not plug in the wire cap in behind the terminal arrangement.