Kruger Ecowatt K320 Series Operation Manual page 308

Ecowatt Drive K320 series
®
9.5 Common communication faults
Common communication faults include the following:
No response is returned.

The VFD returns an exception response.

Possible causes of no response include the following:
The serial port is set incorrectly. For example, the converter uses the serial port COM1,

but COM2 is selected for the communication.
The settings of the baud rates, data bits, end bits, and check bits are inconsistent with

those set on the VFD.
The positive pole (+) and negative pole (-) of the RS485 bus are connected reversely.

The resistor connected to RS485 terminals on the terminal block of the VFD is set

incorrectly.
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Communication