Common Communication Faults - INVT Goodrive350-19 Series Operation Manual

Goodrive350-19 series VFD for crane
First, set the serial port to COM1. Then, set the baud rate consistently with P14.01. The data bits,
check bits, and end bits must be set consistently with P14.02. If the RTU mode is selected, you need
to select the hexadecimal form Input HEX. To set the software to automatically execute the CRC
function, you need to select ModbusRTU, select CRC16 (MODBU SRTU), and set the start byte to 1.
After the auto CRC check function is enabled, do not enter CRC information in commands. Otherwise,
command errors may occur due to repeated CRC check.
The commissioning command to set the VFD whose address is 03H to be forward running is as
follows:
03
VFD
address
Note:

Set the address (P14.00) of the VFD to 03.

Set "Channel of running commands" (P00.01) to "Communication", and set "Communication
channel of running commands" (P00.02) to the Modbus communication channel.

Click Send. If the line configuration and settings are correct, a response transmitted by the VFD
is received as follows:
03
VFD
address

10.4.9 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 485 terminals on the terminal block of the VFD is set incorrectly.
06 20 00
Parameter
Write
address
command
06 20 00
Parameter
Write
address
command
-426-
00 01 42 28
Forward running
00 01 42 28
Forward running
Communication protocol
CRC
CRC