[bouni]

Hi,

I'm trying to implement Modbus support for my Huanyang VFD (HY02D223B) into Smoothieboard which works nearly as expected :-)
I can send the run command as well as the stop command but if i send the command for a speed change nothing happens!?

I changed these parameters:

• PD001: 2 (Source of run commands: communication port)
• PD002: 2 (Source of operating frequency: communication port)
• PD163: 1 (Communication address: 1)
• PD164: 1 (Communication Baud Rate: 9600)
• PD165: 3 (Communication Data Method: 8N1 RTU)

I send these commands (crc is calculated by a function):
Start: 0x01 0x03 0x01 0x01 CRC CRC - works fine
Stop: 0x01 0x03 0x01 0x08 CRC CRC - works fine

I tried several commands for the speed but i cannot find a working variant:

0x01 0x02 0x03 0x03 0x0B 0xB8 - no success
0x01 0x05 0x02 0x0B 0xB8 - no success

Can anybody tell me what a proper speed command has to look like?

Thank you for any kind of help

[Al_The_Man]

The format in order is
01 = address
05 = send freq
02 = data length
xx = Hi byte
xx = Lo byte
xx xx = check sum.

e.g. set 1760
01 05 03 06 E0 (CS)
06e0 = 1760 dec

VFD replies with same data.

FUNCTIONS:
READ DATA 01
WRITE DATA 02
WRITE CNTL 03
READ STATUS 04
WRITE FREQ 05

Not really standard Modbus.

Al.

[bouni]

Hi Al_The_Man,

i will try the sequence you've suggested!

Thank you for your answer