Speedcommand Modbus driver for An Altivar ATV71 VFD

16 Mar 2017 11:41 #89737 by christian99x
We are using the following module for controlling our VFD:


The link to the git is down, but it's available on another forum:


The problem is, that the start/stop command works, but the speed command doesn't (We had this working, so I know it's possible). I found out, that there are two different addresses for these two commands, but I don't know where to set it. I searched the settings of the VFD, but I could not find this parameter.

Any help appreciated - Thanks !
16 Mar 2017 19:22 #89774 by andypugh
Have you looked at the component code?
17 Mar 2017 14:42 - 17 Mar 2017 14:46 #89825 by christian99x
Yes - in the xls file with the atv parameters I can find:

CMD 16#2199 = 8601 (speed)
16#2135 = 8501 (frequency)

....and in the code I can find:

#define REG_CMD 0x2135 // Control Word CMD 8501 frequency

So I would say it's correct ....... but it's not working....

Do I have to set the address in the atv or is it fixed??
Last Edit: 17 Mar 2017 14:46 by christian99x. Reason: correction
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