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Controlling an ATV320 VSD over modbus rtu with a Schneider M221

4 posts in this topic

Hi there,

Im having issues controlling ATV 320 VSDs over Modbus RTU with a M221 plc, does anyone have any pointers for me to look at? I believe I Have set everything up correctly but when I run the program on the plc the atv's just stay in 'NST' state

I have included screenshots if they are any use

5c1024e61c476_Screenshot(1).thumb.png.535c102502a7017_Screenshot(2).thumb.png.da

 

My speed reference in this example is taken from the memory word %MW0 which I am inputting via a HMI

5c102504d0009_Screenshot(3).thumb.png.f4

 

I have addressed all my ATVs accordingly in there setting with the correct Modbus parameters and selected Modbus under the FR1 configuration, am I missing anything??

Any help is appreciated as I am really struggling

 

Tom

Screenshot (4).png

Screenshot (5).png

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It Is "State machine" and it is explained in manual on CD that came with VFD.

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As known to work on ATV 61/71

You have to sequence the command word [CMD] to start it. 

CMD = 6 then CMD = 7 lastly CMD = 15


 

 

-2018-dec-19-001.jpg

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18 hours ago, Goran Vuckovic said:

It Is "State machine" and it is explained in manual on CD that came with VFD.

Hi Goran,

Yeah I realise that the 'NST' is because its waiting for a command via Modbus, my issue is, I cant seem to communicate any commands over the Modbus system,

Im not sure at this moment whether my issue is a Hardware communication issue, a program issue or a setting I haven't made in the ATV320 drives themselves.

Cheers

Tom

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