Modbus control of Hitachi VFDs

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from the Ack! Please Help department...

Modbus control of Hitachi VFDs

Posted by Zorlack on 8 May, 2008 - 1:09 am

I've hit a bit of a stumbling point in my first experiments in motion control.

My Setup:
I have a Hitachi VFD connected to my PC via Hitachi's "ConverterCable" (this is just a RS-232 <> RS-422 converter).

My Goal:
I'd like to use an existing Modbus implementation (probably NModbus or jamod) to send Start/Stop/FW/RW commands to the VFD.

Right now I'm able to control the VFD using Hitachi's ProDrive software, which I believe uses Modbus. My problem is that I don't really know what registers I should be reading-from and writing-to in order to get control. Does anyone have any insight as to where I can get this information?

I really appreciate any advice anyone can give me in getting closer to my "Goal".

Thanks!

-Zorlack

Reply to this post...

Posted by Curt Wuollet on 8 May, 2008 - 11:14 pm

Get a datascope.

Regards

cww

Reply to this post...

Posted by Marc Sinclair on 9 May, 2008 - 10:29 pm

Hi,

Ask Hitachi, they built it! If they don't publish the protocol, then ditch their drives and choose another manufacturer that does. Try Danfoss or Siemens, I know their Protocols are available.

Marc Sinclair

Reply to this post...

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