Hurco BMC20 Dynomotion Retrofit - Page 5


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Thread: Hurco BMC20 Dynomotion Retrofit

  1. #49
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Russ,
    Any idea how well the RS485 works when a potentiometer is used to override a commanded speed? The pot would be wired to a Kanalog analog input.

    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Troy,
    That should not be an issue at all. You will need to add some code in one of your threads, but I used modbus in Mach3 for my spindle and had a pendant with the override pot and it worked perfect. My pendant for my kmotioncnc machine does not have the spindle or feedrate override pots and I really miss that feature for my bigger machine. I guess I will need to buy a new pendant or add pots to my existing pendant. Modbus sends the commands to the VFD and the override pot would just send another Modbus command to the VFD. You can probably find someone who has already implemented this and has there C code available.
    Russ



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Tom or anyone,
    Would there need to be a converter to use the JP10 RS232 on the Kanalog with the RS485 on VFD?

    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Troy,
    You will most likely need to get a USB-to-RS485 converter. This will be viewed as a standard serial port in Windows. I would think you can use the converter on the PC USB port, not certain how KmotionCNC would access a standard PC port, but I am certain they can do that.
    Russ



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Unless iam misunderstanding something, the JP10 connector on Kanalog board will transmit the data like RS485, i just think Rs232 and RS485 are different voltages?
    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Troy,
    RS232 uses +/- 12V in its standard configuration. The RS485 is closer to 5V but is a differential signal carried on two wires with a common ground. If you used the built in RS232 on the KANALOG you will need to wire that to a RS232-to-RS485 converter. They sell them on ebay as I recall. If the ground on the VFD is tied to the Ground on the KANALOG then you only need two wires from the RS485 converter to the VFD.

    RS232 to RS485 RS422 Serial Adapter Converter 9 Pin Interface Data Communication | eBay

    Russ



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Ok. You jogged my memory. I remember going down this road on another mill i had that used a VFD from Automation Direct and RS485. I have a ebay convertor somewhere as i never used it. If i go this route i will get a better converter.

    http://www.homecncstuff.elementfx.com/


  8. #56
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Your panel is looking good



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Jim,
    Thanks. Good to here that from a "veteran" at controls. Lets me know that its the right direction. This is the most detailed and option oriented electrical enclosure i have done.
    Thanks again,
    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Troy,
    I like the layout of your control panel, and I especially like the fact you used several EMI filters you are doing all the right stuff. Doing all this stuff up front will help you avoid so many headaches down the road. Good Job.

    Russ



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Thanks, Trying to be as text book as i can. And get a better understanding of how things work.

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Has anyone used this pendant before?
    Future life Tech iHDW-FPGDL-IM

    http://www.homecncstuff.elementfx.com/


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