Hurco BMC20 Dynomotion Retrofit - Page 13


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Thread: Hurco BMC20 Dynomotion Retrofit

  1. #145
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Quote Originally Posted by mmurray70 View Post
    Sounds like a good plan. Figure out which wire is the manufactured leg and avoid using it, be sure to use the two hots from your single phase supply.

    Seems like your drives fried from over voltage, but i wonder if the phase converter could have been a factor too? I heard once that there can be some kind of an issue running vfds and servo drives from phase converter without a transformer in between. I didnt pay much attention to the issue because both my machines have built in transformers. Maybe someone else might have some more info on it.
    Yup, I know which is which. There is some "home built" converters that actually rob the leg being generated to run 3 phase motor which makes about like 40volts short. The converter i have is built and rated for CNC vfd duty, this is a 20hp from American Rotary. Its same converter i was running machine with before retrofit. The TECO VFD i put in machine with old control had no issues.
    We have 2 of these same converters at work running shop 1 is 20hp and 2nd is 30hp. Running new Milltronics machines and new Hurco mill around 15hp VFDs, 1.2 to 2KW AC Yaskawa servos each and have no problems. These converters actually hold a better voltage tolerance (around 5%) than grid 3 phase 10%.

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


  2. #146
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Ok. Got a new drive and connected to only R and S of Main Circuit. Both R and S are 120Vac single phase making 240VAC. And no SMOKE!! Done some successful jog tests of Y axis with DMM tuning software. So far iam estimating around 450IPM moves, am expecting more, but dont know enough about tunning these drives. Going to contact DMM with news and see if they have any configuring recommendations for drive and my machine setup.
    I also contacted them about testing new drive with 240VAC single phase only and they brought up my 3phase converter again. And said "Normally, you can just connect any two legs of a three phase output go get single phase." What?? Can someone tell me what iam missing? I have never used Delta Wye only Delta from a 3phase converter. Is Delta Wye able to do this?

    Anyhow will post as i get more results on testing all drives and servos.

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


  3. #147
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Good to hear you got it working. Are you using step and direction setup or 0-10v from Kanalog?

    Yes you can think of a 3 phase 240 supply as three separate single phase supplys that are 120 degrees apart in phase. So you can use any 2 wires of a 3 phase supply and have the same thing as normal single phase power. I mentioned this in post 142. It normally would not matter which two wires you picked and it might even be a good idea to use all three combinations between drives to keep things balanced. But considering your on a phase converter, i would just use the two mains and avoid the manufactured leg. No need of loading it down if you dont have too.



  4. #148
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Iam currently only testing with DMM tuning software. But when iam ready, will be using Kanalog 10v.

    But your voltage would be higher.

    Will be using converter for spindle VFD only now. And keep rest of machine on 240V single phase. This will allow me to run different attachments like high speed spindle without the need of running converter. Better on electric bill to.

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


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