Dyna DM4400 Retrofit

Results 1 to 8 of 8

Thread: Dyna DM4400 Retrofit

  1. #1
    Registered Fredrik88's Avatar
    Join Date
    Sep 2018
    Posts
    4
    Downloads
    0
    Uploads
    0

    Post Dyna DM4400 Retrofit

    I am doing a retrofit on a Dynamyte DM4400.

    I am going with Centroid Acorn for the moment and have the drives and new steppermotors all wired in and ready.

    But i am having questions regarding the spindel. And my plan is to use a VFD. The problem is i can only find VFD´s with the output of 220v.
    And the spindelmotor is rated to 180v. Do anybody have a suggestion on where i can find a VFD that works with this spindelmotor?

    Similar Threads:


  2. #2
    Registered Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    2980
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    Many VFDs have an setable maximum output voltage.

    Jim Dawson
    Sandy, Oregon, USA


  3. #3
    Registered Fredrik88's Avatar
    Join Date
    Sep 2018
    Posts
    4
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    Ok, Thanx for quick answer.

    Im looking at something like this. But this one and many others say that they are in the range of 204-240volt.

    https://www.ebay.com/itm/7-5KW-VFD-1...gAAOSwJkJWlLX2



  4. #4
    Registered Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    2980
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    The voltage they are talking about in the ad is the maximum output voltage, based on the input voltage. The settable output voltage is different, but you would have to have the manual to be able to determine what the setable output range actually is. My VFD has a minimum possible setting of 200V, which by good luck is my 7.5 KW spindle motor nameplate voltage.

    Could you run a 180V motor at 200V? I suspect it would work fine, that's +10%, close enough I think. But look at the nameplate amps on the motor and make sure the VFD is rated at least the nameplate current.

    What kind of machine spindle would this be running? Lathe, Mill, Router?

    Jim Dawson
    Sandy, Oregon, USA


  5. #5
    Registered Fredrik88's Avatar
    Join Date
    Sep 2018
    Posts
    4
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    I have added a picture of the nameplate of the motor.

    The motor is on a mill.

    Attached Thumbnails Attached Thumbnails Dyna DM4400 Retrofit-46987334_10155826491587026_5105244667738324992_n-jpg  


  6. #6
    Registered Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    2980
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    That is a DC motor, you are not going to be able to run it on a VFD

    Jim Dawson
    Sandy, Oregon, USA


  7. #7
    Registered Fredrik88's Avatar
    Join Date
    Sep 2018
    Posts
    4
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    Dang, Thant no good. What are my options?



  8. #8
    Registered Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    2980
    Downloads
    0
    Uploads
    0

    Default Re: Dyna DM4400 Retrofit

    Maybe you can interface the Acorn with the existing spindle drive. The existing drive should take the same inputs as a VFD, so if the Acorn can run a VFD, then it should run the existing drive. If you have a electrical diagram of the original panel it might not be too hard to sort out.

    Failing that, I see a new spindle motor and VFD in your future. You linked to a 7.5KW VFD above, is your spindle actually 7.5KW?

    Jim Dawson
    Sandy, Oregon, USA


Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Dyna DM4400 Retrofit

Dyna DM4400 Retrofit