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IndustryArena Forum > CNC Electronics > CNC Machine Related Electronics > How can I use positive ground or (-48VDC) Power Supply.
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  1. #1
    Join Date
    Sep 2019
    Posts
    2

    Question How can I use positive ground or (-48VDC) Power Supply.

    Hello Dears.

    I have started my new CNC build project and I want to utilize telecommunication standard PSU, which is providing "-48VDC" or actually positive grounded.
    All CNC electronics is negative grounded. I want to mount all enclosures (PSU and Drivers enclosure..) in to the same rack (preferably).
    Does anyone has experience with such combination?

    Maybe something around polarity inversion or isolated DC/DC convertors?

    thanks
    Alex

  2. #2
    Join Date
    Aug 2009
    Posts
    230

    Re: How can I use positive ground or (-48VDC) Power Supply.

    And that -48v is in relation to the frame ground of the power supply, right?

    If yes; then you are going to spend as much on a dc-dc converter as you would just getting a power supply that put out the correct voltage in the first place. Also, dc-dc converters aren't 100% efficient; you will loose some power in the process. So, I wouldn't try to do this. Switching power supply's aren't that expensive these days; even good ones.

    If no (and considering the way you asked the question, unlikely - you probably already checked this); and it's not referenced to the frame ground of the power supply then just attach the negative lead of it's output to the frame and use the positive lead as your power connection.


  3. #3
    Join Date
    Sep 2019
    Posts
    2

    Re: How can I use positive ground or (-48VDC) Power Supply.

    thanks for reply __Britt.
    Yes it is in relation to the power supply frame, "plus" output of PSU is connected to the PSU frame(body) and -48 is in reference to it.
    Seems I'm going to buy new supply ...sad, this is really good one

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