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IndustryArena Forum > CNC Electronics > CNC Machine Related Electronics > Two different power supplies keep blowing fuses
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  1. #1
    Join Date
    May 2014
    Posts
    7

    Two different power supplies keep blowing fuses

    Hi,

    We have 2 x 36V 10Amp power supplies (not at the same time) to run 3 x Nema 23's.

    Untill recently they ran without issue, but a couple of days ago when one blew an internal fuse. We replaced, and again within minutes it blew.

    We then replaced it with the other power supply, which ran fine for a couple of days and now this one has blown a fuse too.

    We opened both of them up, and tested with new fuses and nothing else connected. Both blew, with sparks coming from the same component on both, the rectifier (D10XB60).


    Has anyone else had any issues like this before?
    Attached Thumbnails Attached Thumbnails EZBfyjy.jpg   lf8Uu7E.jpg  

  2. #2
    Join Date
    Jan 2005
    Posts
    15362

    Re: Two different power supplies keep blowing fuses

    JoeyJoe

    Depending on the quality of the power supplies, as to how long they last, with no protection, your back EMF is most likely what is causing the problem

    The link below will take care of your problem & protect the power supplies, you have to also make sure, your power supplies are balanced, meaning the output voltages have to be adjusted to be the same

    Power Supplies | Protoplant
    Mactec54

  3. #3
    Join Date
    Mar 2007
    Posts
    2083

    Re: Two different power supplies keep blowing fuses

    did you check the suppy was set correctly for your mains supply ?

    not all have a universal mains input (85V to 264V AC) like this one -
    http://docs-europe.electrocomponents...6b80ef23db.pdf

    one easy way to damage switch mode power supplies
    is to connect a 240V AC supply when the input voltage range switch set to 90-132V AC instead of 180-264V !
    this will result in the DC voltage of 680V DC instead of the normal 340V DC


    John

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