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Phoenix Contact 24vdc 40A power supply repair

Discussion in 'Troubleshooting and Repair' started by bigone5500, Jan 23, 2016.

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  1. bigone5500

    bigone5500

    712
    121
    Apr 9, 2014
    I got a power supply from work out of the recycle bin. This is the one I have. I connected 110v to it and there is no voltage on the output side. I will take it apart and do some testing to see what I can find. I have taken it apart once but just to see if the fuse was good and it was. I think this unit retails for around $900 so I think it would be worthwhile to repair if possible. I did a quick look over and found that the small filter caps on the output are swelled. I am wondering if the transformer on that side is bad. The caps are 35v 1200uf and there are 4 of them. The large caps look to be ok. They are 420v 390uf.

    I am starting this thread for reference. I also would like input for what to look for and tips on troubleshooting these things. I do know that when working with this type of equipment that safety is paramount. Large caps can hold charge for a long time and are lethal.

    [​IMG]
     
  2. davenn

    davenn Moderator

    13,866
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    Sep 5, 2009
    highly unlikely that the transformer would have failed

    caps and semiconductors would be the first choices
     
  3. Minder

    Minder

    3,102
    664
    Apr 24, 2015
    That is a SMPS type, so I would check the large semi conductors for a start, replace any bad looking caps.
    The transformer is a switch mode type and a shorted turn is a possibility.
    M.
     
  4. bigone5500

    bigone5500

    712
    121
    Apr 9, 2014
    Took it apart and found another component that I think may be bad too. There is some smoke around it and the solder joint looks iffy too.
     

    Attached Files:

  5. davenn

    davenn Moderator

    13,866
    1,958
    Sep 5, 2009
    yeah seriously dry jointed and have been arcing
     
  6. bigone5500

    bigone5500

    712
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    Apr 9, 2014
    Last edited: Jan 26, 2016
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