power supply failure

Discussion in 'General Electronics Chat' started by lokesh.dee, Jul 9, 2014.

  1. lokesh.dee

    Thread Starter New Member

    Jul 9, 2014
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    0
    Hai


    swicthing of input for a power supply cause failure?
    i have a failed 24V DC supply to analog instruments in one of our crystalyser panel input 230 V fed from a UPS. maximum current is 10A. make SOLA power supplies.

    This power supply failed after swicthing of the main power . we switched toff the panel for maintenanance after switching we observed that power supply output is not coming which was working fine before switching off the panel?

    we had same problem earlier for same capacity power supply in other panel. i suspected manufacturing deffect. these power supplies are 5 years old.
     
  2. debe

    Well-Known Member

    Sep 21, 2010
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    With out knowing what is in the circuit & 5 yrs old. Some SMPS have a resistor to kick start them & has probably gone high in value. Electrolytic caps may also be dried out.
     
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  3. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    My WAG is electrolytic cap(s).
    The timing is just about right.
     
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  4. lokesh.dee

    Thread Starter New Member

    Jul 9, 2014
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    thank you ..


    what would be the normal life time for a dc power supply. there are some level transmitter/pressure transmitters /ph transmitters connected to the power supply
     
  5. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    General rule of thumb is that electrolytic caps go bad anywhere from 3 to 8 years.

    I have a small pile of computer power supplies that gone bad after a few years. I am looking at bad electrolytic cap on lcd monitor power board that went bad after about 6 years.
     
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  6. wayneh

    Expert

    Sep 9, 2010
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    Oh c'mon. Most everything I own is older than that, and still working fine.
     
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  7. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Well, since my lcd monitor power board crapped out I am using Sony crt from the year of our lord 2002. There is hope for me yet.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,510
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    You could look at installing linear P.S.'s they are a bit more rugged and in the odd event of failure, are a lot easier to repair.
    24vdc regulated types are available if required.
    Max.
     
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