Transformer and Solenoid much too hot

Discussion in 'General Electronics Chat' started by Ken888, Apr 8, 2013.

  1. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    I have a 12v dc solenoid operating a open and close valve in a 15mm copper water pipe line. The plug in transformer is powered by the mains and puts out 12v dc 2A.
    They both run at a very high tempreture and I am concerned they may start a fire.
    Am I doing something wrong ?
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Maybe, what are the specs of that solenoid? It could be drawing more than the 2A the transformer can supply.
     
  3. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    This is the only info it had.
    Model:2W160-15
    Working Medium:Air,Water,Oil
    Operating Method:Direct action
    Type:Normal Closed
    Flow bore(mm):16
    Pipe Size:1/2"
    Liquid Viscosity <20CST
    Working Pressure Water,Oil:0~0.5Mpa Air:0~0.7Mpa
    Max Pressure:1.0Mpa
    Working Temperature: -5~85℃
    Voltage Range ±10%
     
  4. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    Do you think it's worth trying a 4A
     
  5. gerty

    AAC Fanatic!

    Aug 30, 2007
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    We need to know the voltage and current of the valves coil.
     
  6. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    It only gives AC 110V DC12V
     
  7. gerty

    AAC Fanatic!

    Aug 30, 2007
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    What I would do is connect a voltmeter to the wires going to the coil. Energize the coil and see what the voltage is. A low reading here~11volts or less usually means your power supply isn't adequate
    Another thing to do if your meter has a current mode is to see if you are drawing 2 amps or more.
     
  8. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    It drops to 11.56v
     
  9. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    and it draws 2.63 amps
     
  10. gerty

    AAC Fanatic!

    Aug 30, 2007
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    You need a power supply capable of at least 4 amps to run properly.
    I say 4 amps because 3 amps would be at nearly 100% capacity.
     
  11. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    Thanks alot gerty.
    You have realy been helpful.
    Solved in a couple of hours.
    Excellant.

    Regards
    Ken
     
  12. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    Thanks a lot for your help gerty.
    excellent.
    Ken
     
  13. gerty

    AAC Fanatic!

    Aug 30, 2007
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    You're welcome, glad it worked out
     
  14. Ken888

    Thread Starter New Member

    Apr 8, 2013
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    Just tried a 12v dc 4A transformer and the solidnoid still gets very hot.
     
  15. gerty

    AAC Fanatic!

    Aug 30, 2007
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    Sounds like you'll have to do the voltage/current test measurements again, Hopefully you haven't damaged the solenoid with the other transformer.
     
  16. vk6zgo

    Active Member

    Jul 21, 2012
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    Your Solenoid may have a mechanical fault which means the moving part needs more power to operate.
    More power,more current,more current,more loss in the coil resistance.

    How fast does the solenoid operate?
    If it takes a fairly long time,that is in itself indicative of a mechanical fault,unless its specification quotes that speed as acceptable.
     
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