burnt contactor coils in an ATS panel

Discussion in 'General Electronics Chat' started by ibegbu_e, May 12, 2011.

  1. ibegbu_e

    Thread Starter New Member

    Nov 8, 2009
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    0
    Can any one help please. On of the contactor coils in my ATS panel kept burning after replacing it. The ATS controls two generator and mains power. The contactor that controls the mains power kept burning(melting the insulation) The coil is a 220-240v coil. (supply is also 220v) A Lovato product. I have checked the circuit and connections but see nothing wrong.

    This is the third time I am replacing this coil. Can anybody help here please
     
  2. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    How quick does it go? Post a two line drawing.
     
  3. ibegbu_e

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    It can stay for up to two or three weeks before going bad. But there is a lot of power cut so average working time can be put to 7 hours a day. what do you mean by two line drawing. Thanks for replying
     
  4. ibegbu_e

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    There is something else i did to check where the problem is coming from. I replaced the coil with a 110volt coil and connected a step down transformer(220volts to 110volt) before the coil but the transformer got fried after some days
     
  5. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
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    Two line drawing is a schematic showing both supply lines.

    bet you didn't fuse the transformer?
     
  6. ibegbu_e

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    See the attached. hope this is ok, The transformer is connected to a breaker
     
    • Ats.pdf
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  7. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
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    Don't see a transformer, contact coil, or controls to operate coil. voltages need to be marked along with cb/fuses, etc,etc.

    A meaningful answer can only come from meaningful information.
     
  8. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    Low voltage can burn a contactor coil pretty quickly. If you are seeing a lot of power (line) drops, is the voltage at the proper value when it returns or does it come on at a low voltage and creep up to normal value?
     
  9. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,795
    949
    Start up and shut down surge currents can and do exceed the average name plate ratings of the equipment.



    Perhaps using a contactor with a HIGHER rating(at least 2x the rating; if 15amp, then use 30 amp contactors) is all you need to do.
     
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