AC relay control

Discussion in 'General Electronics Chat' started by nelsoncost, Jan 14, 2010.

  1. nelsoncost

    Thread Starter New Member

    Jan 14, 2010
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    Hi
    I bought a 220V AC relay.
    When I connect it to AC it keeps opening and closing (at a rate of 50 cycles per second, I guess).
    Shouldn´t it just close or open once? How can i force it to do it?
     
    Last edited: Jan 14, 2010
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    What is the make and model of the relay? How have you connected it?
     
  3. nelsoncost

    Thread Starter New Member

    Jan 14, 2010
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    Its a relay FINDER 4052 2 INVERTER 220VAC. For now, and only for testing, I am plugging the terminals of the coil directly to 220 VAC.

    I have also already tried to insert a diode in series with the coil but the relay keeps switching uninterruptibly.
     
    Last edited: Jan 14, 2010
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Searching the number indicates that a model 4052 should have the designation of "8230" following the model number to have a 230 VAC coil.
     
  5. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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  6. nelsoncost

    Thread Starter New Member

    Jan 14, 2010
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    That is the relay I have.... and my question remains: When I connect it to 220V AC shouldn´t it change from open to close only once?
     
  7. nelsoncost

    Thread Starter New Member

    Jan 14, 2010
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    Thank you very much for your answer... But the 40.52.8230 should be monoestable....
     
    Last edited: Jan 14, 2010
  8. zgozvrm

    Member

    Oct 24, 2009
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    Are you sure the relay is not rated for 220 volts DC ?
     
  9. zgozvrm

    Member

    Oct 24, 2009
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    There is the possibility that the relay was mis-marked and/or mis-packaged...
     
  10. nelsoncost

    Thread Starter New Member

    Jan 14, 2010
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    I am starting to be believe in that.... I will try to get a new one from another place
     
  11. BillB3857

    Senior Member

    Feb 28, 2009
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    How many terminals for the coil? We used a latching relay that actually had a permanent magnet as the hold element. Three terminals for coil. One terminal was common, one terminal for latch, one for unlatch. Internally, there were two diodes. One polarity aided the magnet to pick up the armature. Opposite opposed the magnet to drop out the armature. Connecting both, it would buzzzzz at line frequency.
     
  12. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    If it is an AC relay you might see a copper shading ring around part of the core.
     
  13. k7elp60

    Senior Member

    Nov 4, 2008
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    Ac coils for relays and soleniods have a shader ring(usually made of copper)on the top of the core. Because of the shader ring, the magnetism developed in part of the core lags somwhat the magnetism of the remainder of the core. That is, there is a slight phase displacement between the magnetism of the part of the core and the remainder of the core. Thus, as the unshaded-core magnetic energy decrease to zero every half-cycle, the magnetic energy still present in the shaded portion of the core holds the armature sealed. By the time the energy in the shaded portion decrease to zero, coil and unshaded-core magnetic energy have begun to increase once again as current increase in value.
     
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