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Solid State Relay Differences?

Discussion in 'Electronic Repair' started by [email protected], Aug 26, 2005.

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  1. Guest

    The project I am working on will need a relay for a 1/3 to 1/2 hp 240V
    pump motor.

    Have been trying to do my homework concerning possible solid state
    relays to use.

    So far the Teledyne S24A25 (zero crossing turn on) and the Crydom
    A2425-10 (random turn on) seem quite similar except for the difference
    in turn on.

    Am wondering how much difference this actually makes?

    Welcome any suggestions for these or other suitable solid state relays.

    Thanks

    Ken
     
  2. GregS

    GregS Guest

    I was trying too use some zero crosing models for controlling a solenoid.
    It became unstable at times with the inductance, and randomly pulsed
    when it was not supposed to. I would recommend the standard type.

    greg
     
  3. Michael Gray

    Michael Gray Guest

    The principal difference is the amount of RF noise that is generated.
     
  4. James Sweet

    James Sweet Guest

    And for an inductive load like a motor it's a particularly good idea to use
    one with zero crossing.
     
  5. kip

    kip Guest

    Use the Zero Crossover one...I have been using them
    on 1/2hp motors for 8 years with no failure
    and they are outside where the temps are +30c
    in the summer to -20c in the winter.

    kip
     
  6. Franc Zabkar

    Franc Zabkar Guest

    I'd concur with those who recommend the zero crossing types. For an
    inductive load ...

    V = L dI/dt + IR

    .... so if V=0 at t=0, then I=0 and dI/dt = 0.

    This ensures the softest start.

    A capacitive load (eg main filter caps in PSUs) will also benefit from
    zero-voltage startup as I = C dV/dt.


    - Franc Zabkar
     
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