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What Type of Solid State Relay to use with my Temperature Controller

Discussion in 'Electronic Repair' started by Scrim, Apr 4, 2007.

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  1. Scrim

    Scrim Guest

    I have a Watlow F4 Temperature controller (full Part No. F4PH-CAAA001RG). I
    want to connect a solid state relay to its "Switched DC" output so I get
    zero crossing switching but I'm unsure if this requires a SSR with random or
    Zero Crossing switching. The manual doesn't help:

    The F4 manual does mention "Burst Fire" which uses zero crossing detection,
    so I suspect that the switched DC output can drive either type of SSR so
    long as the controller and SSR are connected to the same mains supply so the
    phases are matched.

    Or have I misunderstood what's going on?


  2. spam

    spam Guest

    According to the product brochure,

    the controller you have is rated 100-240V AC/DC and has one
    open-collector DC output, with an update rate of only 20Hz.

    If you wanted the controller to detect zero-crossing, apparently you
    would need a different controller, the one with the solid-state relay

    To use the controller you have, I would suggest connecting a
    solid-state relay with its own zero-crossing detection.
  3. GregS

    GregS Guest

    I don't even know what their ramp and soak mean. When I use a linear ramp
    controller, I feed the DC control voltage to a Mosfet to control voltage linearly.

    Yes, a SSR with zero crossing turn on at the zero point, and off at the zero point.

    We use linear ramps so it has no switching noise.

  4. Scrim

    Scrim Guest

    Thanks folks. I've also just worked out that the P in F4P (as apposed to an
    S or D) means this isn't a ramping controller as I'd assumed. It seems
    Watlow like to keep their guidance cryptic for some reason!

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