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Remote Control Dual Linear Actuators

Discussion in 'Electronic Design' started by j1mmyZ, May 9, 2007.

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  1. j1mmyZ

    j1mmyZ Guest

    I have two 115VAC 1.6A Linear Actuators that I'm using to raise and
    lower a scissor lift contraption. I currently use a DPDT switch (on-
    off-on) to control the direction of the actuators, the Actuators have
    built-in limit switches.

    Because of the design of the Contraption the dpdt switch is not a
    convenient means to turn the actuators on and off. I would like to
    integrate an X-10 appliance module with a DPDT relay to run the
    actuators? Is this a suitable or even possible application for a DPDT
    relay? OR is their a simpler circuit that I could create?

    thanks in advance,
    james
     
  2. ehsjr

    ehsjr Guest

    Do you have access to the limit switches where you
    can wire them yourself? I have a system where I
    use the limit switches to drop out the run relay.
    The run relay is activated when the direction relay
    changes from energized to de-energized or vice versa.
    The direction relay is 3PDT, the run relay is SPST.
    The direction relay is controlled by a toggle switch.
    You could use an X-10 to provide the toggle switch
    function. That would initiate a cycle where the
    acutators go from fully extended to fully retracted
    (or vice versa), then stop. If you want the capability
    to stop somewhere in between, then a single X-10 driving
    a DPDT relay won't do it.

    Ed
     
  3. j1mmyZ

    j1mmyZ Guest

    I don't have to stop it in the middle and so my basic dpdt relay would
    work. I've never tried this sort of application and am very much self
    taught. I did manage to create a PWM to use as a thermostat which I
    connected to a couple of TEC's but I'm not so familiar with using
    relays. On another thought, would an h-bridge allow me to stop in the
    middle if I wanted? I don't have to use an x-10 module (I have some
    lying around) I just wanted something simple that would allow remote/
    wireless control of the circuit.

    thanks again,
    james
     
  4. ehsjr

    ehsjr Guest

    Here's how mine is wired:

    AC ----+-------------------------+------+
    | | |
    [RY1] [RY2] |
    | | |
    o | |
    / Run Sw | [Motor]
    Up o o Down | |
    | | |
    | | o
    o---+ Up Limit Sw | | <| Ry2-1
    / | / | |
    AC --o o---+---o o-------+ | o
    U D | | | |
    Run | v | |
    Sw | ---o---+ |
    | |
    +---o->o---o---^ Ry1-1 |
    | Lo Limit Sw |
    | |
    +----o o----+
    |Ry1-2 Ry1-3 |
    |> |<------+----------|> |<---+
    | | |
    | | |
    | | |
    | [Reverse coil] |
    | | |
    +----------+------------------+

    My motor has 2 coils. By changing the polarity of one coil with
    respect to the other, the motor reverses. That function -
    changing the polarity - is done by Ry1-2 and Ry1-3.

    The DPDT center off run switch determines whether RY1 will be
    energized or deenergized.

    The limit switches control RY2. When at the lower limit, the lo
    limit switch is open; when at the upper limit, the up limit
    switch is open. Anwhere in between, and both limit switches
    are closed. The RY1-1 point determines which limit switch
    is in series with the RY2 coil. Thus, when the mechanism is
    travelling up, the upper limit switch is selected; when it
    is travelling down, the lower limit switch is selected.

    Ry2-1 controls whether the motor runs or not.

    As shown in the diagram, the motor has reached the upper limit,
    opening the Up switch and de-energizing RY2. Ry1 is not energized,
    because the run switch is in the up position. If you move the
    run switch to the down position, RY1 will energize, which in turn
    will energize RY2 through the lower limit switch and the RY1-1
    contact.

    You could use your X-10 system to control a SPDT relay, and use
    the relay contacts in place of the upper portion of the run switch
    in the above diagram. Assuming your motor works the same as mine,
    and that you can get to the limit switches to wire them
    up per the above, you can use the circuit.

    Ed
     
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