Linear Actuator Help

Discussion in 'The Projects Forum' started by spencergs, Feb 28, 2012.

  1. spencergs

    Thread Starter New Member

    Feb 28, 2012
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    Hey guys, this is something I thought I could figure out on my own, but I need help. :(

    I have a Firgelli Automations linear track actuator. I need to control it with 3 momentary push buttons; UP, DOWN, and STOP. With a single press of the up or down buttons, I need it to travel to an external limit switch. I am hoping this can be done with relays.

    Here's a diagram I'm using to help understand how the actuator works:
     
  2. BillB3857

    Senior Member

    Feb 28, 2009
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  3. spencergs

    Thread Starter New Member

    Feb 28, 2012
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    Thanks for the link, Bill. Unfortunately it doesn't seem to do what I'd like it to do. I need the actuator to stay on until it reaches the limit switch, without sustained input.

    If anyone could help me with a custom circuit diagram, I can compensate you for your time with a paypal payment. Please send me a PM if interested.
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
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    All you need to do is add two diodes to the circuit I linked to. One from each swing arm of the appropriate relay back to the top of the same relay coil. Example.... If left relay is picked up, the swing arm will be tied to +12V and latch that relay in an ON state through the diode. (Cathode of diode would go toward the coil, anode to swing arm) Duplicate for the RIGHT side. The push button shown to the far left and right would represent the limit switches. Tie the two lines shown as going to ground for the limit switches to a common line and place a Normally Closed STOP switch in series to ground. That should give you what you want.

    I couldn't find SgtWookies version, so did a quick redraw of what should work for you.
     
    spencergs and luvv like this.
  5. spencergs

    Thread Starter New Member

    Feb 28, 2012
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    Hi Bill, that works perfectly. Thank you!!
     
  6. BillB3857

    Senior Member

    Feb 28, 2009
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    Glad to help. That's what this forum is all about! Credit also goes to SgtWookie since this is really a knockoff of his design.
     
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