Reverse Polarity (after power stops)

Discussion in 'The Projects Forum' started by InfoSponge, Apr 21, 2011.

  1. InfoSponge

    Thread Starter New Member

    Apr 21, 2011
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    Heres what I need to achieve. When a/the timer stops powering 1-90 sec.
    I need to reverse polarity and retract a linear actuator.
    Timer powers actuator to open but I need it to close after timer powers off.
    Or any other Suggestions? [​IMG]

    Timer 6v or 12v
    Actuator 6v or 12v
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Welcome.
    What are the actuator voltage and current ratings?
     
  3. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    [​IMG]


    Motor travels one direction when timer is 'on'.

    Motor travels opposite direction when timer is 'off'.

    Motor stops at full retract or extend limits, no matter what state 'timer' is in.

    One additional relay is needed to make motor 'pause' in whatever position you need it. I didn't draw that part. Let me know if you need that feature.
     
  4. strantor

    AAC Fanatic!

    Oct 3, 2010
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    If you are extending and you hit the limit, you won't be able to retract again unless you can physically move the actuator off the limit switch & vise versa.
     
  5. strantor

    AAC Fanatic!

    Oct 3, 2010
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    [​IMG]
     
    Last edited: Apr 22, 2011
  6. InfoSponge

    Thread Starter New Member

    Apr 21, 2011
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  7. InfoSponge

    Thread Starter New Member

    Apr 21, 2011
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    Okay I am a Newbie/Sophomore and am sorry to ask can this be explained in layman's terms. I do understand a bit.
    I want it to fully retract first (Power on) then fully extend when power shuts off. Then be ready to do the same procedure when the timer restarts. This will happen several times a day.
     
    Last edited: Apr 26, 2011
  8. williamj

    Active Member

    Sep 3, 2009
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    Okay, now I'm confused. Do you want the timer to control the circuit power or the actuator?

    In your original post I got the impression that the actuator was controlled by the timer but in you last post I get the impression that the circuit power is controlled by the timer.

    Curiouser and curiouser, can you clarify?

    williamj
     
  9. InfoSponge

    Thread Starter New Member

    Apr 21, 2011
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    0
    Timer controls the actuator 1st (retracts)
    when actuator is fully retracted it will hit the built in limits switch
    shutting off the actuator. The timer will still be running, say 30secs.
    Once the timer stops running/power then the actuator needs to 2nd (extend) till it hits the built in limit switch then at this point the total system is now ready for the next timed session.

    [ I believe your first impression is correct ]
     
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