Linear Actuator Automatic Reverse Travel

Discussion in 'General Electronics Chat' started by zambonya, May 8, 2009.

  1. zambonya

    Thread Starter New Member

    Apr 17, 2009
    3
    0
    Hello,

    I am working on a project that requires the following:

    A NO button is pressed causing the linear actuator to travel forward, until hitting a NC limit switch. The actuator then travels backwards until it hits a another NC limit switch, causing it to stop. I have been experimenting with different circuits and have attached one diagram. If you look at my circuit drawing my problem is that when limit 1 is hit causing reversal the limit switch will close again causing continuous forward backward travel. Any comments are highly appreciated. Both relays are DPDT. Thanks
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    You have an even bigger problem. In the circuit shown, no current will ever pass through the motor.
     
  3. zambonya

    Thread Starter New Member

    Apr 17, 2009
    3
    0
    Looks like I have attached both leads of the right relay to -12 V. Attached should be the corrected one. Thanks
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    It looks like you may need to put some kind of latch function across the reversing limit switch, otherwise as soon as the traveler moves off the switch, it would go back into the forward direction and just bounce back and forth.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Try this:
    [​IMG]
     
    Last edited: May 9, 2009
  6. zambonya

    Thread Starter New Member

    Apr 17, 2009
    3
    0
    Thanks a lot wookie.
     
    Last edited: May 9, 2009
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