Automatic Reversing Relay circuit for DC motor

Discussion in 'General Electronics Chat' started by phuzionz, Apr 23, 2009.

  1. phuzionz

    Thread Starter Active Member

    Dec 5, 2008
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    I'am looking for a circuit to reverse my electrical cylinder(sorry for the tittle, but is same principle)). It is a 24VDC version.
    I want to work with relays because i have them already in stock.
    The circuit must be detect automatically when to switch (maximum length). Therefore i have proximity swiches.

    Can somebody explain me how to do it and provide with a scheme.
    I have found this link, but i can't do nothing with that i think.
    http://www.electronics-lab.com/projects/motor_light/012/index.html

    Thank you very much
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Do you want it to oscillate between limits, or go to a limit and stop until you reverse it?

    Ken
     
  3. phuzionz

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    Dec 5, 2008
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    That it oscillate between two limits.
     
  4. KMoffett

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    Dec 19, 2007
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    This is simple and might do it for you. One problem with automatic reversing, is switching polarity on a running motor. This depends a lot on the inertia of the system.

    Ken
     
  5. phuzionz

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    Dec 5, 2008
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    Thank you, but it is a part of the scheme.
    How are you detecting when you are on the end.
    So my motor is driving something, when this object reaches his position, the motor must turn his direction. Therefore i have proximity swithes.
    Can i place these somewhere in the scheme?
     
  6. KMoffett

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    Do you have a link to the proximity switches you want to use? I was assuming mechanical switches.

    Ken
     
  7. phuzionz

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    Dec 5, 2008
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    No I have a 2 inductive proximity sensors with NO contacts.
    It has 3 output wires with a PNP output.
     
    Last edited: Apr 29, 2009
  8. KMoffett

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    What is the output voltage and current capability of the sensor. A link, or make and model #, would help. And how much current does your motor draw?

    Ken
     
    Last edited: Apr 29, 2009
  9. phuzionz

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    Dec 5, 2008
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  10. KMoffett

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    Dec 19, 2007
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    From the specs for your sensors, they can provide 200mA to drive a load. That's why it's important. I needed to know if they could drive a relay directly, or would require an external transistor or MOSFET. The 24VDC/10A two-coil magnetic latching DPDT relay in my circuit draws only 50mA. So, the attached should do what you want. I have no idea where you are, but that relay is ~$16US at Mouser Electronics.

    Ken
     
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