Reversing a DC Motor with a DPDT Relay and DPDT switch

Discussion in 'The Projects Forum' started by CKAranch, Apr 2, 2019.

  1. CKAranch

    Thread Starter New Member

    Mar 17, 2019
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    I have a DC motor that is controlled by a DPDT control box which is a DPDT relay. The Relay Box is controlled with automation software( Z wave). I would like to add a manual DPDT switch to control the motor without having to use a smartphone or computer.I can't find what I think would a be a 3 way DC motor reversing circuit. Any circuit diagram suggestions?
     
  2. Roeland Kroes

    New Member

    Oct 20, 2016
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  3. Yaakov

    Well-Known Member

    Jan 27, 2019
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    While that arrangement does allow reversing, it also changes the meaning of forward and reverse for the software control.

    This might be OK for the application but I am guessing it is an unwanted "feature".

    @CKAranch can you modify the current controller?

    What voltage and current are involved?
     
  4. DNA Robotics

    Active Member

    Jun 13, 2014
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  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    If your motor is anything other than a tiny one, suddenly reversing it without allowing it to come to a stop can cause damage. A switch with a centre-off position is advisable.
     
    dendad likes this.
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    There is also switches intended for motor reversal and have a couple of features, one is that it is impossible to go from F to R without stopping at centre off ( the toggle has to be released for further action), they also have a option of placing a resistor across the motor when at centre off.
    They are used in KB DC motor controllers and can be obtained from them or any distrubutor.
    Max.
     
  7. Yaakov

    Well-Known Member

    Jan 27, 2019
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    These are called "hesitation" switches, and are available from several manufacturers.
     
  8. rick fuller

    New Member

    Sep 24, 2017
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    I recently ran into a similar situation. I had a double throw, double pole with no off in the middle. I used a notmally open push button switch. In this way I could set switch to "forward" and push button to actuate motor. In many ways this turned out to be better than a dpdt with an off position since it gives me more precise control of where my motor stops. My application was a self lifting ergonomic work bench made using the motors from a power passenger seat out of a dodge charger.
     
  9. CKAranch

    Thread Starter New Member

    Mar 17, 2019
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    The voltage of the motor being controlled is 24VDC I have a 12V DC power supply and a 24 V DC power supply to install in the control box. 12VDC for the control board and 24 for the motor. I did not know at the time they make a 24V version which I might change to in the future

    The motor will be in one direction at sunset and then go in the reverse direction at sunrise. The switch I want to manually control it with is a center off DPDT Leviton switch. The reason for the manual control is I can change this from blackout mode to rolling up the sides to cool when it gets hot and the blackout cover is not needed.
     
  10. killivolt

    Distinguished Member

    Jan 10, 2010
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    931
    Why not just use optical sensors, one for evening one for morning, then place SPDT on either end or use Transistors in conjunction with the optics.

    kv
     
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