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Reverse Direction On Electric Motor?

Discussion in 'Grinders' started by Jordan D, Feb 16, 2021.

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  1. Jordan D

    Jordan D New Member

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    Hi All,

    I've seen a setup on some home built disc grinders where two switches are use to reverse the rotation direction. I assume one is to reverse direction, while the other switches direction? I can't seem to find any diagrams online that show this. Anyone here have any ideas/pictures?

    Or any other ideas on how to reverse direction?
     
  2. dancom

    dancom Dust Maker

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    Hi Jordan,

    Usually we use one to turn the motor on and off, and the other reverse the motor direction.
    The motor will need to have the start winding wires brought out to the terminal box. There will be a statement on the wiring label or nameplate htat says something like "to reverse rotation, interchange red and black wires". If it says that, then it's pretty basic to add a rotation switch. I could sketch you a diagram if you take a pic of the terminal box and wiring label.

    Side note: Once the motor is up and running, switching the Forward/Reverse switch doesn't do anything as that circuit only works when the motor is starting.

    Dan
     
  3. Jordan D

    Jordan D New Member

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    Thanks, I'll take a picture this evening and post it. Its a 2HP TEFC from Princess Auto.
     
  4. dancom

    dancom Dust Maker

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    Last edited: Feb 17, 2021
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  5. dancom

    dancom Dust Maker

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    Rule of thumb is to swap T5 and T8. It would be nice to be sure, but this is what I had in my files. This was for a Brook-Compton motor a fiend of mine was making into a disc grinder last year. A couple of points, that should be clarified. The 2hp single phase motor is going to need a decent switch. Most toggle switches are inadequate for interrupting high-inductance loads. I'd recommend a rated motor switch like this one on Amazon.ca I would highly recommend going with the 230V supply for a 2hp. You can extend the reversing switch wires and put the switch in a box along with the power switch. This would make a kind of control console.

    [​IMG]

    [​IMG]

    Let me know if you have any issues.

    Dan
     
    Last edited: Feb 17, 2021
  6. Jordan D

    Jordan D New Member

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    Yes thats the one I have. I'll confirm the wiring diagram tonight. I have a light switch wired in the power cord right now to turn it on and off, and right now its wired for 115V. Its a bit of a homemade beast, but it seems to do the trick. I'll grab a few detailed pictures tonight. thanks for the help
     
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  7. Jordan D

    Jordan D New Member

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    This is the tag on the motor. [​IMG]

    [​IMG]
    [​IMG]

    Yeah looks like switching between T5 and T8 would reverse it
     
  8. Jordan D

    Jordan D New Member

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    Got the switches installed. Thanks again for the help Dan!
     
  9. dancom

    dancom Dust Maker

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    I am glad to be of help. Hope it works well for you.

    Dan
     

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