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Thread: single phase reversing contactor

  1. #1
    Join Date
    Aug 2008
    Posts
    18

    Smile single phase reversing contactor

    Hello,

    I have a single phase motor(230V) that can be made to forward/reverse by wiring according to this information:

    CCW:
    L1 --------------- P1
    L2 --------------- T4 -T5
    T2-T3-T8
    P2

    CW:
    L1 --------------- P1
    L2 --------------- T4 -T8
    T2-T3-T5
    P2

    Can I do this with a reversing contactor, and a 3C cable?
    The reversing cable I have has 7 poles, a 3pole with 1 aux, interlocked to another 3 pole.

    help!!!!!!!!!

  2. #2
    Join Date
    Sep 2004
    Location
    Durham, NC
    Posts
    5,270
    I sure hope someone throws in some diagrams and pictures , terminating on L2 sounds like a trip....
    If your even thirsty, your two quarts low.

  3. #3
    Join Date
    May 2003
    Location
    Leesburg, VA
    Posts
    6,933
    Assuming what you say is correct, I believe you can do this, But I would need to draw it out, scan it in and from home that ain't happening.

    Someone else with better control drawing capabilities will chime in.
    Brian John
    Leesburg, VA

  4. #4
    Join Date
    Apr 2008
    Location
    Ann Arbor, Michigan
    Posts
    4,706
    080823-0927 EST

    cjphelps:

    It appears you want to swap T5 and T8 between L2 and T2. That requires a DPDT switch function and 4 wires.

    If you had a 3 phase motor it would require 2 leads to be swapped to change direction and the same DPDT function.
    .
    Last edited by gar; 08-23-08 at 11:33 AM.

  5. #5
    Join Date
    Aug 2008
    Posts
    18
    Hi yeah its a single phase motor,

    Can I do it with a starting contactor? (2 contacctors connected through interlock switch?
    If so , I am still a little confused about how to wire it using a 3C cable.

  6. #6
    Join Date
    Jan 2004
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    Must you use a contactor? A drum switch will be cheaper, if you can use it.

  7. #7
    Join Date
    Mar 2003
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    New England
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    Quote Originally Posted by mdshunk
    Must you use a contactor? A drum switch will be cheaper, if you can use it.
    Ya. Quite cheaper. $20 or $30 at Grainger. I had this issue when I need to wire up a lathe. Reversing starter or drum switch....hmmmm....tough choice.

  8. #8
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    Jan 2004
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    Right here.
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    Just looked at the wiring layout again... essentially all you're doing is moving T5 and T8 around to change rotation. Yeah, I'd use a drum switch if I could.

  9. #9
    Join Date
    Mar 2003
    Location
    New England
    Posts
    10,430
    Quote Originally Posted by mdshunk
    Yeah, I'd use a drum switch if I could.
    As would I.

    One major drawback to the drumswitch is that there is almost zero room for the conductors within the enclosure. It takes some careful make-up of the conductors, and sledgehammer to get the cover on.

  10. #10
    Join Date
    Jul 2007
    Posts
    3,100
    To reverse a single phase motor, the start winding is reversed, which according to the information given is T5 andT8. I would give you a drawing, but my drawing program uses too many bytes to post on this forum. Two three pole contactors are used, which are mechanically and electrically interlocked. (Thats what the auxillary contact is used for) The contactor is wired basically as a double throw switch, reversing the start winding depending which contactor is energized. They are expensive, expect to pay from $200 bucks and up depending on the size you need. Drum controllers are from $30 and up.

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