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  1. #1
    Join Date
    Apr 2013
    Location
    Brisbane
    Posts
    619

    Default Reverse Single Phase Motor - Re-wire

    I went to connect up a motor (run of the mill Chinese 3HP motor) to a saw I am restoring on the weekend. (Can read about it here: Wolfenden Table Saw). The motor comes with a Double Pole Single Phase Safety Switch (KJD178 IP55). This is pretty handy but incorporates a little bit of complexity as it has two leads running to the motor.
    1) The power source
    2) The actual ON/OFF switch

    When I did a test run I realised the motor is spinning clockwise. On any other motor I've had it's had a terminal box and you can just switch around bridging to re-configure it per instructions on the motor. On this motor it doesn't have a terminal box OR instructions. I assume it can be reversed (can't be more than about 10yr old motor). From the drawing I've done up is someone able to advise what config needs to change to make it go anti-clockwise?

    Wiring.jpg

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  3. #2
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,756

    Default

    Reversing an SP motor requires reversal of EITHER the main/run coil leads OR start coil leads. On your motor it appears this cannot be achieved outside the motor and the motor has to be opened up, the relevant connections broken and remade. This is not a task for most DIYers - suggest you take it to a motor reminders.

  4. #3
    Join Date
    May 1999
    Location
    Grovedale (Geelong) Victoria
    Age
    74
    Posts
    12,183

    Default

    DISCLAIMER
    No liability is accepted by UBeaut, the Wood Working Forum's
    administrators or moderators for advice offered by members
    posting replies or asking questions regarding electrical work.

    We strongly advise contacting a licensed
    Tradesperson for all electrical work.
    WARNING
    Information supplied within posts is not to be considered
    as detailed formal instructions to complete a task.

    Members following such information do so at their own risk.

  5. #4
    Join Date
    Apr 2013
    Location
    Brisbane
    Posts
    619

    Default

    Thanks Bob, I think I'll keep this motor for one of the bandsaws I am restoring and buy a new one - simple way out and cost effective

  6. #5
    Join Date
    Sep 2006
    Location
    Australind ,WA
    Age
    58
    Posts
    849

    Default

    Quote Originally Posted by BobL View Post
    Reversing an SP motor requires reversal of EITHER the main/run coil leads OR start coil leads. On your motor it appears this cannot be achieved outside the motor and the motor has to be opened up, the relevant connections broken and remade. This is not a task for most DIYers - suggest you take it to a motor reminders.

    What Bob said....

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