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Thread: Newer Porter-Cable VS Grinder Died - Need Some Motor Help

  1. #1
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    Newer Porter-Cable VS Grinder Died - Need Some Motor Help

    I have a Porter-Cable 8" variable speed grinder that worked for a total of only hours, including balancing and so forth. The unit is out of warranty. Investigation showed a blown fuse which I was finally able to acquire through Amazon. New fuse blew immediately, no surprise there. As far as I can tell with a VOM (no capacitance setting) meter the start cap appears good.

    Below are pictures of the device. The AC power cord runs into the control circuit board where the fuse is. A set of three wires runs from the control circuit board to the variable speed control and another similar cord runs to the motor. This is the only wire(s) going to the motor except for the capacitor.

    Taking it to a repair shop will cost more than the unit is worth. Any educated or otherwise obtained ideas?

    Overall shot:

    Attachment 88372

    Wires enter and exit control circuit board:

    Attachment 88373

    Cable with three wires runs to VS control:

    Attachment 88374

    Cable with three wires runs into motor housing:

    Attachment 88375

    I'd be very happy if I could just get it to run without the variable speed. I would be very, very happy if I could get it to run at only a low speed.
    Last edited by Jim C Bradley; 01-05-2015 at 01:59 AM.
    First of all you have to be smarter than the machine.
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  2. #2
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    Guess = Something on the PC board took a nose dive???

    I've had an electrical storm waste a coffee maker with a PC board--bricked it.

    (My coffee tastes the same as it did in the old machine without the PC board--LOL)
    It's kind of fun to do the impossible

  3. #3
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    is this a burnt wire, or maybe it pulled out from somewhere?
    Click image for larger version. 

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    The perception of perfection is perfectly clear to everyone else

  4. #4
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    Quote Originally Posted by Ken Cook View Post
    is this a burnt wire, or maybe it pulled out from somewhere?
    Click image for larger version. 

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    Sorry, I should have mentioned that I removed the capacitor to test it and it is still out of the machine.
    First of all you have to be smarter than the machine.
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  5. #5
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    Quote Originally Posted by Jim C Bradley View Post
    Sorry, I should have mentioned that I removed the capacitor to test it and it is still out of the machine.
    Shoot, thought I was finally going to be able to offer something back to the site...no help here as usual lol
    The perception of perfection is perfectly clear to everyone else

  6. #6
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    http://www.sawmillcreek.org/showthre...rinder-problem - same problem - ended up being a blown board.

    http://www.ereplacementparts.com/por...11_130232.html - (I think? that's your machine) claims the board is $46 - ouch!
    http://servicenet.blackanddecker.com.../Detail/284076 - $40 here (black and decker, but looks? like the same unit? maybe?).

    Don't really know what kind of motor that has, might be able to just rig up some other sort of regulator to tune the speed down cheaper maybe.. (not sure if its voltage or frequency being changed here).

  7. #7
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    If you bought it at Lowes they will replace it for you if it is the same model that's on their shelf. Just bring it in and ask for an exchange.
    Faith, Hope & Charity

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  9. #9
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    Thanks to all. I will have to think on this a bit.
    First of all you have to be smarter than the machine.
    VOTING MEMBER

  10. #10
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    I know that it may be of no help, but unless the variable speed is critical for what you want, you could try bypassing the board and converting it in a fixed speed grinder, at least you would have a machine that would have a use.
    Best regards,
    Toni

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