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  1. #16
    BobL is offline Member: Blue and white apron brigade
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    I like Rays summary and agree the wow-wow sound is a strong sign the run coil is gone.

    I notice you tried to start it "by spinning the wheel".
    Just in case, try removing the wheel and rotating the shaft, as the wheel itself may represent too high a starting torque for a manual type start.

  2. #17
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    May 2012
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    By some unlikely coincidence both my lathe and compressor died with similar symptoms on Sunday.

    Compressor would start slowly and stall once pressure started to build up.

    Lathe would spin up very slowly and maybe come up to full speed eventually.

    Compressor is definitely the run cap, it's spilled it's guts.

    I suspect the the lathe is the same but I have to pull it away from a wall to get at the cap.

    Anybody know what the cap specs are for an AL320G ?

  3. #18
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    A few years back my chop saw developed that symptom and just stood and hummed without spinning up !
    Now its one of those motors without a centrifugal switch, the capacitor is permanently in circuit. Getting a new cap was no problem at all. But it didn't fix the problem.

    At the time there was a motor rewind shop just down the road and I took the motor there. The following day the guy who I went to see, phoned and said to come and pick the motor up. It turned out that the run winding had a break in the wire to the terminal block and only the fabric of the insulation was holding the wire in place. The conclusion was that mechanical fatigue due to vibration during use had caused the wire to part company with the brass ring that secured it to the terminal.

    So its worth having a very close look at any wires that are effectively unsupported.
    Best Regards:
    Baron J.

  4. #19
    Join Date
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    Quote Originally Posted by P J View Post
    By some unlikely coincidence both my lathe and compressor died with similar symptoms on Sunday.

    Compressor would start slowly and stall once pressure started to build up.

    Lathe would spin up very slowly and maybe come up to full speed eventually.

    Compressor is definitely the run cap, it's spilled it's guts.

    I suspect the the lathe is the same but I have to pull it away from a wall to get at the cap.

    Anybody know what the cap specs are for an AL320G ?
    Second post in this thread will answer your question.
    http://www.woodworkforums.com/showthread.php?t=188669
    Matt
    Warning Disclaimer

  5. #20
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    May 2012
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    Oakleigh, Victoria
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    All sorted now.

    I popped into Hare and Forbes yesterday, they didn't have caps on the shelf but they couriered me a set to me today.

    Original

    Start cap 250 VAC 50-60Hz 100uF
    Run cap 450VAC 50-60 Hz 25uF

    Replacement values are a little different, but I got the feeling that they sell of lot of this combination.

    Start cap 125 VAC 50-60Hz 108-130uF
    Run cap 450VAC 50-60 Hz 20uF

    New 65uF run cap fixed the compressor too.

  6. #21
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    Crikey! Don't expect the starting cap to last long! At a 125V rating and getting belted with 240V every time you start the machine, it will probably pop it's top in just a few starts..... send it back and get at least a 240V one.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  7. #22
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    Sep 2012
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    Quote Originally Posted by jhovel View Post
    Crikey! Don't expect the starting cap to last long! At a 125V rating and getting belted with 240V every time you start the machine, it will probably pop it's top in just a few starts..... send it back and get at least a 240V one.
    I agree ! Unless that is a typo You need a minimum working voltage of 240 VAC for that cap, preferably 380 VAC.
    We are using 230/240 VAC here in the UK and the caps are usually 380 and 550 VAC working voltage.
    Best Regards:
    Baron J.

  8. #23
    Join Date
    May 2012
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    Quote Originally Posted by jhovel View Post
    Crikey! Don't expect the starting cap to last long! At a 125V rating and getting belted with 240V every time you start the machine, it will probably pop it's top in just a few starts..... send it back and get at least a 240V one.
    Yeah, I figured as much.

    I had some urgent work to do so it had to go in.

    I'll order a correctly rated one and swap it out later.

  9. #24
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    Jul 2009
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    Melbourne
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    http://au.rs-online.com/web/p/alumin...itors/0117215/

    should not be an issue tho, any motor winder will probably have them in stock

    Regards

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