Three phase 415V compressor had a short on one of its three windings, this compressor is wired in delta hence the six terminals.

Five of the terminals tested ok but the sixth had a 0.02 megaohm short to ground.

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11 thoughts on “Shorted Copeland compressor motor

  1. Fritz Rochester says:

    Hey John !!!
    Still need a little more Help to Understand Megger , probably gonna sound like a Dumb Ass , but ,John are we lookin for a 100 meggs or more to indicate No Short , below 100 possible insulation degradation , below 50 Short ?

    I love the Megger Videos !!!

    Great Job John !!!

  2. heavydiesel says:

    Hi Fritz!
    Had years watching my Dad work (school holidays etc) to get the idea of how to look for shorts!
    Its the opposite to normal resistance testing of windings/coils where you want a low reading to show its not open circuit. With meggering you are testing for electrical short to ground so any reading under infinity shows a short to some degree. Usually a good motor will be 20megaohm or well above and they start getting really suspect below 1megeohm. Will do a how to vid starting at basics!

  3. FixitFrank says:

    Hi. I have been meaning to tell you that I was able to repair a home AC compressor for my parents because I watched your vids. Their contactor had an open coil. The HVAC company wanted to install a new compressor! Thanks for posting great content. -Frank

  4. heavydiesel says:

    Thats great Frank! I'm pleased you were able to fix it!

    I've been called to compressors that have been diagnosed faulty only to find its a relay or capacitor etc, never know whether it was incompetency or dishonesty by the original company, i prefer to think its incompetancy as they have a chance to learn to diagnose better in future 🙂

  5. heavydiesel says:

    I usually test at about twice the supply voltage, so on this 415V compressor i'd be on the 1000V test range.
    If there is any doubt then test as near to the supply voltage, e.g. 500V in this case, and you should be ok.
    There are some smaller compressors that have internal ptc devices that may be damaged by testing at too high a voltage, these would mostly be fractional horspower motors, it pays to read the label on the compressor to check for guidelines etc.

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