Phase rotation meter what's the purpose - Page 2
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  1. #21
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    Quote Originally Posted by Peter from Holland View Post
    it does not rely on color It relays on the letters RS and T on the terminals or outlets

    Peter
    Can't say I've ever seen those designations on breakers or panels.

  2. #22
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    R, S, T is the EU designation.

    In my experience maybe 1/10 facilities have the three phase spinning 'backwards' from the grid. Always handy... even worse if you do a mains or transformer change and no-one checked what it was *before* they shut it down - you can't just assume it should be clockwise or all the equipment on site that was wired for anticlockwise is now scrap.

    Synchroscopes are needed where you've got a mains-parallel generator, where both the mains and generator are simultaneously connected to the load for a period. They're not needed if you have a standard transfer switch with only one generator and an interlock so you can't close both simultaneously.

  3. #23
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    I saw this one listed, seemed like a pretty complex piece of equipment to do a pretty simple task.

    BTW my lathe with a solid state drive requires phase ic correct order, I just moved wires till I got it to work.

    Bob
    Attached Thumbnails Attached Thumbnails phase.jpg  

  4. #24
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    That's an old-school phase rotation meter, frequency meter (x2?), and a selector switch so you can presumably look at L-L and L-N voltages on each phase.

    A more typical modern one is something like this: https://www.amazon.com/Extech-PRT200.../dp/B009VHWHTK

    You can also find them built into a variety of other meters, and even some non-contact meters that you hold up to each phase in turn.

  5. #25
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    Default Rotation Meter

    Here is a picture of my old school rotation meter, just some lights and an inductor. So 2 glow brighter and the other 2 glow duller to show one direction. It came from a large industrial plant which had socket outlets installed everywhere so motor driven DC welders could be used, and this just verified motors rotated in right direction.

    Jim
    Attached Thumbnails Attached Thumbnails 20210414_103913.jpg   20210414_104003.jpg  

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  7. #26
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    Ooh, proper plugs!

  8. #27
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