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IndustryArena Forum > CNC Electronics > Phase Converters > Rotary 3-phase converter
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  1. #1
    Join Date
    Jan 2011
    Posts
    129

    Rotary 3-phase converter

    I have a rotary phase converter that’s capable of running a total of 20 hp. According to the data plate, although it will handle a total of 20 hp, it will only start a maximum of a 7 1/2 hp three phase motor.
    Y
    My dilemma is I want to run a milling machine that has a 15 hp spindle motor.

    Considering the 7 1/2 hp limitation, they have to be considering motors that start under load, like compressors or pumps, etc.

    Since my spindle motor would never start under any load I’m wondering if I could use this particular rotary phase converter on the milling machine.

    Does anyone have any experience relative to my question?

    Thanks,
    Chuck

  2. #2
    Join Date
    Dec 2013
    Posts
    5717

    Re: Rotary 3-phase converter

    Based on my limited experience with RPCs I'll say that it should work fine. I've had no problems starting a 10HP spindle motor on a 15HP RPC. Having said that, the spindle is operated by a VFD so it doesn't start across the line, ramp up is about 1.5-2 seconds or so.

    If you have a VFD or other controller on your spindle I would say there is no problem.
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
    Join Date
    Jan 2011
    Posts
    129
    Quote Originally Posted by Jim Dawson View Post
    Based on my limited experience with RPCs I'll say that it should work fine. I've had no problems starting a 10HP spindle motor on a 15HP RPC. Having said that, the spindle is operated by a VFD so it doesn't start across the line, ramp up is about 1.5-2 seconds or so.

    If you have a VFD or other controller on your spindle I would say there is no problem.
    Thanks Jim, I will give it a try.

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