Rotary 3-phase converter

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Thread: Rotary 3-phase converter

  1. #1
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    Default 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

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  2. #2
    Community Moderator Jim Dawson's Avatar
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    Default 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


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    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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