Anyone using a VFD / Phase converter to run your 3 phase equipment from single phase
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    Anyone using a VFD / Phase converter to run your 3 phase equipment from single phase

    I’ve e been using a static phase converter to run a 220V 3PH lathe for years. No problem with that. Now I have another Bridgeport mill to hook up and I am learning that we now have variable frequency drives that not only let you adjust the motor speed (within certain parameters) but these VFDs will also act as phase converters AND (this is the part that blows my mind) will produce 220V 3PH output from 110V 1PH input.

    Assuming you use the correct size VFD (in my case a 1HP motor on the Bridgeport) are there any downsides to using this 110V 1PH in / 220 3PH out device?

    I was recommended a Lenze VFD.

    (It all sounds too good to be true.)
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    Jer
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    Quote Originally Posted by lukebarber View Post
    I’ve e been using a static phase converter to run a 220V 3PH lathe for years. No problem with that. Now I have another Bridgeport mill to hook up and I am learning that we now have variable frequency drives that not only let you adjust the motor speed (within certain parameters) but these VFDs will also act as phase converters AND (this is the part that blows my mind) will produce 220V 3PH output from 110V 1PH input.

    Assuming you use the correct size VFD (in my case a 1HP motor on the Bridgeport) are there any downsides to using this 110V 1PH in / 220 3PH out device?

    I was recommended a Lenze VFD.

    (It all sounds too good to be true.)
    I don't have 3 phase, or a VFD (yet), but I've been doing a lot of reading about them as they pertain to brewing. They come into play for pumps as well as the motor controls for the rakes and plows in the kettles.

    The guys that use the digital/solid state VFD's for transfer pumps in the brewery are really happy with them. It allows them to use good old 110v yet still have variable speed control of the pump. Lenze is a name i've heard spoke of in a positive light.

    -J.
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    Quote Originally Posted by lukebarber View Post
    I’ve e been using a static phase converter to run a 220V 3PH lathe for years. No problem with that. Now I have another Bridgeport mill to hook up and I am learning that we now have variable frequency drives that not only let you adjust the motor speed (within certain parameters) but these VFDs will also act as phase converters AND (this is the part that blows my mind) will produce 220V 3PH output from 110V 1PH input.

    Assuming you use the correct size VFD (in my case a 1HP motor on the Bridgeport) are there any downsides to using this 110V 1PH in / 220 3PH out device?

    I was recommended a Lenze VFD.

    (It all sounds too good to be true.)

    I guess it depends on if the variable speed is important. The solid-state converters work fine but the Bridgeport motor will only produce two thirds of its stated horsepower. I have a rotary five horse which is basically a 5 hp three-phase motor with capacitor's so will start on single phase incoming. But the output is a full five horsepower.
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    I run this drill press off a 220 1PH to 220 3PH converter.



    It works great, and I can set any speed at the touch of a button.
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    Quote Originally Posted by lukebarber View Post
    I’ve e been using a static phase converter to run a 220V 3PH lathe for years. No problem with that. Now I have another Bridgeport mill to hook up and I am learning that we now have variable frequency drives that not only let you adjust the motor speed (within certain parameters) but these VFDs will also act as phase converters AND (this is the part that blows my mind) will produce 220V 3PH output from 110V 1PH input.

    Assuming you use the correct size VFD (in my case a 1HP motor on the Bridgeport) are there any downsides to using this 110V 1PH in / 220 3PH out device?

    I was recommended a Lenze VFD.

    (It all sounds too good to be true.)
    Hiya,

    Yup, I run my step pulley on a VFD plugged into a 110v 20A circuit, it works perfect. No real draw backs other than you can't do instant reverse like you can on a direct wired 3PH machine.

    I use a GS2-11p0 from Automation Direct on the Bridgeport and a GS2-23p0 on the Southbend.
    Last edited by tomd999; 04-21-2017 at 07:25 AM. Reason: Updated URL
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    I use a VFD on my Bridgeport mill, Clausing lathe, and belt grinder, would do it any other way!
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    Quote Originally Posted by Kennyd View Post
    I use a VFD on my Bridgeport mill, Clausing lathe, and belt grinder, would do it any other way!
    Are they a 110v single phase step up to 230v 3 phase?
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    The ones I have seen have always been to 220 single phase in. 220 phase out in both the solid-state and the rotary motor. Sounds like this VFD device could be 110 single phase in.
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    Quote Originally Posted by dieselshadow View Post
    Are they a 110v single phase step up to 230v 3 phase?
    No, mine are all 220v input.
    Kenny

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    I run VFD's on my machines. You don't need to use the variable frequencies to alter the motor speed at all, and it's actually easier on the motors if you don't. I just use the soft start and regenerative braking features and have the drives configured to run 60Hz just like 3PH line power would be if it were plugged into the grid. My on/off and forward/reverse switches are wired into the control circuits on the VFD's instead of wired to the power wires to the motors, and the end result is that they work just like they would if you'd plugged it into a 3Ph outlet.

    Rotary phase converters are not rated for full nameplate horsepower. You're only dealing with 2 out of three legs, and the two you have aren't phased properly for the windings in a 3ph motor, so you have 2 legs at 180 instead of 3 at 120 degrees. No matter how hard you jack up that generated leg you aren't going to get true 3Ph power out of those windings. Just ain't possible!
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