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Thread: VFD Conversion

  1. #21
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    Default 5HP single phase VFD? Search in the VFD forum

    Quote Originally Posted by kawboy View Post
    Does anyone make a 5hp VFD that will accept single phase input and output 3 phase?
    If you obtain an OVERSIZED VFD to accomodate the current requirement of the input through only two of the three components, Just about ANY VFD brand will do the job.

    Some recommend a 2:1 oversize ratio, some calculate a bit closer.

    As mentioned, STF!

    I use Toshiba units obtained second hand for similar requirements.

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    Quote Originally Posted by CalG View Post
    If you obtain an OVERSIZED VFD to accomodate the current requirement of the input through only two of the three components, Just about ANY VFD brand will do the job.

    Some recommend a 2:1 oversize ratio, some calculate a bit closer.

    As mentioned, STF!

    I use Toshiba units obtained second hand for similar requirements.

    I can use any VFD and power it from single phase on the line side?
    If I understand this correctly and I need to power a 5hp motor I can buy any 10hp VFD, use single phase input, and connect the 3phase output to the motor?
    Why Toshiba? Just a preference for the way they are laid out for hookup?

    Thank you for the info!!!

  3. #23
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    Polyspeed makes single-phase-only VFDs in a wide variety of capacities, all the way to very high integral horsepower.

    Probably the most proper way to mate a three-phase motor to the back gear unit is to retain the ac motor's 1-1/8" dia. shaft, apply a short extension to that shaft, and to bore a splined input gear to a slip fit on that 1-1/8" shaft.

    In the case of a keyed input gear, the mating shaft is a "special" at 1-1/4", and an ac motor with that size shaft would normally be 7.5 HP.

  4. #24
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    Polyspede


    THANK YOU!!!!!!!

  5. #25
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    Quote Originally Posted by kawboy View Post
    I can use any VFD and power it from single phase on the line side?
    If I understand this correctly and I need to power a 5hp motor I can buy any 10hp VFD, use single phase input, and connect the 3phase output to the motor?
    Why Toshiba? Just a preference for the way they are laid out for hookup?

    Thank you for the info!!!
    Yes, JUST ABOUT ANY 10 hp vfd will power a 5hp motor when fed with single phase from the mains (of the correct voltage!)

    But Please, search the forum, there is so much information there.

    Why Toshibas? I got the first one inexpensivly, put the time into learning how to set it up etc, then when the second and third came along, at even better value, I followed the path of small resistance ;-) They seem to be well designed and built. Many useful features. I do have a couple other brands on tools as well, they all work very similarly.

    There ARE units that will fault on loss of line however . At least I have heard as much. I do not know which brands , nor if those same units can be programmed to over ride the fault.
    Those would be the exception to the "all" rule. ;-)

    You might be able to accomplish the same thing as the polyspeed for less money or more convenience. That is why I mention it. Read the forum.. Very common practice..

    cheers

    Cal

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    Again thank you Cal! Just buy a 10hp VFD and hook into L1 L2 to get 3 phase output!...I had no idea.
    Will explore this thread further.

  7. #27
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    Anyone have a left over splined 32 tooth 16 DP 14-1/2 deg PA gear for sale? Or trade for a 1 1/4 keyed version? I have the 1 1/4 keyed version, but the shaft on the 7.5 hp motor I have for the conversion is 1 1/8. I would prefer to just get a splined gear and bore it over other options. Thanks!


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