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Thread: Balancing rotary phase converter to run three phase VFD.

  1. #51
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    Re: Balancing rotary phase converter to run three phase VFD.

    Thank you for photo.

    They are using a timer to turn off the starting capacitors after a few seconds.
    Witch replaces the starting relay but dose the same job of after the converter

    Dave

    Quote Originally Posted by Oscar View Post









  2. #52
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    Re: Balancing rotary phase converter to run three phase VFD.

    Quote Originally Posted by smithdoor View Post
    I tried to keep all single phase and only used the phase converter when need.

    It makes life simple just flip a switch.

    Dave
    That;s fine but old transformer 3 phase stuff is excellent welding machines over most single phase tranny units. It when I want to run dual shield out of my LN-25 pro, so not running it all that much.. Just when needed. I had pretty much most single phase standard type,also Choppers from Esab/Lincoln, and Miller. Inverters from many places, and all I have left now. Just want one quality tough as nails 3 phase Transformer unit..Running off my phase converter. $250 for the multi $1000.00 unit will force me to upgrade my rotary's output..
    Esab/Lorch ET-220i
    Esab 160i caddy
    Esab CV353
    Thermal LM-200/ Lincoln feeders
    Thermal 60i- 3phase
    Pak 50
    Thermal 35C
    Thermal 15c
    INE 1500
    Klutch 220i
    Blue Demon/140 msi/90sti

  3. #53
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    Re: Balancing rotary phase converter to run three phase VFD.

    Find a start wound motor and switch on after phase converter has started will boost the power.

    Dave

    Quote Originally Posted by Brand X View Post
    That;s fine but old transformer 3 phase stuff is excellent welding machines over most single phase tranny units. It when I want to run dual shield out of my LN-25 pro, so not running it all that much.. Just when needed. I had pretty much most single phase standard type,also Choppers from Esab/Lincoln, and Miller. Inverters from many places, and all I have left now. Just want one quality tough as nails 3 phase Transformer unit..Running off my phase converter. $250 for the multi $1000.00 unit will force me to upgrade my rotary's output..

  4. #54
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    Re: Balancing rotary phase converter to run three phase VFD.

    Exactly, like my mill does now.. Just want a larger motor, and a switchable run caps to balance the twin motors out somewhat..That is the versatile part of this way of doing things.. No one large motor to start makes for a easier time to get things going.. Really need nothing more then I have now, and is sweet running the 60i at full tilt.
    Esab/Lorch ET-220i
    Esab 160i caddy
    Esab CV353
    Thermal LM-200/ Lincoln feeders
    Thermal 60i- 3phase
    Pak 50
    Thermal 35C
    Thermal 15c
    INE 1500
    Klutch 220i
    Blue Demon/140 msi/90sti

  5. #55
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    Re: Balancing rotary phase converter to run three phase VFD.

    A three phase running on single phase and no converter and no capacitors has 60% power but running at the same speed.
    Adding a motor and or capacitors will bring the power 100%.
    But most machine tools never use more than 30% power. A drill press will use 100% and welders need balancing for the DC power.

    Dave

    Quote Originally Posted by Brand X View Post
    Exactly, like my mill does now.. Just want a larger motor, and a switchable run caps to balance the twin motors out somewhat..That is the versatile part of this way of doing things.. No one large motor to start makes for a easier time to get things going.. Really need nothing more then I have now, and is sweet running the 60i at full tilt.

  6. #56
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    Re: Balancing rotary phase converter to run three phase VFD.

    Oscar, are the run caps on the left and start caps on the right?

  7. #57
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    Re: Balancing rotary phase converter to run three phase VFD.

    Yes

    Dave

    Quote Originally Posted by forhire View Post
    Oscar, are the run caps on the left and start caps on the right?

  8. #58
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    Re: Balancing rotary phase converter to run three phase VFD.

    I honestly have not looked into it as much as I should, so I honestly cannot answer with certainty. I'll let others chime in on that.
    1st on WeldingWeb to have a scrolling sig!



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