Except that he needs a 5 hp single phase inverter. Those are a little
harder to find and a lot more expensive... near $1000 for this AC Tech
Drive.
https://www.wolfautomation.com/products/ac-drives/ac-drive-5hp-208-240vac-1-3-phase-input
Phase converters do have some phase current balance issues but for low
tech - I just want to run the machine - they are hard to beat unless you
are running the machine a lot or at a constant full load. I have a
rotary phase converter built with a 10hp motor 15+ years ago and it will
power a 10 hp Quincy two stage air compressor at slightly reduced
pressure. I probably put about $250 into that phase converter 15 years
ago. Good motor run caps are the key. Those can be bought off Ebay
and Surplus Center, etc.
There is a small down the road that manufactures steel stakes for the
Army Corp of engineers and landscape contractors in large quantities and
he has an assortment of small punch presses and the entire shop runs off
single phase power with a phase converter. So it can be done.
Sometimes low tech is enough and if you don't need variable speed it can
work well.
Dave
On 1/1/2018 7:58 PM, Gregg Eshelman via Emc-users wrote:
Or just get a proper single phase to three phase VFD and do the job right. For
under $200 you can get a 230V 1PH in drive that'll run up to a 3HP 3PH
https://www.wolfautomation.com/products/ac-drives
On Monday, January 1, 2018, 10:49:12 AM MST, John Figie
<[email protected]> wrote:
All,
Thanks for your replies.
My real question was to see if anyone had used GOHZ or some other cheap
drive. I currently run all my machines from a home made rotary phase
converter. It works pretty well but does not produce the best 3 phase.
Yes I know you can use capacitors to adjust the outputs which I have. The
rotary converter has been running in my shop for about 15 years. I have a
hydraulic automatic surface grinder that does n't like being run from the
phase converter. The pump motor overheats when run from my rotary
converter, I think maybe this is because the motor runs near full load.
I know I can use a larger drive and derate it to use on single phase power,
but that seems like a much more expensive option.<clip>
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