Balancing rotary phase converter to run three phase VFD.

[smithdoor]

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

[Brand X]

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..

[smithdoor]

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

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..

[Brand X]

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.

[smithdoor]

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

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.

[forhire]

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

[smithdoor]

Yes

Dave

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

[Oscar]

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.