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.RC.
08-13-2004, 06:26 AM
I could be getting a 3 phase mill in the near future. It is powered by 415V 3 phase motors.1 for the drive , 1 for the powerfeeds and a coolant pump. I have only 240V single phase here. Upon quering the power company they want $12 000 to run 1 wire 400m and a transformer(our current power comes off a 3 phase line)plus more money to get that power to the workshop. http://bbs.homeshopmachinist.net//frown.gif Way tooooo much.

I under phase converters will convert my 240V to 3 phase but the motors are 415V. How do most people get around the voltage differences.

See Ya

SGW
08-13-2004, 07:03 AM
You'd need a transformer; either a 240-415 3-phase step-up transformer (and I don't know how well a transformer might like the output of a VFD) or a 240-415 single-phase transformer and a VFD for 415V single-phase, which I doubt exists.

If I wuz you I think I'd buy 240V motors. Most likely cheaper.

Or check to see if the existing motors can be rewired for 240V.


[This message has been edited by SGW (edited 08-13-2004).]

wierdscience
08-13-2004, 08:05 AM
Ronk makes a rotary phase converter than not only coverts single to three phase,but also acts as an x-former to provide higher voltage.

sandman2234
08-13-2004, 06:31 PM
Isn't there one on ebay right now? Convert 440 single phase to 440 3 phase. 50 hp
David from jax

3rd time for listing it, or more.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3833364085