Hello guys,
I have 2006 CNC 3 axis Bridgeport/Harndinge EZ Vision Mill.
My machine is wired for 3 phase 460 volts.
2.0 KW
3.3 amps and 1.1 Spindle amps
My question,
I only have single phase 240 coming in the shop.
I also have a used SEW Eurodrive VFD. http://www.clrwtr.com/PDF/SEW-Eurodrive ... atalog.pdf
What kind of transformer do you guys recommend to boost the volts from 240 to 460? Installed before or after transformer?
Transformer help
Moderator: Team
-
- Member
- Posts: 176
- Joined: Fri Nov 27, 2009 8:22 pm
- Location: Roanoke Rapids, NC
Re: Transformer help
I had to do something similar for my CK-21. I went single phase 230 to a rotary phase converter to create three phase 230 and then from that to an Acme transformer to create the 460 three phase power. Do a google search for Acme Transformers in Lumberton, NC. Call their engineering group and tell them the info and they can make sure you get the right equipment. They are very helpful.
Christopher Racing Engines
Roanoke Rapids, NC 27870
252-578-8273
Roanoke Rapids, NC 27870
252-578-8273
-
- Expert
- Posts: 976
- Joined: Sat Oct 27, 2007 4:53 am
- Location: Yorkville, Illinois (60 miles SW of Chicago)
Re: Transformer help
I've always considered having 3 phase installed if I ever build a house. Less $$ to run the A/C and well pump.
-
- Guru
- Posts: 4270
- Joined: Sat Sep 03, 2016 9:03 pm
Re: Transformer help
What did you finally do? The VFD drive looks to me the Model #3 is not large enough and or borderline? I have never checked but do they make rotary step up convertors? I don't believe so. I also wonder how sensitive the CNC electronics are to use of a rotary converter. Is this a daily often used piece of equipment? May want to get a small 15KW? 3 Phase diesel genset that has 480 V capibility or iuse a transforner, or whatever size needed for facility emergency back up, and use that until a better solution presents itself.
-
- Pro
- Posts: 431
- Joined: Thu Mar 21, 2013 12:03 pm
- Location: Chancellorsville Battle Field, Chancellorsville, Virginia
Re: Transformer help
Are the motors set up with low voltage wiring (dual voltage)? With 460 volts the current is 4.5 amps. With ''house voltage'' (usually 240 VAC) the current would be around 9 amps and that is not taxing. Now I'm not sure about CNC electronics, but as far as powering up, I would look into a rotary 3 phase converter (you have to have 3 phase). I made one from a 3 hp, 3 phase 230/ 460 VAC motor and several lighting capacitors years ago and wired it for low voltage. It works great and powers up 2 small lathes and 1 small mill. Three phase motors usually come dual voltage. I would not go the expense of an additional piece of equipment (step-up transformer).
-
- Pro
- Posts: 400
- Joined: Fri Apr 15, 2005 8:21 am
- Location: Indiana
Re: Transformer help
On 480v 3~ motors there is usually a diagram showing the pigtail configurations for different voltages. If there is not a diagram, an electric motor shop can reconfigure it for you. I had a motor on my milling machine that did not appear to have any pigtails to change it from 480v 3~ to 240v 3~. I took it to the local electrical shop and they pulled leads out somehow to make it work, and they only charged me a small fee. It was over 20 years ago and I'm a little bit fuzzy on the details. I'm still running my mill with the same motor.
Jim McMahon
Heads1st
http://www.heads1st.com/
Heads1st
http://www.heads1st.com/
-
- Guru
- Posts: 1493
- Joined: Wed Jun 22, 2005 6:25 pm
- Location: Box Elder, SD
Re: Transformer help
Realize this is an old post and you probably have the machine going by now. Going to suggest looking at a Siemens control. I know they are able to convert three from single phase. Think they also have a step up or down feature too. Hitachi makes a similar unit and may be others too. A buddy said he converted a machine that way and said the converter was cheap on Fleabay.
Monty Frerichs
B&M Machine
B&M Machine
-
- Guru
- Posts: 1298
- Joined: Sun Mar 01, 2009 2:42 am