1ph 240- 3ph 575

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RIFF-RAFF

Plastic

Joined

Mar 26, 2009

Location

Burlington,Ontario,Canada

• May 4, 2009

• #1

I recently purchased an Ex-cell-o mill that uses a 2hp 575v motor and I only have 1ph 240 power.Can anyone provide me with the best means of converting my 1ph 240 to 3ph 575?Would this VFD ( http://www.driveswarehouse.com/Drives/AC+Drives/Variable+Torque+VFD/X200-022NFU.html ) do the trick and then bump up the voltage with a transformer or should I bump up the voltage first then through a VFD?What VFD should I use and what transformer?Thanks for any help.

Frank

 

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DDoug

Diamond

Joined

Oct 18, 2005

Location

NW Pa

• May 4, 2009

• #2

Do you need/want the variable speed that the V.F.D. provides ?

If not here is a discussion on using a rotary and a xformer.

http://www.practicalmachinist.com/vb/showthread.php?t=177756

 

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RIFF-RAFF

Plastic

Joined

Mar 26, 2009

Location

Burlington,Ontario,Canada

• May 5, 2009

• #3

digger doug said:

Do you need/want the variable speed that the V.F.D. provides ?

If not here is a discussion on using a rotary and a xformer.

http://www.practicalmachinist.com/vb/showthread.php?t=177756

Click to expand...

I read that thread you mentioned but found nothing on rotary phase converters.Also,that thread was about going from 240 3ph to 460 3 phase where no phase converter is needed.I need to go from 240 1ph to 575 3ph.Can anyone help out a newb?Thanks.

Frank

 

D

DDoug

Diamond

Joined

Oct 18, 2005

Location

NW Pa

• May 5, 2009

• #4

"I read that thread you mentioned but found nothing on rotary phase converters.Also,that thread was about going from 240 3ph to 460 3 phase where no phase converter is needed"

Uhm, I was sure it covered it, could be wrong though...

The debate was over changing it up to 440-460 as 1-phase, and then
either using a VFD or a rotary at that point, OR making 3-phase at
220-240 with a rotary and then using a xformer to step it up to 440-460.

You'll note my comments are that I step up to both 440-460 AND 575-600.

I actually do 440-460 in one shop for a jig bore, 575 in another shop
for a radial drill, and the latest is 575 in another bay for a lathe.
(all 3 separate transformers)

Yes the waters got muddyed by other factors like how to use 2 single phase
xformers, and "y" and delta windings, and passing thru grounds and such.

 

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stephen thomas

Diamond

Joined

Jun 3, 2001

Location

downhill from Twain\'s study outside Elmira, NY

• May 5, 2009

• #5

I went through this last year. I don't much need or want to afford VFD's for most of my machines, and already have the homemade 3ph convertor for the shop. Here is my experience with using a transformer to get to 550 - 575v from ~230V single phase input.

Many people think a buck boost transformer would be a better solution. It might be. but my system works fine for me, 15HP total available motors, though most likely seldom more than 5HP +/- in use at any one time with only me running the machine. I use it for production work, so it has to be reliable. As noted in the article, it is somewhat under voltage under load, but no downsides for my work. (The fact that undervoltage is not a "problem" if one does not need the full rated HP has been discussed many times in the past on PM).

Anyway, use good judgement & safe practices, consider other opinions, and make your own choice. My cheap approach is reliable and works for me.

http://owwm.org/viewtopic.php?t=34446&postdays=0&postorder=asc&highlight=transformer&start=15

smt

 

M

MwTech Inc

Titanium

Joined

Feb 6, 2005

Location

Fishersville VA

• May 6, 2009

• #6

Can the motor be changed?
Might be easier to make an adapter then mess with all the electrics?

 

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RIFF-RAFF

Plastic

Joined

Mar 26, 2009

Location

Burlington,Ontario,Canada

• May 7, 2009

• #7

Being that this mill uses a very unique motor,I've decided to have it rewound to 230v 3ph and just a use a VFD to convert my 230 1ph to 230 3ph and eliminate the need for a transformer.

Frank

MwTech Inc said:

Can the motor be changed?
Might be easier to make an adapter then mess with all the electrics?

Click to expand...

 

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SBAER

Hot Rolled

Joined

Aug 21, 2006

Location

Kitchener, on canada

• May 17, 2009

• #8

If you want a 575V vfd and a transformer to go with it (to get the single phase 575V)I can set you up for $550 for both. I am in Kitchener. I have this arrangement on many machines in my shop.

[email protected]

 

R

RIFF-RAFF

Plastic

Joined

Mar 26, 2009

Location

Burlington,Ontario,Canada

• May 18, 2009

• #9

SBAER said:

If you want a 575V vfd and a transformer to go with it (to get the single phase 575V)I can set you up for $550 for both. I am in Kitchener. I have this arrangement on many machines in my shop.

[email protected]

Click to expand...

Heya Stan,

I've spoken to you before about that setup you mentioned (answered your Kijiji ad).I figured I could get my motor rewound for 230 3ph and eliminate the need for a transformer for around $50-$100 more.

Frank

 

S

SBAER

Hot Rolled

Joined

Aug 21, 2006

Location

Kitchener, on canada

• May 20, 2009

• #10

My experience with motor rewinding is that it is not cheap. If you find someone who will rewind it for less than $300 let me know, I could use his services on occasion.

 

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RIFF-RAFF

Plastic

Joined

Mar 26, 2009

Location

Burlington,Ontario,Canada

• May 21, 2009

• #11

SBAER said:

My experience with motor rewinding is that it is not cheap. If you find someone who will rewind it for less than $300 let me know, I could use his services on occasion.

Click to expand...

I shopped around and so far prices ranged anywhere from $800 plus down to $350.All the quotes I received included all new bearings as well.

Frank

 

misterT

Cast Iron

Joined

Mar 10, 2009

Location

Indiana USA

• Jun 8, 2009

• #12

I am building a homemade phase convertor myself.I would like to know how Stephen Thomas determined the values for the balancing capacitors. Was there a method to your madness or was it just trial and error untill you got it right?