415V down to 240V

Ch4iS · 8th November 2009, 4:43 PM

Just wondering but can I power a 415V device from 240V?

I will be moving from my factory in January and wanted to know if its possible to wire it to 240V.

It is a cold saw so if I loose half the power I don't think it would be a issue as its geared down something like 40:1

More curious to how its done and what the effects are, can it be wired in parallel to draw double the current and have all the power? "if that makes any sense

"

Fishface · 8th November 2009, 6:49 PM

Your two best options are:

1/ Buy a new motor.

2/ Buy a new saw.

It is possible to run a 3 phase motor on 240V however they need to be hand started.

On a saw that is not a good idea.

-KoMoD0- · 8th November 2009, 6:59 PM

You can do it if you have a fat enough 240v line, 3 phase converters are your friend

Not cheap, but cheaper than getting a new cold saw.

Odje · 8th November 2009, 7:03 PM

What kind of motor is it?

For induction motor, you can get a single phase input to 3 phase output variable speed drive (VSD). Not sure where from. Used industrial plant/factory supplies should have them, else go new.

fabricator · 8th November 2009, 7:16 PM

rewire your new place to add a 3 phase socket. Or if the cable from the street is only single phase the incoming cable and meter box.

Dom. · 8th November 2009, 9:12 PM

what kind of a factory doesn't have 3 phase these days? or at least 3 phase running into your switch board. i would not be in a hurry to move in if you are planing on expanding anytime soon.

2xCPU · 8th November 2009, 9:12 PM

Quote:

Originally Posted by Fishface

It is possible to run a 3 phase motor on 240V however they need to be hand started.

In this case, you wouldn't be able to hand start it (even if you wanted to).
Cold saws use a worm drive reduction box so you can't drive them backwards.

The 'traditional' way of running 3ph from 1ph (before solid state inverters) was to mount two motors back to back.
ie. a 1ph motor plugged into the wall.
- the shaft of the 1ph coupled to a 3ph motor.
- the electrical side of the 3ph motor is your new supply.

A variation of this setup using a 24VDC motor driving a 110VAC 400Hz gen used to be common on aircraft.
They go by the name of Rotary Inverter.

2.

archie · 11th November 2009, 4:13 PM

Quote:

Originally Posted by Odje

What kind of motor is it?

For induction motor, you can get a single phase input to 3 phase output variable speed drive (VSD). Not sure where from. Used industrial plant/factory supplies should have them, else go new.

electrical wholesalers should sell the VSDs.
The likes of John R Turks etc, IPD industrial products.
I know for a fact Salmon Bros electrical sell thems.

Mjollnir · 11th November 2009, 4:58 PM

3 phase VSD can be used on single phase, just need to oversized the rectifier bridge and the DC Bus link capacitors. Actually we offer a specifically designed single to three phase VSD.

Drop me a PM if you need more information and help on the application.

8th November 2009, 4:43 PM	#1
Ch4iS Member Join Date: Jul 2008 Location: OCAU Posts: 724	415V down to 240V Just wondering but can I power a 415V device from 240V? I will be moving from my factory in January and wanted to know if its possible to wire it to 240V. It is a cold saw so if I loose half the power I don't think it would be a issue as its geared down something like 40:1 More curious to how its done and what the effects are, can it be wired in parallel to draw double the current and have all the power? "if that makes any sense "

8th November 2009, 7:03 PM	#4
Odje Member Join Date: Jun 2001 Location: Sydney Posts: 2,277	What kind of motor is it? For induction motor, you can get a single phase input to 3 phase output variable speed drive (VSD). Not sure where from. Used industrial plant/factory supplies should have them, else go new. __________________ FOR SALE: unRAID Server Pro Registration Key $75 There are only 2 reasons why you should run, 1. If you are being chased or 2. If you are on fire

11th November 2009, 4:58 PM	#9
Mjollnir Member Join Date: Apr 2002 Location: Melbourne, VIC3104 Posts: 5,879	3 phase VSD can be used on single phase, just need to oversized the rectifier bridge and the DC Bus link capacitors. Actually we offer a specifically designed single to three phase VSD. Drop me a PM if you need more information and help on the application. __________________ OCAU Extreme Cooling Club H2O / Phase Change Member

8th November 2009, 6:49 PM	#2
Fishface Member Join Date: Mar 2004 Location: Adelaide Posts: 1,593	Your two best options are: 1/ Buy a new motor. 2/ Buy a new saw. It is possible to run a 3 phase motor on 240V however they need to be hand started. On a saw that is not a good idea.

8th November 2009, 6:59 PM	#3
-KoMoD0- Member Join Date: Dec 2005 Location: Western Sydney Posts: 7,718	You can do it if you have a fat enough 240v line, 3 phase converters are your friend Not cheap, but cheaper than getting a new cold saw.

8th November 2009, 9:12 PM	#6
Dom. Member Join Date: Apr 2007 Location: Melbourne Posts: 207	what kind of a factory doesn't have 3 phase these days? or at least 3 phase running into your switch board. i would not be in a hurry to move in if you are planing on expanding anytime soon.