Thread: 2 phase 240 volts?

I've got a welder here that requires 2 phase 240 volts, would it be possible to get this to work from a single phase 240V outlet?

I suspect if it genuinely is a 240v 2 phase welder then it will work on single phase 240v. Are u sure it is not 415v? Personally I have never seen 2 phase 240v anything in Australia and suspect it is from the states or somewhere that has 110v single phase.
With a transformer welder generally the voltage is the issue not the requirement for 2 phases. Higher voltage(2 phase) is used to reduce the amperage on the primary winding and hence reduces the size of the copper windings on the primary side of the transformer and the supply cable.

cheers

2 phase is 415 volts between the 2 phases.

Originally Posted by echnidna

2 phase is 415 volts between the 2 phases.

Must Disagree,
There are a multitude of Phase to Phase Voltages.
415V is the one which comes to mind for Australian Domestic Electricians.

For me Phase to Phase is 11KiloVolts
But that doesn't power Welders,
Just Stepdown Transformers.

You need to know exactly what sort of 2 phase it is.
In the bush we are on a SWER line that has a centre tapped 480V secondary.
This gives out 2 phases of 240v each that are exactly 180° out of phase.
You get 480V if you get between the 2 actives.

In a normal city supply, the poly phase supply is 3 phase with each phase 120° out of phase with each other phase.
This will give you 415V between 2 of the actives.

DO YOUR HOMEWORK CAREFULLY.

Power supplied on ships is 240v 2 phase with no earth as are some building sites using transformers to supply power ( for safety reasons ) rather than mains power. I think ( and am reasonably sure that ) you would be fine using normal domestic power of 240v otherwise check the welders manufacturers web page if possable or if they have a contact try that

Originally Posted by Ashore

Power supplied on ships is 240v 2 phase with no earth .....

.... a lot of the Navy boat computer gear that came in for repair was set for 120V including the UPSs.
Maybe it was just the stuff out of the Comm Centre...

Not realy up on what the navy use cliff mabye they have their own dedicated power supply for the important stuff, but us poor travelers in steel the standard Australian power supply is 240v 50 hz , which was a pain if you got anything with a 60 hz clock in it

2 phase was/is 480v, at least in the welding trade.

I am surprised to hear about 480v 2 phase being the standard for welders? Have not worked with them for years but they were all 415v in my day.

Weather single phase , 2 phase or 3 phase the voltage depends on the generator/ alternator producing the power . but 2 phase being 480 volts , not when I was welding ,

Ok, this is what it says in the documents.

Can be run on 240, 415, 480 or 380 input voltages.

Then there is a table with Phase: 2
Cycles (Hz): 50

The input voltage is configured by bridging some terminals.

Will this run on single phase?

Photo Please

To your question.....YES!

Just get the Wiring/connections correct.

Originally Posted by Com_VC

Ok, this is what it says in the documents.

Can be run on 240, 415, 480 or 380 input voltages.

Then there is a table with Phase: 2
Cycles (Hz): 50

The input voltage is configured by bridging some terminals.

Will this run on single phase?

I guess so.

Originally Posted by Brickie

2 phase was/is 480v, at least in the welding trade.

was this the standard al , cause I thought the standard for 2 phase domestic in Australia was /is 415v
Guess there is a double standard in the welding trade too .