Welder supply

tippgod

Hi, I am looking to settle an argument with my brother.

I have a 3 phase welder. On the inside, there is setting where if you change around plates that it can change from 400v to 220v.

I think that this means from 400v 3 phase to 220v 3 phase but he is telling me that i can wire the welder up to 220v single phase .

Is he correct

2011

Depends on the welder.

tippgod

2011 wrote: »

Depends on the welder.

Its an old telwin supermig 360. I have no manual for it but found specs online,. It says 3ph 400v/220v

Sir Arthur Daley

tippgod wrote: »

I think that this means from 400v 3 phase to 220v 3 phase but he is telling me that i can wire the welder up to 220v single phase .

You are correct, your brother is incorrect.

tomdempsey200

I'd say the brother is prob correct

I'd say they take 230 1 phase or 400v 2 phase
(not actual 3 phase)... it's common on welders to use that terminology afaik

how many wires on mains lead

dual voltage motors are interchangeable alright between 3P 230v and 3P 400v supplies

tippgod

tomdempsey200 wrote: »

I'd say the brother is prob correct

I'd say they take 230 1 phase or 400v 2 phase
(not actual 3 phase)... it's common on welders to use that terminology afaik

how many wires on mains lead

dual voltage motors are interchangeable alright between 3P 230v and 3P 400v supplies

4 wires, brown, black and grey. Those 3 wires go into a grid that if turned one way it just says 400v and the other way 220v. Then the 3 wires go into a contractor then onto a rotary switch which is selecting the input into the transformer.
I have tried looking up for a manual on either telwin or sealey website

tomdempsey200

I must be mistaken then.

brown black grey is 3P

must be 3P dual voltage

it's common on the smaller welders to be 230 or 380 (over 1 or 2 phases) and they call it 3 phase

Bruthal

tomdempsey200 wrote: »

I'd say the brother is prob correct

I'd say they take 230 1 phase or 400v 2 phase
(not actual 3 phase)... it's common on welders to use that terminology afaik

how many wires on mains lead

dual voltage motors are interchangeable alright between 3P 230v and 3P 400v supplies

A 3 phase motor with 230v windings can be connected to 400v 3 phase. And so can a motor with 400v windings obviously enough.

I think the particular welder here is 3 phase in either 230 or 400

tomdempsey200

Bruthal wrote: »

A 3 phase motor with 230v windings can be connected to 400v 3 phase. And so can a motor with 400v windings obviously enough.

I think the particular welder here is 3 phase in either 230 or 400

yes.. not relevant here but

trafos with a single 400v primary winding are commonly referred to as 3 phase trafos

same with the smaller 400v welders that run off 230V or 2 phases

I found it confusing at first

Bruthal

tomdempsey200 wrote: »

yes.. not relevant here but

trafos with a single 400v primary winding are commonly referred to as 3 phase trafos

same with the smaller 400v welders that run off 230V or 2 phases

I found it confusing at first

Ye I know. Even though an item supplied off 2 phases might be referred to as a 2 phase or even a 3 phase item, it is purely a single phase item. Once there is only 2 phases, there is only a single sine wave, exactly as from phase to neutral, but higher magnitude.

If the welder only has a single winding, then it is a single phase welder alright, even though it might have a 3 phase lead to it. Need an oul diagram.

tomdempsey200

it's common with the smaller trafos and welders(single winding) to have the option of 230 or 400

the 400 keeps a better balance on supply if 3P is available and smaller supply cables and VD

Bruthal

Yea overall, it probably is a single phase dual voltage welder. The output is only 2 pole which only needs a single winding.