Miller Syncrowave 275P 3 Phase Wiring

[Peter Large]

Hi folks,

New to the forum and setting up a small workshop for fabrication projects. I've been welding on a small scratch-start Kempi Minarc and needed something more versatile so I went and got an old Miller Syncrowave 275P.

Had the electrician wire in 3 phase connections. These are 32A sockets with 4pole 2.5mm cable - So L1 (Brown), L2 (Black), L3 (Grey), N (Blue). No earth.

I've been welding on a small scratch-start Kempi Minarc and needed something more versatile so I went and got an old Miller Syncrowave 275P. It was advertised as 3-phase and had a red 4 pin plug attached. Turnout there were only three wires connected to the welder Blue to L1 and Brown to L2, with green/yellow to earth. I set the jumpers for 415V.

So, I now know it's not a 3 phase machine but can run off 415V. So I reckon L1 from welder to L1 from the supply and L2 from the welder to Neutral of the 3 Phase. Ok, what about earth?

Does anyone have any ideas on how I best earth the welder as there is no earth connection on my 3 phase supply? I would like to keep it as portable as possible.

Don't want to mess around with 3 phase so need to fully understand this before attempting anything.

Hope someone can help out... need to get welding!!

Pete

 

[WorkshopChris]

Had the electrician wire in 3 phase connections. These are 32A sockets with 4pole 2.5mm cable - So L1 (Brown), L2 (Black), L3 (Grey), N (Blue). No earth.

That need looking at before you start WHY NO EARTH?

So, I now know it's not a 3 phase machine but can run off 415V. So I reckon L1 from welder to L1 from the supply and L2 from the welder to Neutral of the 3 Phase. Ok, what about earth?

It will probably be L1 ana L2 to give you 415V phase to phase.

You need an electrician with some industrial experience ASAP.

Are your socket 4 pin L1 L2 L3 Earth or 5 Pin L1 L2 L3 N Earth.

An old miller may even have a bigger 63a plug on.
If your electrician used armoured cable then the outer will be the earth but should still connect to the earth terminals.

Maybe some good clear picture if you can get then without endangering yourself.

Where in London are you.

PS.Welcome to the forum.

 

[Peter Large]

Chris,

Thanks for your quick reply. Definitely agree about the electrician.

I'm not going to try anything without getting someone to look at it, but I do want to get my head around it. The cabling is armoured (Didn't think about this being earth but makes perfect sense), I need to have another look to see how this has been wired into the socket and how many pins there are.

I'm not there now but update as soon as I am.

Forest Hill, SE23

 

[WorkshopChris]

Have a look at this post:-
http://www.mig-welding.co.uk/forum/threads/miller-syncrowave-275-s-wiring-and-general-info.19345/

Was just looking at the data book in the pdf link.
If that is the same as your welder you may need a 63a socket with maybe a 10mm feed.
You may getaway with a 32a feed on the lower settings depending on the fusing arrangements.

Any questions just ask.

 

[Peter Large]

Looking at the power consumption panel at the back for 415V, from memory I can use the full DC amperage range on a 32A but above 200A on AC needs a 63A breaker. Pretty useless for Ally then :/

Will get 63A cabling/breaker if this is the case.

I'll double check and post a pic

 

[Peter Large]

Also, the welder came with blanks for where the pulser and electroscope can be. Would like to have these functions as I've been having some use of a Dynasty.

Probably rarer then hens teeth but anyone know of anywhere I could source these? Or any other ideas to build in pulse modulation?

Thanks