Thread: Miller Dynasty 200 DX question

Well, I couldn't resist buying a secondhand Dynasty. It's set up for three phase. My house currently only has 10A single phase (the house supply box has 415V three phase though, for an old bore pump and the main supply). Before I set up either 15A/20A single phase or 10A three phase supply plugs, can I run the machine off 10A? And also if I have to take it anywhere to do welding elsewhere where there is only 10A? Realistic duty cycles before it trips a 10A circuit? I thought for taking it to a 10A supply I could get a pigtail wire that you plug the machine three phase plug into that then plugs into a 10A wall socket.

Obviously I'm not planning on doing any 200A runs from a 10A socket. All of my welding up until now has been on 130A and 140A inverters running off 10A supply, mostly set at 100A or (much) less.

I know there are some users of these machines on here so hopefully some of you have the experience to answer my question.

Before you all jump all over my first paragraph, I might as well head off a few comments by saying that these machines have "Auto-Line technology", which automatically senses and adapts to the supply voltage from 110V single phase to 460V three phase.

One option would be to have a 15A plug fitted and use one of these things from Jaycar:
Portable RCD with 15A to 10A Mains Plug Conversion - Jaycar Electronics

That guarantees you won't pull more than 10A from a 10A socket.

The problem with just putting a 10A plug on it on the basis that you expect to only run it at 100-130A is that the welder may actually routinely exceed the dial setting.

Yeah, I thought of one of those. It's not a bad idea.

It's really just a stop-gap to be able to use the machine while my bank account recovers before I hook up a three phase or 15A or 20A supply. And if I ever have to take it anywhere, which I've never done yet with my stick inverters, but one day I might.

I do need to make up a big box, and 2.0mm - 2.5mm aluminium checker plate would be perfect, so I need to consider the supply issue relatively soon.

Only option without spending too much money is what RustyArc suggests. Use an industrial 15 amp plug, the normal ones would be pretty hard to fit off with the large cable on the dynasty.
Im away this weekend. I could of tested mine with a 10 amp circuit breaker to see what usable amps we get. Can do it next weekend if you like.

That would be great if you remember. I'm done welding for a couple of weeks and need to organise argon etc first anyway.

Originally Posted by Legion

before I hook up a three phase or 15A or 20A supply

I just had a 25mm2 3ph supply installed to my shed. Running 70m from the meter board made it not the cheapest of jobs.

Now have a nice 5 pin 20A socket on the wall.

Just need to find something to plug into it

How expensive?

I have over the years asked sparkies how much for 15A single phase to the shed and it's usually been about $1000 but I've never had anything to justify it.

There are three RCDs in the panel that are all labelled 415V 4.5kA for the bore pump. I'm wondering if I can piggyback off that. I'll never run the two together (I weld outside and running the sprinklers would mean I'd be sitting in the spray while trying to weld) so it's feasible. Sprinklers go on in summer at dawn two or three times a week and are done before I've had breakfast.

I do know a sparky now who does us cheap jobs, might have to see if he's capable of it.

Originally Posted by Legion

How expensive?

The whole job was 70m of 4x25mm2 plus a 16mm2 earth in one conduit for the supply to the shed, and a 2x35mm2 run for the solar panels on the shed in a separate conduit, new board and extra breakers for the shed for 3ph socket, and extra breakers + main switch at the meter board. I dug the trench and ran in the cable and conduit, sparky did the rest. About $4.5k so not cheap - cable and conduit chewed up half of that figure. Not entirely sure if the sparky's time and extra bits really came to $2K.

As for the bore pump, I'm not sure why there'd be RCDs rather than breakers unless it has a socket and plug somewhere. Assuming those are located somewhere useful, I'd guess your sparky should be able to do something - might require a few more switches and breakers though.