Bill Edwards
Member
- Messages
- 4,959
- Location
- Scarborough, North Yorkshire
Following on from my recent thread (http://www.mig-welding.co.uk/forum/threads/unknown-mig-wire-feed-units.46678/) on two MIG wire feed units I've tested them with little success and need to delve into the wiring.
The plan is to use one of these feed units with a Sealey Supermig 150 to give a reasonable welder with a good, 4 roller wire feed, 4m Eurotorch, inbuilt flow meter and any other benefits.
I've taken the covers off to reveal the electrics. I tried plugging in the one with a 110v socket and the unit was dead. When I investigated I found the 110v power connected to a large transformer (pictured) which dropped it to 40v, which then went to a plug on the rear of the welder (pictured) and nothing more.
The plug with a 40v supply from the transformer:
Thinking about it I suspect that I've actually had it the wrong way round - the small plug shown must be the input, with the 110v socket being the output (but for what?).
Anyway, it probably isn't relevant and the second unit is very similar but without that system.
I don't think I'll be able to just wire the wire feed motor to the supply from the Sealey as even if the voltages are the same I doubt if the Sealey could supply enough current. Finding a separate 42v supply isn't likely to be practical.
However, I noticed this smaller transformer fitted to both units:
Which connects to:
Presumably this is a 12v supply that goes through a rectifier to supply the main circuits for the wire feed speed control, gas supply etc? If so I could probably get a 12v DC supply hooked up in its place.
However, the wire feed motor may be harder:
It takes 42v.
A few more pictures:
So, any thoughts on how this unit works as I can't see any chances of obtaining circuit diagrams for it?
How can I get it to feed wire, ideally controlled by the unit itself as this ought to be a decent system if I can get it all powered up?
The plan is to use one of these feed units with a Sealey Supermig 150 to give a reasonable welder with a good, 4 roller wire feed, 4m Eurotorch, inbuilt flow meter and any other benefits.
I've taken the covers off to reveal the electrics. I tried plugging in the one with a 110v socket and the unit was dead. When I investigated I found the 110v power connected to a large transformer (pictured) which dropped it to 40v, which then went to a plug on the rear of the welder (pictured) and nothing more.
The plug with a 40v supply from the transformer:
Thinking about it I suspect that I've actually had it the wrong way round - the small plug shown must be the input, with the 110v socket being the output (but for what?).
Anyway, it probably isn't relevant and the second unit is very similar but without that system.
I don't think I'll be able to just wire the wire feed motor to the supply from the Sealey as even if the voltages are the same I doubt if the Sealey could supply enough current. Finding a separate 42v supply isn't likely to be practical.
However, I noticed this smaller transformer fitted to both units:
Which connects to:
Presumably this is a 12v supply that goes through a rectifier to supply the main circuits for the wire feed speed control, gas supply etc? If so I could probably get a 12v DC supply hooked up in its place.
However, the wire feed motor may be harder:
It takes 42v.
A few more pictures:
So, any thoughts on how this unit works as I can't see any chances of obtaining circuit diagrams for it?
How can I get it to feed wire, ideally controlled by the unit itself as this ought to be a decent system if I can get it all powered up?