Hi,
The earth clamp on my 90a sip mig welder has broken, what size in terms of amps do I need for a replacement they seem to range from about 200a to 500a
Thanks
Chris
finally this is fixed and working correctly,
I removed the transformer, gently sanded back the coating on the windings enough to allow me to connect a screw terminal to them and then a wire from the other side to the spade tag with this completed on all 3 tags the arc now strikes with no...
ok then, we can forget trying to refit the other pcb, I manage to feed 240v into it and it went bang so that's that.
The scr on the original pcb seems to test fine but what I have found is on the bottom of the pcb there are 2 zener diodes, the one with the blue stripe shows open circuit when...
Hi Eddie, so had another look at it and I think I must be missing something,
If I understand you correctly to refit the other pcb with the pot in the first set of pictures I need to do the following,
Take pin 2 of the original pcb to the input + of the other board,
Take pin 5 of the original...
Top marks to Alan, wiggling the current switches back and forth has brought it back to life, next I'm going to look into stripping and cleaning all the connections as everything does look a bit nasty in there, I'm also going to look into replacing the wire feed pot as the one fitted isn't...
Thanks Eddie, there is a component on the board marked scr1 looks a bit like a 3 legged fet I'll see if I can get some more details off it it tomorrow and find a way of testing it
Chris
Hi Dom,
the potentiometer works fine I checked it before I made the post, I've ordered another transformer anyway as there cheap enough. I'll check the relay fully and take a closer look at the bit mounted to the heatsink when I get 5 minutes
Thanks
Chris
Well it seems I'm having more issues, no doubt something i've done.
Firstly occasionally when starting the arc you get the above sparking in the bottom of the unit, it appears to be from one of the connections to the transformer, is this normal, is it just a case of needing to clean up the...
Hi All,
The last time I used my SIP handymig the wire feed stopped working, as I needed to finish the job I was doing I went and bought a different welder and this has sat in the corner of my garage waiting for me to do something with it.
I've stripped the cases off it to have a look, when the...
Finally had time to look at this today, both the new relay and transformer were direct fit replacements.
With the new components fitted and the output to the wire feed motor rewired back to the original pcb everything now seems to work as it should I'll know better when I eventually set up a...
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F312796458359
Any reason I can't use the above as it has a higher rating than the original?
Currently thinking to remove the wire speed pot from the board and mount the board separately on stand off posts with...
Thanks for the responses guys, Eddie what you've said sounds very much like the case for what's happened, I assume the transformer is the big square lump in the middle of pic 3?
From reading old threads in this forum it appears the relay and white resistor in pic 3 are also known to fail so I...
Hi Folks,
first post here looking for some help with my Sealey Supermig 150. I bought it second hand a couple of years ago and at the time the seller mentioned the inverter had failed so he replaced it, no problem the welder worked when he demonstrated it so I bought it, when I got it home I...