Hi guys, I'm looking for some guidance...
My 2-3 year old Sureweld Monomig 152 (Telwin Telmig 161/1), which has seen light, occasional use has packed up
After changing power setting the other day it stopped activating the wire feed when the trigger was pressed and the torch doesn't go live. It has two switches giving four power settings and the remaining two settings worked fine and I finished the job I was doing.
After searching here I decided the switch itself must be faulty to popped the cover off the welder and continuity tested the faulty switch. It seemed ok, but I popped it out, gave it some switch cleaner and worked it a few times. Once replaced (wires on the correct way around!) the welder now doesn't work on any power setting... Same symptoms as before.
There's no signs of overheating or anything inside, but I think the control PCB is probably at fault.
The relay on the PCB clicks when the trigger is pressed, but the 12v output to the wire feed only goes to ~0.25v. On the same plug is a pair of thin wires that go to a weird object mounted behind the transformer. It's some large strips of aluminium with lots of thick, HV wires connected. Thermal cutout?
There's three HV wires going to the PCB, there's mains voltage across two when the relay is open, which swaps to the third when the relay closes (original pair goes to 0v). So I assume the relay works and that power is going to the transformer (I haven't delved too deeply with the unit powered up...).
the relay has a clear casing and there's no arcing from the contacts when it closes, I'm not sure if there should be if it's really powering up the transformer's primary?
Any help would be gratefully received. I'm a bit lost because I've never looked inside a welder before and info on the internet seems a bit sparse. I can't find any websites listing spare parts for this welder either...
My 2-3 year old Sureweld Monomig 152 (Telwin Telmig 161/1), which has seen light, occasional use has packed up
After changing power setting the other day it stopped activating the wire feed when the trigger was pressed and the torch doesn't go live. It has two switches giving four power settings and the remaining two settings worked fine and I finished the job I was doing.
After searching here I decided the switch itself must be faulty to popped the cover off the welder and continuity tested the faulty switch. It seemed ok, but I popped it out, gave it some switch cleaner and worked it a few times. Once replaced (wires on the correct way around!) the welder now doesn't work on any power setting... Same symptoms as before.
There's no signs of overheating or anything inside, but I think the control PCB is probably at fault.
The relay on the PCB clicks when the trigger is pressed, but the 12v output to the wire feed only goes to ~0.25v. On the same plug is a pair of thin wires that go to a weird object mounted behind the transformer. It's some large strips of aluminium with lots of thick, HV wires connected. Thermal cutout?
There's three HV wires going to the PCB, there's mains voltage across two when the relay is open, which swaps to the third when the relay closes (original pair goes to 0v). So I assume the relay works and that power is going to the transformer (I haven't delved too deeply with the unit powered up...).
the relay has a clear casing and there's no arcing from the contacts when it closes, I'm not sure if there should be if it's really powering up the transformer's primary?
Any help would be gratefully received. I'm a bit lost because I've never looked inside a welder before and info on the internet seems a bit sparse. I can't find any websites listing spare parts for this welder either...
