Hi, turned on my trusty mig and no wire feed when pulled the trigger. Performed usual checks and ruled out trigger switch by inserting a loop at Euro connection. Main transformer hums when you manually engage the contactor, Power light dim, starts bright some times then fades. Got multi meter onto it and see the main switch working ok and power to auxiliary power transformer but no out put. removed transformer and no resistance on primary coil (plenty on secondary). Scratching head as if primary is shorted between phase and neutral - why does it not blow the plug fuse? No other fuses that I can see. Wiring layout appears to be same as a Sealey super mig 180 which Dogmatix posted Feb 10 2023.
Took transformer to my electrical engineer mate and he confirmed short in primary but to be sure, hooked it up to a 240 supply and it blew his earth leakage breaker and lights went out - so think I've found the problem.
Hassle is no information on internet from Nutool on spares - only website I could find was Polish and they don't even list this welder (or any older migs) no parts info or wiring diagrams to be had. Nothing written on the transformer itself, about 85mm x 70mm x 90mm in size.
Good picture of it in Richard B 's post April 20 2021 and attached below (top blue transformer - above contactor).
Eddy 49 talks about this transformer in Richard B post Nov 14 2021 and thinks it may be a 240 to 24V AC output.
From looking on internet and asking at my local elecky shop - Electric Centre, it appears to be approx 100VA in size. A Europa CFM-100-CC2 Transformer appears to be about the right thing (dual input either 440V or 240V). RS components may have but dear.
Can anyone confirm if the transformer is 24V AC output (rectified on the board for the feed motor drive). Is there another protection fuse somewhere on this machine (like on the Sealey) as I can't find one that protects either the board or transformer input, or would have blown from this 240V short (not plug as that is OK - still don't know why it did not blow plug fuse but failure may have been a progressive insulation fault and mate's hot wire test was the last straw).
Any help greatly appreciated - also source of cost effective tranny - they seem to list about £75 (welder spares are even dearer for aux transformer) but Ali express has for £20 (long wait). Should be a £10 part (if they can sell a battery charger for £15). (UK parts mark ups are obscene but that's another story).
Many thanks
Took transformer to my electrical engineer mate and he confirmed short in primary but to be sure, hooked it up to a 240 supply and it blew his earth leakage breaker and lights went out - so think I've found the problem.
Hassle is no information on internet from Nutool on spares - only website I could find was Polish and they don't even list this welder (or any older migs) no parts info or wiring diagrams to be had. Nothing written on the transformer itself, about 85mm x 70mm x 90mm in size.
Good picture of it in Richard B 's post April 20 2021 and attached below (top blue transformer - above contactor).
Eddy 49 talks about this transformer in Richard B post Nov 14 2021 and thinks it may be a 240 to 24V AC output.
NU-Tool NW255P Mig Welder Stops working
From looking on internet and asking at my local elecky shop - Electric Centre, it appears to be approx 100VA in size. A Europa CFM-100-CC2 Transformer appears to be about the right thing (dual input either 440V or 240V). RS components may have but dear.
Can anyone confirm if the transformer is 24V AC output (rectified on the board for the feed motor drive). Is there another protection fuse somewhere on this machine (like on the Sealey) as I can't find one that protects either the board or transformer input, or would have blown from this 240V short (not plug as that is OK - still don't know why it did not blow plug fuse but failure may have been a progressive insulation fault and mate's hot wire test was the last straw).
Any help greatly appreciated - also source of cost effective tranny - they seem to list about £75 (welder spares are even dearer for aux transformer) but Ali express has for £20 (long wait). Should be a £10 part (if they can sell a battery charger for £15). (UK parts mark ups are obscene but that's another story).
Many thanks