Finally sussed it out. It was indeed the relay on the PCB after all. I've cleaned the contacts and adjusted the gap and now its getting a good reliable contact it works fine again. I think the reason the contactor was chattering originally was because the PCB relay was chattering due to the...
Thanks Mike. I had the same thoughts. I have 240V into the PCB, and across the relay with the trigger pressed, so the relay looks Ok. But, the output from the PCB is still dead so I am guessing its a component on the PCB after the relay that's died. New PCBs are no longer available but I...
So, the contactor coils are fine across a 240v supply. It' definitely the feed to the coil that's duff. The coil feed wires are a pink wire and a black/brown wire. The pink wire comes off the 1/2 voltage switch centre posts and goes straight to the contactor top coil terminal. The brown/black...
Thanks for the comments. Just to clarify, the contactor went from working Ok to chattering and then to dead. I will post some photos this evening and will double check function of both old and new contrctors off a 240v source.
Thanks for the welcome and for your suggestions! Yes, the contactor is a 240V one, I checked this out right at the start. I will take a look at the contacts in the little relay on the PCB, though i'm not sure that relay can be opened up and fettled. You may well be right that it serves the...
Hi folks. After 30 years of trouble free welding my MIG has finally thrown in the towel! Hopefully someone may be able to give me some pointers. It started with the contactor chattering a bit. On inspection the contacts were badly burned so after studying various threads on this excellent...