Hi,
New guy here - hope you'll forgive me introducing myself with a request for help.
I have an old Multi-Mig (sorry to post in the Lincoln forum; there doesn't appear to be a section for obscure and awkward welders... or their equipment).
It has two dials for power settings - a coarse dial with two ranges, and a fine dial with six. In the lower range, the welder works as expected on all six settings. In the upper range, there is no voltage at the torch. I can't figure out what is going on. Can anyone offer any advice?
So far:
- The PCB relay clicks as it should when the trigger is pulled
- The main contactor closes
- It feeds wire
- No arc.
Inside, it has a big transformer; this consists of a big laminated transformer-iron ring with two sets of coils on it. Each set of coils consists of a primary 240v winding, overwound with an output winding. There are six wires going into the primary on one of the coils, and five going into the primary on the other.
I'm struggling to understand how the two range selectors work together. There don't appear to be any big resistors or similar that might throttle the input voltage down in the lower range, so I'm not sure how it reduces power.
Any advice would be most gratefully received.
New guy here - hope you'll forgive me introducing myself with a request for help.
I have an old Multi-Mig (sorry to post in the Lincoln forum; there doesn't appear to be a section for obscure and awkward welders... or their equipment).
It has two dials for power settings - a coarse dial with two ranges, and a fine dial with six. In the lower range, the welder works as expected on all six settings. In the upper range, there is no voltage at the torch. I can't figure out what is going on. Can anyone offer any advice?
So far:
- The PCB relay clicks as it should when the trigger is pulled
- The main contactor closes
- It feeds wire
- No arc.
Inside, it has a big transformer; this consists of a big laminated transformer-iron ring with two sets of coils on it. Each set of coils consists of a primary 240v winding, overwound with an output winding. There are six wires going into the primary on one of the coils, and five going into the primary on the other.
I'm struggling to understand how the two range selectors work together. There don't appear to be any big resistors or similar that might throttle the input voltage down in the lower range, so I'm not sure how it reduces power.
Any advice would be most gratefully received.