The_Motorcyclist
Member
- Messages
- 39
- Location
- Cambridgeshire UK
Hi all.
I recently got my mitts on a BOC transmig 140 mig welder. The thing almost works but with a rather curious issue that I’m hoping some bright spark on this forum can help me with.
When the trigger is pulled, the wire feed starts up and the small relay on the PCB pulls in, I’m fairly sure this runs the wire feed motor.
The main contactor however will not engage, there are no volts coming from the PCB to energise it. When the main contactor is pushed in manually it retains in, i.e. voltage is on the coil allowing the arc to be struck, but remains in regardless of whether the trigger is pulled or not. The wire feed still stops and starts with the trigger as normal. Curiously the main contactor is a 24V AC coil. In other threads, others have mentioned that this should be 24V DC, it seems strange that other welders mentioned on here have also been fitted with the 24V AC contactor and been advised that is wrong.
It looks like someone has been playing in there recently, the PCB was also repaired in May by the eBay guy. I’ve messaged them for advice but as yet no response.
Any help greatly appreciated.
I recently got my mitts on a BOC transmig 140 mig welder. The thing almost works but with a rather curious issue that I’m hoping some bright spark on this forum can help me with.
When the trigger is pulled, the wire feed starts up and the small relay on the PCB pulls in, I’m fairly sure this runs the wire feed motor.
The main contactor however will not engage, there are no volts coming from the PCB to energise it. When the main contactor is pushed in manually it retains in, i.e. voltage is on the coil allowing the arc to be struck, but remains in regardless of whether the trigger is pulled or not. The wire feed still stops and starts with the trigger as normal. Curiously the main contactor is a 24V AC coil. In other threads, others have mentioned that this should be 24V DC, it seems strange that other welders mentioned on here have also been fitted with the 24V AC contactor and been advised that is wrong.
It looks like someone has been playing in there recently, the PCB was also repaired in May by the eBay guy. I’ve messaged them for advice but as yet no response.
Any help greatly appreciated.