Karl Stokes
New Member
- Messages
- 1
- Location
- UK
Just thought i would let all know of a problem i found a while ago as a warning
I was using my inverter AC/DC tig welder, switched over to stick mode and immediately fried my extension lead down the earth core within seconds.
On investigation found out that the output negative was coupled to chassis earth of the welder. And the burn happened because the output ground clamp was sitting on the case of another piece of earthed equipment.
After opening the welder I discovered that a very heavy choke made of large square section copper at the front, was resting hard against the corner of a transformer. It just needed a bit of bending to sort out, and i will eventually insulate it.
Just thought i would put it out here. It's worth checking your machines with a meter to make sure both outputs are isolated from mains input earth. Probably don't have to tell the country of origin of the welder.
Karl
I was using my inverter AC/DC tig welder, switched over to stick mode and immediately fried my extension lead down the earth core within seconds.
On investigation found out that the output negative was coupled to chassis earth of the welder. And the burn happened because the output ground clamp was sitting on the case of another piece of earthed equipment.
After opening the welder I discovered that a very heavy choke made of large square section copper at the front, was resting hard against the corner of a transformer. It just needed a bit of bending to sort out, and i will eventually insulate it.
Just thought i would put it out here. It's worth checking your machines with a meter to make sure both outputs are isolated from mains input earth. Probably don't have to tell the country of origin of the welder.
Karl