lonewolf454
Member
We are having a strange problem with an AC/DC welder. The welder is being used on dc+ and it is connected to 480V 3PH source. They are trying to weld some chains and using a 3PH trolley chain hoist. The chain is grounded to work terminal of welder. Whenever they try to hook chain hoist into their work it sparks/shocks.
The welder and chain hoist are both on same 480V source.
I have checked hoist and it appears to be ok, no v from hoist to ground, even turned power off to hoist. I tried reversing polarity from welder, since dc goes from - to +, but it still is sparking. Ground (work lead) from welder looks like it's making a good connection on workpiece.
I am not that familiar with dc welders and I hope someone here can shed some light on this phenomena.
The welder and chain hoist are both on same 480V source.
I have checked hoist and it appears to be ok, no v from hoist to ground, even turned power off to hoist. I tried reversing polarity from welder, since dc goes from - to +, but it still is sparking. Ground (work lead) from welder looks like it's making a good connection on workpiece.
I am not that familiar with dc welders and I hope someone here can shed some light on this phenomena.