Chris Harkness
New Member
- Messages
- 1
- Location
- North east england
Hi guys. First timer.
I am electrically trained and looking at a serious mig welder issue affecting about 6 or 7 sets a day. Many people trying have come and gone ants its driving everyone nuts. Any advice or help would be greatly appreciated.
The 400a sets have two 1.25a control fuses which supply the main onboard control transformer. This powers the cooling fan at 230v and the digital panel display and torch controls.
One of the control fuses blow and when looking an arc has taken place between the phase conductor and earth. Its not only jumping huge air gaps but also destroying plastic insulation on any switches, fuse carriers etc. Put a new 1.25a fuse in machine operates fine.
Is it possible an induced voltage is back feeding through the low voltage side of the transformer via the welding side of things? Hence the transformer is working backwards making the incoming phase wiring voltage big enough to arc to earth as the fuse then is completely obliterated trying to break a huge current? This is happening on numerous differant sets every day.
Any clever people out there who may have seen this before?
Many thanks
I am electrically trained and looking at a serious mig welder issue affecting about 6 or 7 sets a day. Many people trying have come and gone ants its driving everyone nuts. Any advice or help would be greatly appreciated.
The 400a sets have two 1.25a control fuses which supply the main onboard control transformer. This powers the cooling fan at 230v and the digital panel display and torch controls.
One of the control fuses blow and when looking an arc has taken place between the phase conductor and earth. Its not only jumping huge air gaps but also destroying plastic insulation on any switches, fuse carriers etc. Put a new 1.25a fuse in machine operates fine.
Is it possible an induced voltage is back feeding through the low voltage side of the transformer via the welding side of things? Hence the transformer is working backwards making the incoming phase wiring voltage big enough to arc to earth as the fuse then is completely obliterated trying to break a huge current? This is happening on numerous differant sets every day.
Any clever people out there who may have seen this before?
Many thanks