Fronius VarioSynergic 3400 Instructions De Service page 64

Hazards from
mains and weld-
ing current
(continued)
Stray welding
currents
ud_fr_st_sv_00467 012005
If the machine is run on a mains network without a PE conductor and
plugged into a power outlet socket without a protective-conductor contact,
this counts as gross negligence and the manufacturer shall not be liable for
any resulting damage.
Wherever necessary, use suitable measures to ensure that the workpiece is
sufficiently grounded (earthed).
Switch off any appliances that are not in use.
When working at great heights, wear a safety harness.
Before doing any work on the machine, switch it off and unplug it from the
mains.
Put up a clearly legible and easy-to-understand warning sign to stop anybody
inadvertently plugging the machine back into the mains and switching it back
on again.
After opening up the machine:
- discharge any components that may be storing an electrical charge
- ensure that all machine components are electrically dead.
If work needs to be performed on any live parts, there must be a second
person on hand to immediately switch off the machine at the main switch in
an emergency.
If the following instructions are ignored, stray welding currents may occur.
These can cause:
- fires
- overheating of components that are connected to the workpiece
- destruction of PE conductors
- damage to the machine and other electrical equipment
Ensure that the workpiece clamp is tightly connected to the workpiece.
Attach the workpiece clamp as close as possible to the area to be welded.
On electrically conductive floors, the machine must be set up in such a way
that it is sufficiently insulated from the floor.
When using current supply distributors, twin head wire feeder fixtures etc.,
please note the following: The electrode on the unused welding torch/welding
tongs is also current carrying. Please ensure that there is sufficient insula-
ting storage for the unused welding torch/tongs.
VI