Stray welding
currents
If the following instructions are not observed, stray welding currents may occur,
which pose a risk of the following:
-
Fire
-
Overheating of parts connected to the workpiece
-
Irreparable damage to ground conductors
-
Damage to the device and other electrical equipment
Ensure that the workpiece clamp is securely connected to the workpiece.
Secure the workpiece clamp as close to the spot to be welded as possible.
Position the device with sufficient insulation against electrically conductive envir-
onments, e.g., insulation against electrically conductive floors or electrically con-
ductive mounts.
Observe the following when using power distribution boards, twin-head mounts,
etc.: Even the electrode of the welding torch/electrode holder not in use carries
electric potential. Ensure that there is sufficient insulation when the unused
welding torch/electrode holder is stored.
In automated MIG/MAG applications, only guide the wire electrode from the
welding wire drum, large spool, or wirespool to the wirefeeder with insulation.
EMC Device
Classifications
Devices in emission class A:
-
Are only designed for use in industrial settings
-
Can cause line-bound and radiated interference in other areas
Devices in emission class B:
-
Satisfy the emissions criteria for residential and industrial areas. This is also
true for residential areas in which the energy is supplied from the public low-
voltage grid.
EMC device classification as per the rating plate or technical data.
EMC measures
In certain cases, even though a device complies with the standard limit values for
emissions, it may affect the application area for which it was designed (e.g., when
there is sensitive equipment at the same location, or if the site where the device
is installed is close to either radio or television receivers).
If this is the case, then the operating company is obliged to take appropriate ac-
tion to rectify the situation.
Test and assess the immunity of equipment in the vicinity of the device in ac-
cordance with national and international provisions. Examples of interference-
prone equipment that could be affected by the device:
-
Safety devices
-
Grid power lines, signal lines, and data transfer lines
-
IT and telecommunications equipment
-
Devices for measuring and calibrating
Supporting measures to avoid EMC problems:
1
.
Grid power supply
-
If electromagnetic interference occurs despite a grid connection that
complies with regulations, take additional measures (e.g., use a suitable
grid filter).
2
.
Welding power-leads
-
Keep them as short as possible
-
Route them close together (also to avoid EMF problems)
-
Route them far from other lines
12
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