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EMC Device Clas-
sifications
EMC measures
12
If the floor is electrically conductive, the device must be set up with sufficient
insulating material to insulate it from the floor.
If distribution boards, twin-head mounts, etc., are being used, note the follow-
ing: The electrode of the welding torch / electrode holder that is not used is
also live. Make sure that the welding torch / electrode holder that is not used
is kept sufficiently insulated.
In the case of automated MIG/MAG applications, ensure that only an insulated
wire electrode is routed from the welding wire drum, large wirefeeder spool or
wirespool to the wire-feed unit.
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 sup-
plied from the public low-voltage mains.
EMC device classification as per the rating plate or technical data.
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 operator is obliged to take appropriate action to rec-
tify the situation.
Check and evaluate the immunity to interference of nearby devices according
to national and international regulations. Examples of equipment that may be
susceptible to interference from the device include:
-
Safety devices
-
Power, signal and data transfer lines
-
IT and telecommunications devices
-
Measuring and calibrating devices
Supporting measures for avoidance of EMC problems:
1.
Mains supply
-
If electromagnetic interference arises despite correct mains connec-
tion, additional measures are necessary (e.g. use a suitable line fil-
ter).
2.
Welding power leads
-
must be kept as short as possible
-
must run close together (to avoid EMF problems)
-
must be kept well apart from other leads
3.
Equipotential bonding
4.
Earthing of the workpiece
-
If necessary, establish an earth connection using suitable capacitors.
5.
Shielding, if necessary
-
Shield off other nearby devices
-
Shield off entire welding installation
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