Meandering Welding Currents; Emc Device Classifications; Emc Measures - Fronius CU 1100i Operating Instructions Manual

Meandering weld- If the following instructions are ignored, meandering welding currents can develop with
ing currents the following consequences:
-
-
-
-
Ensure that the workpiece is held securely by the workpiece clamp.
Attach the workpiece clamp as close as possible to the area that is to be welded.
Position the device with sufficient insulation against electrically conductive environments,
e.g. Insulation against conductive floor or insulation to conductive racks.
If distribution boards, twin-head mounts, etc., are being used, note the following: 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 elec-
trode is routed from the welding wire drum, large wirefeeder spool or wirespool to the
wirefeeder.
EMC Device Clas- Devices in emission class A:
sifications -
-
Devices in emission class B:
-
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 emis-
sions, 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 rectify 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 interfer-
ence from the device include:
-
-
-
-
Supporting measures for avoidance of EMC problems:
1.
2.
3.
4.
10
Fire hazard
Overheating of parts connected to the workpiece
Irreparable damage to ground conductors
Damage to device and other electrical equipment
Are only designed for use in industrial settings
Can cause line-bound and radiated interference in other areas
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 mains.
Safety devices
Power, signal and data transfer lines
IT and telecommunications devices
Measuring and calibrating devices
Mains supply
- If electromagnetic interference arises despite correct mains connection, addi-
tional measures are necessary (e.g. use a suitable line filter).
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
Equipotential bonding
Earthing of the workpiece
- If necessary, establish an earth connection using suitable capacitors.