Stray Welding Currents; Emc Device Classifications; Emc Measures - Fronius TWIN Push Operating Instructions Manual

Stray welding If the following instructions are not observed, stray welding currents may occur,
currents which pose a risk of the following:
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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 Devices in emission class A:
Classifications
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Devices in emission class B:
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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:
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Supporting measures to avoid EMC problems:
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2.
Fire
Overheating of parts connected to the workpiece
Irreparable damage to ground conductors
Damage to the 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 grid.
Safety devices
Grid power lines, signal lines, and data transfer lines
IT and telecommunications equipment
Devices for measuring and calibrating
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).
Welding power-leads
- Keep them as short as possible
- Route them close together (also to avoid EMF problems)
- Route them far from other lines
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