Meandering Welding Currents; Emc Device Classifications; Emc Measures - Fronius KD 4000 D-11 Operating Instructions Manual

If necessary, provide adequate earthing for the workpiece.
Switch off unused devices.
Wear a safety harness if working at height.
Before working on the device, switch it off and pull out the mains plug.
Attach a clearly legible and easy-to-understand warning sign to the device to
prevent anyone from plugging the mains plug back in and switching it on again.
After opening the device:
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If work on live parts is required, have a second person switch off the main switch
at the right moment.
Meandering If the following instructions are ignored, meandering welding currents can devel-
welding currents op with the following consequences:
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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 envir-
onments, 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 suffi-
ciently 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 wirefeeder.
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).
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Discharge all live components
Ensure that all components in the device are de-energised.
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.