L-TEC PLASMAWELD 202, Инструкция по эксплуатации

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Installation and use under the aspect of electromagnetic compatibility (EMC)
The user is responsible for installing and using the welding or cutting equipment according to
the manufacturers instructions. If electromagnetic disturbances are detected, then it shall be
the responsibility of the user of the welding or cutting equipment to resolve the situation with
the technical assistance of the manufacturer. In some cases this remedial action may be as
simple as earthing the welding circuit ( see Note ). In other cases it could involve constructing
an electromagnetic screen enclosing the power source and the work complete with associated
input filters. In all cases electromagnetic disturbances must be reduced to the point, where
they are no longer troublesome.
NOTE: The welding circuit may or may not be earthed for safety reasons. Changing the earthing
arrangements should only be authorized by a person who is competent to assess whether the
changes will increase the risk of injury, e.g. by allowing parallel welding or cutting current return
paths which may damage the earth circuits of other equipment. Further guidance is given in IEC
TC26(sec)94, arc welding equipment installation and use.
A.1 Assessment of area
Before installing welding or cutting equipment the user shall make an assessment of potential electromag-
netic problems in the surrounding area. The following shall be taken into account:
a) Other supply cables, control cables, signalling and telephone cables above, below and adjacent to
the welding or cutting equipment.
b) Radio and television transmitters and receivers.
c) Computer and other control equipment.
d) Safety critical equipment, e.g. guarding of industrial equipment.
e) The health of people around, e.g. the use of pacemakers and hearing aids.
f) Equipment used for calibration and measurement.
g) The immunity of other equipment in the environment. The user shall ensure, that other equipment
being used in the environment is compatible. This may require additional protection measures.
h) The time of day that welding/cutting or other activities are to be carried out.
The size of surrounding area be considered will depend on the structure of the building
and other activities that are taking place. The surrounding area may extend beyond the
boundaries of the premises.
A.2 Methods of reducing emission
A.2.1 Mains supply
Welding equipment should be connected to the mains supply according to the manufacturers recom-
mendations. If interference occurs, it may be necessaray to take additional precautions such filtering of
the mains supply. Consideration should be given to shielding the supply cable of permanently installed
welding or cutting equipment in metallic conduit or equivalent. Shielding should be electrically continuous
throughout ist length. The shielding should be connected to the welding power source so that good elec-
trical contact is maintained between the conduit and the power source enclosure.
Annex EMC