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Instructions for the installation and operation
of an arc welding device to prevent possible
electromagnetic interference:
As the manufacturer, we recommend that the follow-
ing assessments and measures be carried out by a
qualified electrician.
General
The user is responsible for setting up and operat-
ing the arc welding machines/cutting equipment
in accordance with the manufacturer's instructions.
If electromagnetic interference is detected, it is
the responsibility of the user of the arc welding
machines/cutting equipment to find a solution with
the technical assistance of the manufacturer. In some
cases, the measure needed may simply consist of
earthing the welding circuit (see note). In other cases,
it may include complete electromagnetic shielding of
the power source of the arc welding machine/cutting
equipment and the workpiece, combined with input
filters. In all cases, electromagnetic interference must
be reduced until it no longer causes any disturbance.
Note
The approach taken to earthing the welding circuit
depends on the local safety regulations.
Changing the earthing to improve electromagnetic
compatibility may increase the risk of accidents or
damage to equipment
Assessing the surroundings
Before setting up the arc welding machines and/
or cutting equipment, the user must assess possible
electromagnetic problems in the surroundings.
When doing so, the following factors must be taken
into account:
a) other mains cables, control cables, signal and tele-
communication cables above, below and next to the
arc welding machines and/or cutting equipment;
b) Audio and television broadcast transmitters and
receivers;
c) Computers and other control devices;
d) Safety equipment, e.g. protection for commercial
facilities;
e) the health of persons nearby, e.g. those using
pacemakers and hearing aids;
f) Calibration and measurement equipment;
g) the resistance of other equipment in the vicinity to
interference. The user must ensure that
other equipment used in the environment is suit-
able for such a purpose. This may require additional
protective measures;
h) the time of day during which the welding, cutting,
or other activities must be carried out.
The extent of that surrounding area that must be con-
sidered depends on how the building is constructed,
and the other activities taking place there. This area
may extend beyond the limits of the premises
Evaluation of the welding machine / cutting equip-
ment
In addition to the assessment of the area, the arc
welding machines/cutting equipment can be evalu-
ated to assess and resolve cases of interference. An
assessment of electromagnetic interference should
include in situ measurements, as specified in section
10 of CISPR 11:2009. In-situ measurements can also
be made to gauge the effectiveness of any minimisa-
tion measures implemented.
Guidance for minimisation measures:
Public power supplies
Welders machines/cutting equipment should be
connected to the public power supply as per the
manufacturer's recommendations. If there is any
interference, it may be necessary to take additional
precautions, such as fitting filters for the mains con-
nection. Consider shielding the mains cable of perma-
nently installed welding machines/cutting equipment
with a metal pipe or similar. The shielding should be
electrically connected for its entire length. The shield-
ing should be connected to the welding machine/
cutting equipment power source to achieve
good electrical contact between the sheath and the
housing of the welding machine/cutter power source.
Maintenance of the arc welding machines/cutting
equipment
Arc welding machines/cutting equipment should
be regularly maintained as per the manufacturer's
recommendations. All access and service doors and
covers should be closed and well secured when the
welding machine/cutting equipment is in operation.
With the exception of the changes and adjustments
specified in the manufacturer's instructions, the
welding machines/cutting equipment should not
be modified in any way. In particular, the spark gaps
of arc ignition and stabilisation devices should be
adjusted and maintained in accordance with the
manufacturer's
recommendations.
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