Firepower MST 140i
Manual 0-53
38
3-3
INSTALLATION, OPERATION AND SETUP
3.05 Electromagnetic Compatibility
WARNING
Extra precautions for Electromagnetic Compatibility
may be required when this Welding Power Source
System is used in a domestic situation.
A. Installation and Use - Users Responsibility
The user is responsible for installing and using the welding
equipment according to the manufacturer’s instructions.
If electromagnetic disturbances are detected then it shall
be the responsibility of the user of the welding 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 below. In other cases it could involve constructing
an electromagnetic screen enclosing the Welding Power
Source System and the work, complete with associated
input filters. In all cases, electromagnetic disturbances
shall 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 current return paths
which may damage the earth circuits of other
equipment. Further guidance is given in EN 60974-
13 Arc Welding Equipment - Installation and use
(under preparation).
B. Assessment of Area
Before installing welding equipment, the user shall make
an assessment of potential electromagnetic problems in
the surrounding area. The following shall be taken into
account
1. Other supply cables, control cables, signaling and
telephone cables; above, below and adjacent to the
welding equipment.
2. Radio and television transmitters and receivers.
3. Computer and other control equipment.
4. Safety critical equipment, e.g. guarding of industrial
equipment.
5. The health of people around, e.g. the use of
pacemakers and hearing aids.
6. Equipment used for calibration and measurement.
7. The time of day that welding or other activities are to
be carried out.
8. The compatibility 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.
The size of the surrounding area to 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.
C. Methods of Reducing Electromagnetic Emissions
1. Electricity Supply
Welding equipment should be connected to the
Electricity Supply according to the manufacturer’s
recommendations. If interference occurs, it may
be necessary to take additional precautions such
as filtering of the Electricity Supply. Consideration
should be given to shielding the supply cable of
permanently installed welding equipment in metallic
conduit or equivalent. Shielding should be electrically
continuous throughout it’s length. The shielding
should be connected to the Welding Power Source
System so that good electrical contact is maintained
between the conduit and the Welding Power Source
System enclosure.
2. Maintenance of Welding Equipment
The welding equipment should be routinely maintained
according to the manufacturer’s recommendations. All
access and service doors and covers should be closed
and properly fastened when the welding equipment
is in operation. The welding equipment should not
be modified in any way except for those changes
and adjustments covered in the manufacturer’s
instructions. In particular, the spark gaps of arc
striking and stabilizing devices should be adjusted
and maintained according to the manufacturer’s
recommendations.
3. Welding Cables
The welding cables should be kept as short as possible
and should be positioned close together, running at
or close to the floor level.
4. Equipotential Bonding
Bonding of all metallic components in the welding
installation and adjacent to it should be considered.
However. Metallic components bonded to the work
piece will increase the risk that the operator could
receive a shock by touching the metallic components
and the electrode at the same time. The operator
should be insulated from all such bonded metallic
components.
Summary of Contents for MST 140i
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