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INSTRUCTIONS FOR ELECTROMAGNETIC COMPATIBILITY
WARNING
This welding machine must be used by trained operators only.
Read this manual carefully before attempting to use the
welding machine.
The purchaser 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. 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 authorised by a person who is competent to
assess whether the changes increase the risk of injury, e.g.
by allowing parallel welding current return paths which may
damage the earth circuits of other equipment.
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:
a. Other supply cables, control cables, signalling and
telephone cables; above, below and adjacent to the
welding equipment;
b. Radio and television transmitters and receivers;
c. Computer and other control equipment;
d. Critical safety equipment, e.g. automatic machine
guards;
e. Personal electronic equipment, e.g. pacemakers and
hearing aids;
f. Equipment used for calibration or 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 the day that welding or other activities are to
be carried out.
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.
IMA 523D
Methods of Reducing Emissions
Maintenance of the 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 manufacturers instructions. In particular, the spark
gaps of arc initiation and stabilising devices should be
adjusted and maintained according to the manufacturers
recommendations.
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.
Earth Bonding of Installation
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 these metallic components and the electrode at
the same time. The operator should be insulated from all
such bonded metallic components.
Earthing of the Workpiece
Where the workpiece is not bonded to earth for electrical
safety, nor connected to earth because of its size and
position, e.g. ships hull or building steelwork, a connection
bonding the workpiece to earth should be made by a direct
connection to the workpiece. In some countries where direct
connection is not permitted, the bonding should be
achieved by suitable capacitance, selected according to
national regulations.
Screening and Shielding
Selective screening and shielding of other cables and
equipment in the surrounding area may alleviate problems
of interference. Screening of the entire welding installation
may be considered for special applications.
Shield-Arc SAM-400
Page 5
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