Tweco 175 SE Arc Master - Manuel (Page 23)

INSTALLATION ARC MASTER 175 SE
Manual 0-5054 3-3 INSTALLATION
3.04 Electromagnetic Compatibility
!
WARNING
Extra precautions for Electromagnetic Compatibility
may be required when this Welding Power Source 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 electromag-
netic screen enclosing the Welding Power Source and the
work, complete with associated input filters. In all cases,
electromagnetic disturbances shall be reduced to the point
where they are no longer Trouble-some.
NOTE
For 230 VAC operation, have a qualified person install
according to applicable codes, and instructions.
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, signalling 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 pace-mak-
ers 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 immunity of other equipment in the environment:
the user shall ensure that other equipment being used
in the environment is compatible: this may require ad-
ditional 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. Mains Supply
Welding equipment should be connected to the mains
supply according to the manufacturer’s recommenda-
tions. If interference occurs, it may be necessary to take
additional precautions such as filtering of the mains
supply. Consideration should be given to shielding the
supply cable of permanently installed welding equip-
ment in metallic conduit or equivalent. Shielding should
be electrically continuous throughout its length. The
shielding should be connected to the Welding Power
Source so that good electrical contact is maintained
between the conduit and the Welding Power Source
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 ad-
justments 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 recommendation
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 instal-
lation 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.
5. Earthing of the Work Piece
Where the work piece is not bonded to earth for electri-
cal safety, nor connected to earth because of its size
and position, e.g. ship’s hull or building steelwork, a
connection bonding the work piece to earth may reduce
emissions in some, but not all instances. Care should
be taken to prevent the earthing of the work piece in-
creasing the risk of injury to users, or damage to other
electrical equipment. Where necessary, the connection
of the work piece to earth should be made by direct
connection to the work piece, but in some countries
where direct connection is not permitted, the bonding
should be achieved by suit-able capacitance, selected
according to national regulations.
6. Screening and Shielding
Selective screening and shielding of other cables and
equipment in the surrounding area may alleviate prob-
lems of interference. Screening the entire welding in-
stallation may be considered for special applications.