Tweco ArcMaster 401MST - Manual (Page 35)

ARCMASTER 401MST POWER SOURCE
Manual 0-5287 3-5 INSTALLATION, OPERATION AND SETUP
C. Methods of Reducing Electromagnetic Emissions
1. Main Power Supply
Welding equipment should be connected to the
mains supply according to the manufacturer’s
recommendations. 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 equipment
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 adjustments covered in the manufacturer’s
instructions. In particular, the spark gaps of
arc striking and stabilising 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.
5. Grounding of the Workpiece
Where the workpiece is not bonded to earth
for electrical safety, nor connected to earth
grounding because of it’s size and position, e.g.
ship’s hull or building steelwork, a connection
bonding the workpiece to earth may reduce
emissions in some, but not all instances. Care
should be taken to prevent the earthing of the
workpiece increasing the risk of injury to users,
or damage to other electrical equipment. Where
necessary, the connection of the workpiece to
earth should be made by direct connection to the
workpiece, but in some countries where direct
connection is not permitted, the bonding should
be achieved by suitable 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 problems of interference. Screening the
entire welding installation may be considered for
special applications.