Xnexus NXS 150, Operating Manual

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Notice NOT 083
NXS 150
Rev : 00
Date : 13/10/05
SAFETY
If electromagnetic disturbances are detected, then it shall be the responsibility of the user of the arc 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. In other cases it could involve constructing an
electromagnetic 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 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 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 IEC 62081 "Arc welding equipment - Installation and use" (under consideration).
2.2.1. ASSESSMENT OF AREA
Before installing arc 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 arc
welding equipment;
b) Radio and television transmitters and receivers;
c) Computer and other control equipment;
d) Safety critical equipment, e.g. guarding of industrial equipment,
e) The health of the people around, e.g. the use of 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 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.
2.2.2. METHODS OF REDUCING EMISSIONS
2.2.2.1. Public supply system
Arc welding equipment should be connected to the public supply system according to the manufacturer’s
recommendations. If interference occurs, it may be necessary to take additional precautions such as filtering of the
public supply system. Consideration should be given to shielding the supply cable of permanently installed arc
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.
2.2.2.2. Maintenance of the arc welding equipment
The arc 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 arc welding equipment is in
operation. The arc welding equipment should not be modified in any way, except for those changes and
USER’S MANUAL
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