Electromagnetic Emissions - GYS ARCPULL 350 Benutzerhandbuch

Operating manual

ELECTROMAGNETIC EMISSIONS

Electric current passing through any conductor produces localized electric and magnetic fields (EMF). The welding current produces
an electromagnetic field around the welding circuit and the welding equipment.
EMF electromagnetic fields can interfere with certain medical implants, for example pacemakers. Protective measures should be taken for people with
medical implants. For example, access restrictions for passers-by or an individual risk assessment for welders.
All welders should use the following procedures to minimize exposure to electromagnetic fields from the welding circuit:
• position the welding cables together – secure them with a clamp, if possible;
• position yourself (torso and head) as far as possible from the welding circuit;
• never wrap the welding cables around the body;
• do not position the body between the welding cables. Hold both welding cables on the same side of the body;
• connect the return cable to the workpiece as close as possible to the area to be welded;
• do not work next to the source of welding current, do not sit on it or do not lean against it;
• Do not weld while transporting welding power source or wire feeder.
Wearers of pacemakers should consult a physician before using this equipment.
Exposure to electromagnetic fields during welding may have other health effects that are not yet known.
RECOMMENDATIONS FOR ASSESSING THE WELDING AREA AND INSTALLATION
General
The user is responsible for the installation and use of arc welding equipment according to the manufacturer's instructions. If electromagnetic
disturbances are detected, it should 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 corrective action may be as simple as grounding the welding circuit. In other cases, it may be necessary to
construct an electromagnetic shield around the welding current source and the entire work piece with input filters fitted. In any case, the electromagnetic
disturbances must be reduced until they are no longer annoying.
Assessment of the welding area
Before installing arc welding equipment, the user should assess potential electromagnetic problems in the surrounding area. The following should be
considered:
a) the presence above, below and beside the arc welding equipment of other power, control, signaling and telephone cables;
(b) radio and television receivers and transmitters;
(c) computers and other control equipment;
d) safety-critical equipment, for example, protection of industrial equipment;
e) the health of neighboring people, for example, use of pacemakers or hearing aids;
(f) equipment used for calibration or measurement;
g) the immunity of other materials present in the environment.
The user must ensure that other hardware used in the environment is compatible. This may require additional protective measures;
h) the time of day when welding or other activities are to be performed.
The size of the surrounding area to be considered depends on the structure of the building and the other activities taking place there. The surrounding
area may extend beyond the boundaries of the facilities.
Assessment of the welding installation
In addition to the area assessment, the assessment of arc welding installations can be used to identify and resolve disturbance cases. The emissions
assessment should include in situ measurements as specified in Clause 10 of CISPR 11. In situ measurements can also confirm the effectiveness of
mitigation measures.
RECOMMENDATIONS ON METHODS OF REDUCING ELECTROMAGNETIC EMISSIONS
has. Public power supply network: Arc welding equipment should be connected to the public power supply network according to the manufacturer's
recommendations. If interference occurs, it may be necessary to take additional preventive measures such as filtering the public power supply
network. Consideration should begiven to shielding the supply cable in metallic conduit or equivalent of permanently installed arc welding equipment.
The electrical continuity of the shielding must be ensured over its entire length. The shield should be connected to the welding power source to ensure
good electrical contact between the conduit and the welding power source enclosure.
b. Maintenance of arc welding equipment: Arc welding equipment should be subject to routine maintenance as recommended by the manufacturer.
All accesses, service doors and covers should be closed and properly locked when arc welding equipment is in use. Arc welding equipment should
not be modified in any way other than the modifications and adjustments mentioned in the manufacturer's instructions. In particular, the arc arrester of
arc ignition and stabilization devices should be adjusted and maintained according to the manufacturer's recommendations.
vs. Welding cables: Cables should be as short as possible, placed close to each other near the floor or on the floor.
d. Equipotential Bonding: Consideration should be given to bonding all metallic objects in the surrounding area. However, metallic objects attached
to the workpiece increase the risk for the operator of electric shocks if he touches both these metallic elements and the electrode. The operator should
be isolated from such metal objects.
e. Grounding of the workpiece: When the workpiece is not grounded for electrical safety or due to its size and location, for example the hulls of ship
or the metal frames of buildings, a connection connecting the room to the ground can, in certain cases and not always, reduce the emissions. Care
should be taken to avoid grounding of parts which could increase the risk of injury to users or damage other electrical equipment. If necessary, the
connection of the work piece to earth should be made directly, but in some countries which do not allow this direct connection, the connection should
be made with an appropriate capacitor chosen according to national regulations.
f. Protection and shielding: Selective protection and shielding of other cables and equipment in the surrounding area can limit disturbance problems.
Protection of the entire welding area can be considered for special applications.
Translation of the original
instructions
ARCPULL 350
35