Electromagnetic Compatibility（Emc - Nielsen CT4973 Original Instruction

ELECTROMAGNETIC COMPATIBILITY（EMC）
All electrical equipment generates small amounts of electromagnetic emission due to current transferring in
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the equipment. Electrical emission may be transmitted through power lines or radiated through space, similar
to a radio transmitter. When emissions are received by other equipment, electrical interference may result .
Electrical emissions may affect not only welding machines but also many kinds of electrical equipment
like radio and TV reception, numerical controlled machines, telephone systems, computers etc.
Welding and cutting machines have been designed to work for professional and industrial use; for other
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applications to contact the manufacturers.
●The user is responsible for installing and using the equipment according to the manufacturer's instructions.
If electromagnetic disturbances are detected then it shall be the responsibility of the user of the 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 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.
●The circuit may or may not be earthed for safety reasons. Changing the earthing arrangements should only be
authorized 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.
●Extra precaution may be required when the welding power source is used in a domestic establishment.
●Special measures shall be taken to achieve compliance with welding power source including HF frequency for arc
ignition and stabilizing; it may be required use of shielded cables and in any case to resolve the particular
implementation (e.g. with robot, computer and any other electrical and electronic equipment connected to
welding power source) to call the technical assistance of the manufacturer.
EMC is Class A according to CISPR II.
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Before installing the welding equipment, the user shall make an assessment of potential electromagnetic
problems in the surrounding area. The following shall be taken into account- if needed arrange the
working hours that not coincide with those.
●Other supply cables, control cables, signaling and telephone cables; above, below and adjacent to the
welding equipment,
●Radio and television transmitters and receivers,
●Computer and other control equipment,
●Safety critical equipment,
●Presence of heart beat regulators, heart cells, hearing devices or etc. nearby,
●Equipment used for calibration or measurement,
The immunity of other equipment in the environment.
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The user shall ensure that other equipment being used in the environment is compatible. This may
require additional protection measures.
●Welding equipment should be connected to the mains supply according to the manufacturer's recommendations.
Our welding machines are filtered against emission according to standards. If interference still occurs, it may be
necessary to take additional precautions such as filtering of the mains supply.
The equipment should be routinely maintained according to the manufacturer's recommendations. The
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welding equipment should not be modified without the approval of manufacturer.
The welding cables should be kept as short as possible and should be positioned close together, running at or
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close to the floor level. Power cables and signal cables should be kept separately.
●Keeping cables in the shape of -8- and taping together reduce emission.
●Connect earth clamp to workpiece as close to the weld as possible. But the user should be control whether this
situation damage to people and equipment or not.
ELECTROMAGNETIC EMISSION
ASSESMENT OF THE SURROUNDING AREA
METHODS OF REDUCING EMISSIONS
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