ELECTROMAGNETIC INTERFERENCE (EMC)
Whilst this unit complies with EMC regulations, the user is responsible for installing
and using the welding equipment according to the manufacturers instructions. If
electromagnetic disturbances are detected then it shall be the responsibility of
the user of the welding equipment to resolve the situation. 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 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.
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.
1. Assessment of area
Before installing welding equipment the user shall make an assessment of potential
electromagnetic problems in the surrounding area. Avoid using your inverter in
the vicinity of:
a)
other supply cables, control cables, signalling and telephone cables;
above, below and adjacent to the 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)
pacemakers and hearing aids etc;
f)
equipment used for calibration or measurement;
g)
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;
It may be possible to avoid the above by changing 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.
Methods of reducing emissions
2.1 Mains supply
Welding equipment should be connected to the mains supply according to the
manufacturers recommendations. If interference occurs, it may be necessary to
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