Safety and Compliance SC-11
Electromagnetic Compatibility (EMC)
Introduction
Hypertherm’s CE-marked equipment is built in compliance
with standard EN60974-10. The equipment should be
installed and used in accordance with the information
below to achieve electromagnetic compatibility.
The limits required by EN60974-10 may not be adequate
to completely eliminate interference when the affected
equipment is in close proximity or has a high degree of
sensitivity. In such cases it may be necessary to use other
measures to further reduce interference.
This cutting equipment is designed for use only in an
industrial environment.
Installation and use
The user is responsible for installing and using the plasma
equipment according to the manufacturer’s instructions.
If electromagnetic disturbances are detected then it shall
be the responsibility of the user to resolve the situation
with the technical assistance of the manufacturer. In some
cases this remedial action may be as simple as earthing
the cutting circuit, see Earthing of the work piece. 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.
Assessment of area
Before installing the 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, signaling
and telephone cables; above, below and adjacent
to the cutting equipment.
b. Radio and television transmitters and receivers.
c. Computer and other control equipment.
d. Safety critical equipment, for example guarding of
industrial equipment.
e. Health of the people around, for example the use
of pacemakers and hearing aids.
f. Equipment used for calibration or measurement.
g. Immunity of other equipment in the environment.
User shall ensure that other equipment being
used in the environment is compatible. This may
require additional protection measures.
h. Time of day that cutting 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.
Methods of reducing emissions
Mains supply
Cutting equipment must 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 cutting equipment, in
metallic conduit or equivalent. Shielding should be
electrically continuous throughout its length. The shielding
should be connected to the cutting mains supply so that
good electrical contact is maintained between the conduit
and the cutting power source enclosure.
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