Electromagnetic Compatibility (EMC)
Spirit200a User’s Manual Rev J
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A-2
Assessment of Area
Before installing plasma cutting 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 plasma cutting 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 plasma 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
Plasma cutting equipment should 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 plasma cutting equipment in metallic conduit or
equivalent. Shielding should be electrically continuous throughout its
length. The shielding should be connected to the plasma power source so
that good electrical contact is maintained between the conduit and the
plasma power source enclosure.
Maintenance of the Plasma Cutting Equipment
The plasma cutting 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 plasma cutting
equipment is in operation. The plasma cutting equipment should not be
modified in any way except for those changes and adjustments covered in
the manufacturer’s instructions. In particular, the spark gaps of arc
striking and stabilizing devices should be adjusted and maintained
according to the manufacturer’s recommendations.
