Hypertherm Powermax30 Operator Manual - Manual (Page 6)

ELECTROMAGNETIC COMPATIBILITY (EMC)
4-08
ii Hypertherm
Maintenance of cutting equipment
The cutting equipment must be rou tine ly
maintained according to the man u fac tur er’s
recom men da tions. All ac cess and service doors
and covers should be closed and properly
fastened when the cutting equip ment is in
operation. The cutting equipment should not be
modified in any way except for those chang es
and ad just ments covered in the manufac tur er’s
instructions. In par tic u lar, the spark gaps of arc
striking and sta bi liz ing devices should be
adjusted and maintained according to the
manu fac tur er’s recommendations.
Cutting cables
The cutting cables should be kept as short
as possible and should be po si tioned close
together, running at or close to the floor level.
Equipotential bonding
Bonding of all metallic components in the
cutting installation and adjacent to it should be
considered. However, metallic com po nents
bonded to the workpiece will increase the risk
that the op er a tor could receive a shock by
touch ing these metallic compo nents and the
electrode (nozzle for laser heads) at the same
time. The op er a tor should be in su lat ed from all
such bonded metallic components.
Earthing of workpiece
Where the workpiece is not bonded to earth
for electrical safety, nor connected to earth
because of its size and position, for ex am ple,
ship’s hull or building steel work, a con nec tion
bonding the work piece to earth may reduce
emis sions in some, but not all instances.
Care should be taken to prevent the earthing
of the work piece increasing the risk of injury to
users, or damage to other elec tri cal equip ment.
Where necessary, the con nec tion of the
workpiece to earth should be made by a direct
connection to the work piece, but in some
countries where direct connection is not
permitted, the bonding should be achieved by
suit able capacitances se lect ed according to
national regulations.
Note: the cutting circuit may or may not be
earthed for safety reasons. Changing the
earthing arrangements should only be
authorized by a person who is com pe tent to
assess whether the chang es will in crease the
risk of injury, for example, by al low ing parallel
cutting cur rent return paths which may damage
the earth cir cuits of other equipment. Further
guid ance is given in IEC/ TS 62081 Arc
Welding Equip ment Installation and Use.
Screening and shielding
Selective screening and shielding of other
cables and equipment in the surrounding area
may alleviate problems of in ter fer ence.
Screening of the entire plas ma cutting
installation may be con sid ered for special
applications.
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