Kjellberg SmartFocus 300 Short Instruction Manual page 64

Power source Smart Focus 300
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General information
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The operator has to follow national and local regulations! (for example in germany
Employer's Liability Insurance Association and in canada CAN/CSA-W117.2)
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Between workpiece and cutting table must be a good electrical contact!
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The potential equalisation of the entire system is the responsibility of the operator and has to be carried out
by an electrician *).
When integrating components of other manufacturers into the plant complex (e.g. cutting table, guiding
system), it is necessary to follow the specific information given by those other manufacturers.
Protective potential equalisation
The protective potential equalisation for all relevant components of the complex is used as basic provision in
case of a failure. It protects persons against electric shock in case of indirect contact *).
Functional potential equalisation
The functional potential equalisation is used in order to reduce the effects that an insulation fault as well as
electric and electromagnetic disturbances might have on the operation of the plant.
Normally, the functional potential equalisation is realised by a connection with the protective conductor
system. If, however, the electric interference level on the protective conductor system is too high so that the
proper operation of the complex is no longer guaranteed, there is the option to install a separate earthing
conductor which serves as additional functional earthing (see picture below.
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Potential equalisation and protective conductor guidance
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The potential equalisation has to be done in star shape by the shortest possible wires (preferably copper
wires) with the largest possible cross section. We recommend a conductor cross section Cu of at least
25 mm² *). The wires have to be marked with the two-colour combination GREEN-YELLOW *).
The potential equalisation between plasma cutting unit, gas console, PBA and cutting table or guiding
system is the responsibility of the operator. For this purpose, the plasma cutting unit, the gas console and
the PBA are each equipped with a thread bolt size M8. The wires are not part of the delivery content.
The following picture shows an example of potential equalisation and protective conductor guidance.
Depending on the configuration of the plant, there may be deviations from this example.
*) Cf. also EN 60204-1 (IEC 60204-1)
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