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Engineering
28
02/98 AWB 27-1314-GB
Arrangement of
equipment within the
control cabinet
The arrangement of the components in the control
cabinet has a significant influence on the correct
operation of the machine or plant. When planning,
designing and installing the equipment, ensure that
the power section and the control section are
separated from one another. The power section
includes:
Contactors,
Coupling modules,
Transformers,
Frequency inverters,
Current converters,
DC power supply units.
In order to effectively eliminate electromagnetic
interference, we recommend subdividing the control
cabinet into sections according to the different
power and interference levels. Simple partitions are
often sufficient to reduce interference in small control
cabinets.
Ventilation
In order to ensure adequate cooling, a minimum
clearance of 5 cm (approx. 2”) must be allowed
between the devices and the ventilation slots in the
housing.
Lightning protection
External lightning protection
All cables which are laid between two different
buildings must be screened. Metal conduits are
recommended for this purpose.
Protective devices against overvoltage, such as
varistors or other types of lightning arrester, should
be used for signal cables. The cables must be
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