Siemens SIMATIC NET PROFIBUS - Manual (Page 323)

Installing Network Components in Cubicles
E-3
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
E.2 SIMATIC NET Components
Ventilation Openings
The casings of most SIMATIC NET network components have ventilation
openings. To allow more effective cooling of the electronics components, ambient
air can flow through the casing. The maximum operating temperatures quoted in
the technical specifications apply only when there is unrestricted flow of air through
the ventilation openings.
Depending on the size of the ventilation openings, such modules comply with the
degrees of protection IP 20, IP 30 to IP 40. You will find the actual degree of
protection of a SIMATIC NET component in its documentation.
Components with the degrees of protection mentioned above do not provide
protection against dust and water! If the installation site requires such protection,
the components must be installed in an additional enclosure such as a switching
cubicle that provides the higher degree of protection (for example IP 65/ IP 67).
If you install these components in an additional enclosure, make sure that the
conditions required for operation are maintained!
Heat Dissipation
Make sure that the temperature inside the additional enclosure does not exceed
the permitted ambient temperature for the installed components. Select an
enclosure with adequate dimensions or use heat exchangers.
Outdoor Installation
If you install the equipment outdoors, make sure that the additional enclosure is not
subjected to direct sunlight. This can lead to a considerable rise in temperature
within the enclosure.
Clearances
Make sure that there is adequate clearance around the component so that
S
the convection cooling of the component is not restricted
S
components do not cause neighboring components to heat up more than
permitted
S there is enough space for installing cabling
S there is enough space to remove components for maintenance or repair.