Siemens SIMATIC NET PROFIBUS manual Simatic NET Components, Ventilation Openings, Heat Dissipation

Installing Network Components in Cubicles

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

Sthe convection cooling of the component is not restricted

Scomponents do not cause neighboring components to heat up more than permitted

Sthere is enough space for installing cabling

Sthere is enough space to remove components for maintenance or repair.

PROFIBUS Networks SIMATIC NET	E-3
6GK1970-5CA20-0AA1 Release 2 05/2000