Types Of Cabinet; Clearances In Cabinets - Siemens S5-155U System Manual

Selection and Installation of Cabinets with SIMATIC S5
3.7.1

Types of Cabinet

Open Cabinets
Through-ventilation by Increased
natural convection through-ventilation
Heat removal primarily Increased heat removal
by natural thermal through increased air
convection, small movement
portion via the cabinet
wall
Type of protection IP 20 Type of protection IP 20 Type of protection IP 54 Type of protection IP 54 Type of protection IP 54
Typical removable power dissipation under the following boundary conditions:
• •
Cabinet size 2200 x 600 x 600 mm
• •
Temperature difference between external and internal temperature of the cabinet: 20 °C**
Up to 700 W Up to 2700 W (1400 W
with very fine filter)
3.7.2

Clearances in Cabinets

3 - 36
The following table provides on overview of the most common types
of cabinet. It also shows the principle of heat removal, as well as the
estimated, maximum achievable power loss removal and the type of
protection* .
Natural convection
Heat removal only
through the cabinet wall;
only low power
dissipation permissible.
Heat accumulation
usually occurs in the top
of the cabinet.
Up to 260 W
* The location and ambient conditions are decisive for selection of the type of cabinet
protection (see IEC 529 and DIN 40050).
** For other temperature differences, refer to the temperature characteristics of the
cabinet manufacturer.
You must first define the components to be fitted in the cabinet. Then
calculate the total power dissipation of the individual components.
The following stipulations must be observed:
• • The expansion units can be accommodated with the respective
central controller in one cabinet, or in two or more cabinets
(centralized or distributed).
• • On account of the required clearances and maximum permissible
installation height for control elements, a maximum of three
SIMATIC S5 devices can be arranged one above the other.
Closed Cabinets
Forced circulation using Forced circulation using
fan assembly, enhanced heat exchanger, external
natural convection ventilation inside and
outside
Heat removal only via Heat removal through
the cabinet wall. Forced exchange between
ventilation of the heated internal air and
internal air results in cool outside air. The
improved heat removal increased surface of the
and prevention of heat folded-area sectional
accumulation. wall of the heat
exchanger and forced
circulation of internal
and external air permit
good heat output.
Up to 360 W Up to 1700 W
C79000-B8576-C199-03
System Manual