Installing the S7-400
2-27
Automation System S7-400 Hardware and Installation
A5E00850741-01
Removable Power Dissipation from Cabinets (Example)
The removable power dissipation from a cabinet is governed by the type of cabinet,
its ambient temperature, and the arrangement of equipment in the cabinet.
Figure 2-2 shows a diagram with guide values for the permissible ambient
temperature of a cabinet measuring 600 x 600 x 2000 mm as a function of power
dissipation. These v alues only apply if y ou observe the specified installation
dimensions and clearances for racks. Further information can be found in Siemens
catalogs NV21 and ET1.
200 400 600 800 1000 1200 1400 W
Power dissipation
20
30
40
50
60
Ambient temperature in °C
1
2
3
Figure 2-2 Max. Cabinet Ambient Temperature as a Function of Power Dissipation of
Equipment in the Cabinet
Legend for Figure 2-2:
1. Closed cabinet with heat exchanger;
heat exchanger size 11/6 (920 x 460 x 111 mm)
2. Cabinet with through-ventilation by natural convection
3. Closed cabinet with natural convection and forced circulation by equipment fans
!
Warning
Risk of damage to the modules.
Modules may be damaged as a result of excess ambient temperature.
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