Siemens S7-400 installation manual Removable Power Dissipation from Cabinets Example

Installing the S7-400

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 values only apply if you observe the specified installation dimensions and clearances for racks. Further information can be found in Siemens catalogs NV21 and ET1.

Ambient temperature in °C

60

50

40

30

20

1

2

3

200 400 600 800 1000 1200 1400 W

Power dissipation

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.

Automation System S7-400	Hardware and Installation	2-27
A5E00850741-01