Examples For Determining The Type Of Cabinet - Siemens S5-135U/155U System Manual

Installation Guidelines
Caution
!
Modules with a hard disk drive can only be used at an ambient temperature
of up to 50 C.
3.7.4

Examples for Determining the Type of Cabinet

The following example shows the maximum permissible ambient
temperature with various cabinet types and the same power dissipation.
Example
The following equipment configuration is given:
1
2
1
From Figure 3-16, with a total power dissipation of 900 W, the maximum
ambient temperatures given by the table are as follows:
Cabinet Design
Closed, with natural convection and forced
circulation (Curve 3)
Open with through-ventilation (Curve 2)
Closed, with heat exchanger (Curve 1)
3-38
Central controller
Expansion units, 250 W power dissipation each
Load PS, 24 V/40 A, 6EV1 362-5BK00 (full load)
Total power disspation
200 W
500 W
200 W
900 W
Max. Permissible Ambient
Temperature
(Operation not possible)
Approx. 33 C
Approx. 42 C
System Manual
C79000-G8576-C199-06