Power Loss Dissipated; Choice Of Cabinets - Siemens SIMATIC S7-300 Hardware And Installation Manual

Ambient temperature in °C
60
50
40
30
20
1
2
3
Figure 5-6 Power loss dissipated
Result:
From the diagram we can see that the following ambient temperatures are obtained
for a total power loss of 650 W:
Table 5-6
Closed, with natural convection and forced convection
(curve 3)
Open, with enclosed ventilation (curve 2)
Closed, with heat exchanger (curve 1)
If you install the S7-300 horizontally, you can use the following types of cabinet:
• open, with closed ventilation
• closed, with heat exchanger
see also
Selection and installation of cabinets
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
3
200
400 600
Closed cabinet with heat exchanger;
size of heat exchanger 11/6 (920 x 460 x 111 mm)
Cabinet with enclosed ventilation by self-convention
Closedf cabinet with natural and forced ventilation with device fan

Choice of cabinets

Cabinet design
2
800 1000 1200
Loss of Heat in W
Maximum permitted ambient
Operation not possible
approx. 38 degC
approx. 45 degC
[ → Page 5-12]
Configuring
1
1400
temperature
5-15