Selection And Installation Of Cabinets - Siemens S7-300 Installation Manual

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Ambient temperature in °C
Figure 5-6 Power loss dissipated
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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 ventilation
(Curve 3)
Open with through-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
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Selection and installation of cabinets

5-16
60
50
40
30
3
20
200
400 600
Closed cabinet with heat exchanger (heat exchanger size 11/6 (920 mm x 460
mm x 111 mm)
Cabinet with through-ventilation by natural convection
Closed cabinet with natural convection and forced ventilation by equipment
fans
Choice of cabinets
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
1
1 2
800 1000 1200
Loss of heat in W
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Operation not possible
approx. 38 °C
approx. 45 °C
1400
A5E00203919-01