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Air Cooling Requirements - Siemens PM250 Hardware Installation Manual

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3.2 Air cooling requirements

Air cooling requirements
Installation and cooling
Make sure that there is an adequate airflow through the cubicle as follows:
1. Add the air flow values required for every Power Module (see following table) within the
2. Calculate the airflow required by components as reactor, filter, Control Unit and other
3. Add the airflow values of all components within the cubicle to get the complete air flow
4. No equipment should be installed that could have a negative effect on the flow of cooling
5. Make sure that the cooling vents in the Power Module are positioned correctly to allow
6. Avoid cooling air short circuit using air barriers, if necessary
7. Provide an adequate cubicle with sufficient air vent and suitable air strainer
electronic devices using the formula
Air flow (l/s) = (Power loss (Watt) / ΔT) x 0.86
(ΔT = Allowable temperature rise within the cubicle in °C).
For the power losses of components see the following table
the free movement of air
Figure 3-1
Air barriers for avoiding cooling air short circuits
Hardware Installation Manual, 09/2012, A5E01003502B AD
PM250 Power Module


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