Siemens PM250 - 3.2 Air cooling requirements

Installing/Mounting
3.2 Air cooling requirements
PM250 Power Module
20 Hardware Installation Manual, 09/2012, A5E01003502B AD
3.2 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
cubicle
2. Calculate the airflow required by components as reactor, filter, Control Unit and other
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
3. Add the airflow values of all components within the cubicle to get the complete air flow
required
4. No equipment should be installed that could have a negative effect on the flow of cooling
air
5. Make sure that the cooling vents in the Power Module are positioned correctly to allow
the free movement of air
6. Avoid cooling air short circuit using air barriers, if necessary
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Figure 3-1 Air barriers for avoiding cooling air short circuits
7. Provide an adequate cubicle with sufficient air vent and suitable air strainer