Siemens SINAMICS G120P PM330 Installation Manuals page 21

Cooling requirements
Depending on the power losses of the various components a specific cooling air flow is
required to protect the components from overheating. The following equation shows you how
to calculate the required air flow.
1. Add the power losses of the individual components.
2. Calculate the air flow required, using the formula.
3. Ensure that the air intake and air discharge openings are adequately large so that the
pressure drop in the cabinet at the required cooling air flow rate (for the Power Modules,
see Specific technical data (Page 70)) remains ≤100 Pa, even when filter mats are used.
4. Ensure that no equipment is mounted that has a negative impact on the cooling air flow.
5. Ensure that the air openings in the Power Modules are free so that the airflow is not
obstructed (for the necessary clearances, see Chassis units (Page 25)).
6. Avoid possible short-circuits in the airflow (= air circulates within the cabinet) by using the
appropriate partitions, e.g. by using an air discharge duct up to the roof panel (see
position
When converter cabinets are lined up next to one another, then these cabinets must be
separated from the adjacent cabinets using intermediate walls or panels.
Figure 3-1
Power Module PM330
Hardware Installation Manual, 10/2016, A5E32844552B AD
①
in the following diagram).
Example of an air discharge duct
3.2 Power losses and air cooling requirements
Installing/Mounting
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