Power Losses And Air Cooling Requirements - Siemens SINAMICS G120 Hardware Installation Manual

4.2

Power losses and air cooling requirements

Cooling requirements
To protect the components from overheating, the control cabinet requires a cooling air flow,
which depends on the power loss of the individual components.
Formula for calculating the cooling airflow:
• Power loss:
• Δ T:
Measures in order to ensure that the components are adequately cooled
• Add the power losses of the individ‐
ual components.
– Power Module data:
– The Control Unit power loss is
– Use the manufacturers data for
• Calculate the air flow required, us‐
ing the formula above.
• Ensure that the control cabinet is
appropriately ventilated and equip‐
ped with suitable air filters.
• Ensure that the components main‐
tain the specified clearances with
respect to one another.
• Ensure that the components are provided with adequate cooling air through the cooling
openings.
• Use the appropriate air barriers to prevent cooling air short circuits
PM250 Power Module
Hardware Installation Manual, 04/2021, A5E36265179B-AB
airflow [l/s] = power loss [W] * 0.86 / ΔT [K]
Total of the power losses of the individual components.
Permissible temperature rise in the control cabinet
"Technical specifications
(Page 53)".
less than 0.04 kW.
components, for example reac‐
tors or filters
4.2 Power losses and air cooling requirements
Installing/mounting
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