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

4.3

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
individual components.
– Power Module data:
– The Control Unit power loss is
– Use the manufacturers data for
● Calculate the air flow required,
using the formula above.
● Ensure that the control cabinet is
appropriately ventilated and
equipped with suitable air filters.
● Ensure that the components
maintain 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
Power loss for modules in push-through technology (PT Power Modules)
When you use PT Power Modules, the majority of the power loss is dissipated through the
heatsink located outside the control cabinet.
Power Module PM230, IP20 / Push-through technology (PT)
Hardware Installation Manual, 08/2016, A5E34331322B 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
"Detailed technical data
(Page 64)".
less than 0.04 kW.
components, for example
reactors or filters
4.3 Power losses and air cooling requirements
Installing/mounting
29