Power Losses And Air Cooling Requirements - Siemens SINAMICS G12 Hardware Installation Manual

Installing/mounting

4.3 Power losses and air cooling requirements

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 Power Modules with push-through technology - PT devices
When you use PT Power Modules, the majority of the power loss is dissipated through the
heatsink located outside the control cabinet.
32
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 data (Page 73)".
less than 0.04 kW.
components, for example
reactors or filters
Hardware Installation Manual, 08/2017, A5E33294624B AG
Power Module PM240-2