Power Losses And Air Cooling Requirements; Measures In Order To Ensure That The Components Are Adequately Cooled - Siemens SINAMICS G120XA Operating Instructions Manual

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3.2 Power losses and air cooling requirements

3.2 Power losses and air cooling requirements
Overview
To protect the components from overheating, the control cabinet requires a cooling air flow,
which depends on the power loss of the individual components.

Measures in order to ensure that the components are adequately cooled

● Add the power losses of the individual components.
–
– Use the manufacturers' data for components, for example reactors or filters.
● Calculate the air flow required:
airflow [l/s] = power loss [W] * 0.86 / ΔT [K]
Power loss: Total of the power losses of the individual components.
Δ T: Permissible temperature rise in the control cabinet.
● 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.
● Ensure that the electrical cabinet is adequately ventilated and is equipped with suitable air
filters.
Comply with the replacement intervals of the air filter.
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Technical data dependent on the power (Page 866)
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
SINAMICS G120XA converter