Installing/mounting
4.2 Power losses and air cooling requirements
PM250 Power Module
20 Hardware Installation Manual, 01/2016, A5E36265179B-AA
Additional requirements for CSA compliance:
Install the inverter with an external suppression device with the following properties:
● Surge voltage protection device - Recognized Component XUHT2
● Rated voltage 480 V (phase with respect to ground), 480 V (phase to phase)
● Terminal voltage, V
PR
= 2000 V
● Suitable for SPD applications, type 1 or type 2
Alternatively, use a surge protection device, article number 5SD7 424-1 from Siemens AG.
Power losses and air cooling requirements
Cooling requirements
Depending on the power loss of the individual components, the control cabinet will require a
cooling airflow to prevent the components from overheating.
Formula for calculating the cooling airflow:
Power loss:
al of the power losses of the individual components.
Δ T
Permissible temperature rise in the electrical cabinet
Measures in order to ensure that the components are adequately cooled
1. Add the power losses of the individual components.
– Power Module data:
"Technical specifications (Page 53)".
– The Control Unit power loss is less than 0.04 kW.
– Use the manufacturers data for components, for example reactors or filters
2. Calculate the air flow required, using the formula above.
3. Ensure that the control cabinet is appropriately ventilated and equipped with suitable air
filters.
4. Ensure that the components have the specified clearances with respect to one another.
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