Siemens SINAMICS S120 Equipment Manual page 29

Boundary conditions for use
The Power Modules, Active Interface Modules, Active Line Modules and Motor Modules are
designed for connection to a liquid coolant circuit which must be provided by the customer.
The design of this cooling water circuit is an important factor in determining the operational
reliability and service life of the equipment and the entire installation.
The main criteria are described in the following chapters.
Advantages of water cooling over air cooling
Water cooling dissipates heat much more efficiently than air cooling. As a result, water-
cooled units are much more compact than air-cooled units with the same power rating. Since
the heat losses generated by the electronic components are almost completely dissipated by
the cooling water, only very small cooling fans are required. This means that the devices are
quiet in operation. Due to their compact dimensions and almost negligible cooling air
requirement, water-cooled units are the preferred solution wherever installation space is
restricted and/or the ambient operating conditions are rough. With water cooling, closed
electrical cabinets with degrees of protection up to IP55 can be easily implemented.
Water-cooled chassis power units for common cooling circuits
Manual, 08/2017, 6SL3097-4AM10-0BP0
System overview
2.2 SINAMICS S120 drive system
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