Siemens SINAMICS S120 Equipment Manual page 249

The devices can be operated with a coolant based on filtered drinking water, which complies
with the requirements specified in Chapter "Coolant properties (Page 260)".
For ambient temperatures below +5 °C, antifreeze must be added in order to prevent the
coolant freezing in the cooling circuit.
The characteristic curves for the pressure drop across the heat sinks as a function of the
volumetric flow vary depending on the temperature and the antifreeze and water coolant
combination, as can be seen in the following figures.
Coolant mixture comprising Antifrogen N or Dowcal 100 and water
The following diagrams show the pressure drop as a function of the volumetric flow rates for
the different SINAMICS S120 water-cooled components when using Antifrogen N or Dowcal
100.
Dowcal 100 has the same flow attribute as Antifrogen N.
Figure 9-4 Pressure drop as a function of volumetric flow for Power Module frame size FL, and Motor Module frame size
FXL
Water-cooled chassis power units for common cooling circuits
Manual, 08/2017, 6SL3097-4AM10-0BP0
Cooling circuit, coolant properties and protection against condensation
9.1 Cooling circuits
249