Siemens SINAMICS S120 - Page 775

Cooling circuit and coolant properties
13.1 Cooling circuit requirements
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
775
The characteristic curves for the pressure drop across the heatsinks as a function of
volumetric flow vary depending on the temperature and the Antifrogen N / water coolant mix.
Figure 13-3 Pressure difference as a function of volumetric flow
Operating pressure
The
operating pressure
must be set according to the flow conditions in the supply and return
lines of the cooling circuit. The required coolant flow rate per time unit must be set according
to the technical data of the components. The components are normalized to a rated pressure
of 70 kPa (for coolant type H
2
O) via a baffle plate.
Layout of the components
The components should be arranged in the system in such a way that the overall length of
the supply and discharge lines is the same for every SINAMICS component.
Water cooling systems with series-connected SINAMICS devices are not permitted.