Siemens SINAMICS S120 Equipment Manual page 240

Cooling circuit and coolant properties
8.1 Cooling circuits
Figure 8-10 Pressure drop as a function of volumetric flow for Active Line Module and Motor Module, frame size JXL
Recommendation for dimensioning the cooling circuit:
The differential pressure between the supply and return lines should be selected such that
the following applies:
The individual pressure drops Pi represent the pressure drops of components (heat
exchanger, piping, 70 kPa for the SINAMICS units connected in parallel, valves, dirt traps,
pipe bends, etc.).
The greatest care must be taken when routing pipes. The pipes must never come into
contact with electrically live components; an insulation clearance of >13 mm must always be
left between pipes and live parts! The pipes must be securely mounted and checked for
leaks.
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Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1