Siemens SINAMICS S120 Equipment Manual page 130

Cooling circuit and coolant properties
8.1 Cooling circuits
Fig. 8-4 Differential pressure as a function of volumetric flow
Water cooling systems with series-connected SINAMICS units cannot be recommended for
the following reasons:
• The risk of cavitation and abrasion increases as a result of the high total volumetric flow.
• It is not possible to connect SINAMICS S120 in series because the total volumetric flow
The characteristic curves for the pressure drop across the heatsinks as a function of the
volumetric flow in Fig. 8-5 to Fig. 8-10 vary depending on the temperature and the Antifrogen
N / water coolant mix.
8-8
inherent to any constellation of series connection requires system pressures in the
600 kPa range or above.
SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
Chassis Power Units Liquid Cooled