Preventing Cavitation - Siemens SINAMICS S120 Equipment Manual

9.1.2

Preventing cavitation

The following applies to all cooling circuits:
● The cooling circuit must always be designed in such a way that the pressure
compensator is located on the suction side of the pump and as close as possible to the
pump (see Figure below).
● The minimum pressure on the suction side of the pump must be approximately 30 kPa
(0.3 bar), or the geodesic height from the reservoir to the pump suction side must be
>3 m.
● The pressure drop across a SINAMICS device must not exceed 150 kPa (1.5 bar) in
continuous operation, as the resultant increase in volumetric flow increases the risk of
cavitation and/or abrasion.
● The guidelines given in Chapter Cooling circuit configuring information (Page 248)
regarding series connections and maximum pressure must also be followed.
A Pressure drop, supply line
B Pressure drop, return line
C Pressure drop, SINAMICS with baffle plate
D Pressure drop, intake and return
E Pressure drop, hose
Figure 9-2 Arrangement of pressure compensator, component pressure drops
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
247