Preventing Cavitation - Siemens Sinamics S120 Manual

Cooling circuit, coolant properties and protection against condensation
9.1 Cooling circuits
9.1.3

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 200 kPa (2 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 317)
regarding series connections and maximum pressure must also be followed.
Figure 9-3 Arrangement of pressure compensator, component pressure drops
316
Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7