Prevention Of Cavitation - Siemens SINAMICS S120 Equipment Manual

Cooling circuit and coolant properties
8.1 Cooling circuits
8.1.3

Prevention of 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 Fig. 8-3).
• The minimum pressure on the suction side of the pump must be approximately 30 kPa, or
the geodesic height from the reservoir to the pump suction side must be >3 m.
• The pressure drop across a SINAMICS unit must not exceed 200 kPa in continuous
operation, as the resultant increase in volumetric flow increases the risk of cavitation
and/or abrasion.
• The guidelines given in Subsection 8.1.4 regarding series connections and maximum
pressure must also be followed.
Surge tank
Höhe >3 m
Inspection glass
Dirt trap
Fig. 8-3 Arrangement of pressure compensator, component pressure drops
8-6
DP SINAMICS
with cover
DP hose
DP infeed
DP return
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
SINAMICS
Chassis Power Units Liquid Cooled
DP inlet/
return