Cooling Circuit For Stainless Steel Heat Sinks; Preventing Cavitation - Siemens SINAMICS S120 Equipment Manual

Cooling circuit and coolant properties
8.1 Cooling circuits
8.1.2

Cooling circuit for stainless steel heat sinks

To ensure an optimum heat sink service life, please note the following recommendation for
stainless steel heat sinks (Power Modules FL and GL, Active Line Modules GXL, Motor
Modules FXL and GXL):
● Open or semi-open cooling circuit made of stainless steel or ABS which transfers heat to
● Cooling circuit pipes, fittings made of stainless steel (Nirosta) or common steel (ST37).
Figure 8-2
8.1.3

Preventing cavitation

The following applies to all cooling circuits:
● The cooling circuit must always be designed in such a way that the pressure
● The minimum pressure on the suction side of the pump must be approximately 30 kPa, or
● The pressure drop across a SINAMICS unit must not exceed 200 kPa in continuous
● The guidelines given in the Subsection "Cooling circuit configuring information" below
230
a recooling system via a water-to-water heat exchanger.
P
Recommendation for open circuit
compensator is located on the suction side of the pump and as close as possible to the
pump (see Figure below).
the geodesic height from the reservoir to the pump suction side must be >3 m.
operation, as the resultant increase in volumetric flow increases the risk of cavitation
and/or abrasion.
regarding series connections and maximum pressure must also be followed.
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1