Cooling Circuit For Stainless Steel Heat Sinks - Siemens Sinamics S120 Manual

9.1.2

Cooling circuit for stainless steel heat sinks

To ensure an optimum heat sink service life, please note the following specification for the
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
a cooling system via a water-to-water heat exchanger.
● Cooling circuit pipes, fittings made of stainless steel (Nirosta) or steel (ST37) with
antifreeze in the coolant.
Figure 9-2 Recommendation for open circuit
Note
Requirements regarding the coolant reservoir
It must be guaranteed that the coolant is cooled down in the coolant reservoir.
Note
Arrangement of the devices in the cooling circuit
When arranging the devices in the cooling circuit, please note that the SINAMICS S120
devices must always be positioned upstream of the motors.
Dirt traps (strainer) with a mesh width ≤100 µm, at least one pressure measuring point and a
sight class are important for service.
The customer must take measures (e.g. by monitoring the level) that the level in the coolant
reservoir does not fall below a certain height.
Air bubbles in the coolant can cause the device to overheat. Information on venting is
provided in Chapter "Commissioning (Page 345)".
Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7
Cooling circuit, coolant properties and protection against condensation
9.1 Cooling circuits
315