Siemens SINAMICS S120 Equipment Manual page 213

10.7 Water-to-water heat exchanger
If a cooling circuit that does not exceed 35°C but does not fulfill the cooling water
requirements is already installed in the system, the two cooling circuits can be linked via a
water-to-water heat exchanger.
The coolers for the frequency converters are attached via a distributor in such a way as to
ensure the required flow without exceeding the required pressure. Conditions, such as height
differences and distances, must be taken into account here.
For devices without frost protection, we recommend you use VARIDOS TOP from Schilling
Chemie. VARIDOS TOP is an organic corrosion inhibitor that has been specially developed
for half-open and closed cooling systems. It prevents corrosion by creating an organic
protective film on the surface of the metal.
Figure 10-1
Booksize cold-plate power units
Manual, (GH4), 03.2007, 6SL3097-2AJ00-0BP4
Water-to-water heat exchanger
Internal Liquid Cooling
10.7 Water-to-water heat exchanger
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