Cooling Water Requirements - Siemens SINAMICS S120 Equipment Manual

Internal Liquid Cooling

10.2 Cooling water requirements

10.2 Cooling water requirements
Properties of the cooling medium
Water or a water/anti-freeze mixture that meets the relevant requirements can be used as a
cooling medium. The cooling medium must be chemically neutral, clean, and not contain any
solids.
The cooling water must fulfill the following requirements over the long term:
● Chemically neutral, clean, and free of solids
● Max. inlet temperature: 40°C
● Max. outlet temperature: 50°C
● Operating pressure: 1 bar to 6 bar
● Max. size of any conveyed particles: 0.1 mm
● pH value: 6.0 to 8.0
● Chlorides < 40 ppm
● Sulfates < 50 ppm
● Loose materials < 340 ppm
● Total hardness < 170 ppm
● Conductivity value < 500 µs/cm
Note
Normal tap water does not generally fulfill these requirements,
de-ionized water.
The operating pressure must not exceed 6 bar.
A particle filter (particle size < 100 µm) must be installed in the cooling water circuit.
If there is a risk of frost, preventive measures must be taken during operation, storage, and
transportation (e.g. emptying and blowing out with air, additional heating).
The cooling water should be checked 3 months after the cooling circuit is filled for the first
time and, subsequently, once a year. If the cooling water becomes cloudy, is colored, or
becomes contaminated by mould spores, the cooling circuit must be cleaned and refilled.
An inspection glass should be provided in the cooling circuit to make it easier to check the
cooling water.
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although it can be mixed with de-ionized water. Losses must always be replenished with
NOTICE
The heat sink is made of non-seawater-proof material, which means that it must not be
cooled directly with seawater.
NOTICE
Condensation must not be allowed to form on the SINAMICS S120 equipment as a
result of supercooling. The temperature of the cooling water may have to be regulated.
Booksize cold-plate power units
Manual, (GH4), 03.2007, 6SL3097-2AJ00-0BP4