Cooling Water Requirements - Siemens SINAMICS S120 Equipment Manual

Internal Liquid Cooling

9.2 Cooling water requirements

9.2 Cooling water requirements
9.2
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 < 500 µs/cm
9-2
Note
Normal tap water does not generally fulfill these requirements, although it can be mixed
with de-ionized water. Losses must always be replenished with de-ionized water.
The operating pressure must not exceed 6 bar.
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.
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2