Siemens 1FT7 Series, Configuration Manual, Page: 58 / 252

Mechanical properties of the motors
3.2 Liquid cooling
1FT7 Synchronous Motors
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Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
Motor type Cooling power to be dissipated [W]
1FT7102-5WH7 1400
1FT7105-5WC7 1200
1FT7105-5WF7 1600
1FT7105-5WH7 1900
1FT7108-5WC7 1500
1FT7108-5WF7 1800
1FT7108-5WH7 1900
3.2.3 Coolant
Table 3- 7 Water specifications for coolant
Quality of the water used as coolant for motors with
aluminum, stainless steel tubes + cast iron or steel jacket
Chloride ions < 40 ppm, can be achieved by adding deionized water.
Sulfate ions < 50 ppm
Nitrate ions < 50 ppm
pH value 6 ... 9 (for aluminum 6 ... 8)
Electrical conductivity < 500 μS/cm
Total hardness < 170 ppm
Note
It is recommended to use deionized water with reduced conductivity (5 ... 10 µS/cm) (if
required, ask the water utility for the values). According to 98/83/EC, drinking water may
contain up to 2500 ppm of chloride!
Manufacturers of chemical additives can provide support when analyzing the water that is
available on the plant side.
Table 3- 8 Coolant quality
Coolant quality
Cooling water According to the table "Water specifications for cooling water"
Corrosion protection 0.2 to 0.25 % inhibitor, Nalco TRAC100 (previously 0GE056)
Anti-freeze protection When required, 20 - 30 % Antifrogen N (from the Clariant Company)
Dissolved solids < 340 ppm
Size of particles in the coolant < 100 μm