Description
3.4 Structure
1FT7 synchronous motors
Operating Instructions, 04/2010, 610.40075.40b
21
Table 3- 6 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 to 8)
Electrical conductivity < 500 μS/cm
Total hardness < 170 ppm
Note
It is recommended to use deionized water with reduced conductivity (5 to 10 µS/cm) (if
necessary, ask the water utility for the values). According to Directive 98/83/EC, drinking
water may contain up to 2,500 ppm of chloride!
Manufacturers of chemical additives can provide support when analyzing the water that is
available on the plant side.
Table 3- 7 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 entrained particles < 100 μm
Note
The inhibitor is not required if it is ensured that the concentration of Antifrogen N is > 20%.
Derating is not required for an anti-freeze protection component < 30%.
NOTICE
Storing or transporting the motor
The cooling circuit must be emptied when storing the motor, when the motor is out of
service for a long period, and when the motor is being transported.
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