Siemens SIMOTICS T-1FW3, Configuration Manual

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Mechanical properties
3.1 Cooling
1FW3 complete torque motors
Configuration Manual, 08/2020, A5E46027705B AA
47
3.1.3 Cooling water
Table 3- 6 Water specification as coolant
Quality of the water used as coolant for motors with alumi-
num, 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 (with aluminum 6 ... 8)
Electrical conductivity < 500 μ S/cm
Total hardness < 170 ppm
Dissolved solids < 340 ppm
Size of entrained particles < 100 μ m
Corrosion protection 0.2 ... 0.25% inhibitor Nalco TRAC100 (previously 0GE056)
Anti-freeze protection If necessary 20 ... 30% Antifrogen N (manufacturer Clariant)
Biocide
The risk of corrosion caused by microbes is virtually non-existent in chlorinated drinking
water systems.
Closed cooling circuits with soft water are susceptible to microbes.
The following types of microbes are encountered in practice:
● Slime-forming bacteria
● Corrosive bacteria
● Iron-depositing bacteria
The suitability of a biocide depends on the type of microbe.
● Analyze the cooling water for microbes at least once a year.
Necessary biocides can be obtained from the manufacturer, e.g. Nalco. Ask the
manufacturer for compatibility with an inhibitor used in your system.
● Dose the biocide as recommended by the manufacturer.
Antifrogen N already acts like a biocide at the minimum concentration of > 20%.
Note
Compatibility of coolant additives
Biocides and Antifrogen N must not be mixed.
There are other manufacturers of chemical additives in the market. You can use equivalent
products from other manufacturers. Have the suitability of the third-party products
determined.