Siemens SIMOTICS M-1PH8 - Commissioning

Note
Inhibitor (for Cooling water speci󹪝cations tables)
The inhibitor is not required if it ensured that the concentration of Antifrogen N is > 20%.
Derating is required for an anti-freeze content of > 30%
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.
Other coolants (not water-based)
If you use di󹪜erent cooling media (e.g. oil, cooling lubricant), derating may be necessary in order
to comply with the thermal motor limit.
Note
Derating when using other cooling lubricants
Derating is required for water-oil mixtures with more than 10% oil.
Mechanical properties
4.1Cooling
1PH8 SIMOTICS M main motors
Con󹪝guration Manual, 12/2022, A5E51895839A 81