Siemens SINAMICS S120 Equipment Manual page 244
Chassis liquid cooled power units
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- Function manual (1094 pages) ,
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Cooling circuit and coolant properties
8.2 Coolant definition
Inhibitor without anti-freeze effect
The NALCO TRAC100 inhibitor (made by: Nalco) must always be used in a mixing ratio of
0.2 % to 0.25 %.
Inhibitors can be used only in water with the properties defined in Section "Coolant definition"
which must not contain any magnesium carbonate.
Control kits can be ordered from Nalco to check the inhibitor concentration.
Anti-freeze protection
Antifrogen N (Manufacturer: Clariant) with a proportion X of 20 % < X ≤ 45 % is the anti-
freeze used. Coolants containing 45 % Antifrogen N are anti-freeze-protected down to
-30 °C.
Antifrogen N contains anti-corrosion inhibitors which permanently protect the metal in the
cooling system against corrosion.
It is particularly important to ensure that the proportion of Antifrogen N is always >20 % when
a system is refilled, otherwise the mixture becomes corrosive.
Inhibitors and Antifrogen N must not be mixed.
Biocide
Closed cooling circuits with soft water (°DH>4) are susceptible to microbes. The risk of
corrosion caused by microbes is virtually non-existent in chlorinated drinking water systems.
No strain of bacteria can survive if >20 % Antifrogen N is added.
The following types of bacteria are encountered in practice:
● Slime-forming bacteria
● Corrosive bacteria
● Iron-depositing bacteria
The type of bacteria determines the suitability of a biocide. At least one water analysis per
annum (to determine the number of bacterial colonies) is recommended. Suitable biocides
are available from the manufacturer Nalco for example.
Note
The type of bacteria determines the biocide.
The manufacturer's recommendations must be followed as regards the dosage and
compatibility with any inhibitor used.
Biocides and Antifrogen N must not be mixed.
Antifrogen N has a biocidal effect even at the minimum required concentration of >20 %.
242
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1
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