Anti-Freeze Additive - Siemens SINAMICS S120 Equipment Manual

A particle filter (particle size < 100 µm) must be installed in the cooling water circuit.
If there is a risk of frost, preventive measures must be taken during operation, storage, and
transportation (e.g. emptying and blowing out with air, additional heating).
The cooling water should be checked 3 months after the cooling circuit is filled for the first
time and, subsequently, once a year. If the cooling water becomes cloudy, is colored, or
becomes contaminated by mould spores, the cooling circuit must be cleaned and refilled.
An inspection glass should be provided in the cooling circuit to make it easier to check the
cooling water.
9.3

Anti-Freeze Additive

9.3
Antifrogen N (Clariant; ) is recommended as an antifreeze. The proportion of anti-freeze
must be between 20% and 30%. This ensures frost protection in temperatures of at least
-10°C.
Notice
If the proportion of anti-freeze is greater than 30%, this can inhibit the transfer of heat and
prevent the equipment from functioning correctly.
Note
You must always bear in mind that the kinematic viscosity of the cooling water changes
when anti-freeze is added, which means that the pump power must be adjusted accordingly.
Notice
Cooling water mixtures with Antifrogen N are highly conductive. In the event of leakage, the
insulating systems must be cleaned.
Notice
When EPDM hoses are used, oily corrosion inhibitor additives must not be used because
additives can corrode and destroy EPDM.
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2
Internal Liquid Cooling
9.3 Anti-Freeze Additive
9-3