Siemens Sinamics S120 Manual page 333

NOTICE
Damage to the device through a high percentage of chloride in drinking water
According to Directive 98/83/EC, drinking water may contain up to 250 mg/l of chloride!
This value is too high for the heat sinks, the heat sinks can be damaged!
• Only use drinking water with a chloride percentage permissible for the heat sink.
Note
Suitable cooling water
Distilled, demineralized water, also known as deionized water, completely desalinated water
(VE water) or Deionat, is not suitable by itself as coolant.
It can be used as basis when using antifreeze.
Note
Analyzing the liquid coolant
It is recommended that you contact the coolant manufacturer to analyze the liquid coolant.
The coolant 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 mold spores,
the cooling circuit must be cleaned and refilled.
Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7
Cooling circuit, coolant properties and protection against condensation
9.2 Coolant definition
333