Coolant Definition - Siemens SINAMICS S120 Equipment Manual

Cooling circuit and coolant properties

8.2 Coolant definition

8.2 Coolant definition
8.2.1 Coolant definition
The coolant must fulfill the following requirements over the long term.
Table 8- 3 Coolant definition
Basic coolant mix Deionized water with reduced conductivity
(5 ... 10 μS/cm), e.g.
•
•
Chloride ions < 40 mg/l
Can be obtained by adding deionized water.
Sulfate ions < 50 mg/l
Nitrate ions < 50 mg/l
pH value 5.5 – 8.0
Conductivity < 500 μS/cm
Total hardness < 1.7 mmol/l
Dissolved solids < 340 mg/l
Size of entrained < 100 µm
particles
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 which may sustain serious damage if inhibitors are
not added!
Note
We recommend that use is made of Nalco's service for analyzing the water quality at the
plant site (manufacturer: Nalco).
240
Coolant quality
for aluminum heat sink
"battery water" with 0.2 % Nalco inhibitor
TRAC100 (made by: Nalco) or Antifrogen N
with a proportion X of 20 % < X ≤ 45 %
(made by: Clariant)
or filtered drinking/municipal water with 0.2 %
Nalco inhibitor TRAC100 (made by: Nalco) or
Antifrogen N with a proportion X of 20 % < X
≤ 45 % (made by: Clariant) of the quality
specified below:
WARNING
Coolant quality
for stainless steel heat sink
Filtered drinking/municipal water of the quality
specified below:
< 200 mg/l
< 240 mg/l
< 50 mg/l
6.5 – 9.0
< 2000 μS/cm
< 1.7 mmol/l
< 340 mg/l
< 100 µm
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1