Coolant Definition - Siemens SINAMICS S120 Equipment Manual

8.2

Coolant definition

The coolant must fulfill the following requirements over the long term.
Table 8-4 Coolant definition
Basic coolant mix Deionized water with reduced conductivity
(5...10 μS/cm), e.g. "battery water"
with 0.2 % Nalco inhibitor 00GE056 (made by:
Nalco) or Antifrogen N with a proportion X of
20% < X ≤ 45% (made by: Clariant)
or filtered drinking/urban water with 0.2 % Nalco
inhibitor 00GE056 (made by: Nalco) or
Antifrogen N with a proportion X of 20% < X ≤
45% (made by: Clariant) of the quality specified
below:
Chloride ions < 40 ppm
Can be obtained by adding deionized water.
Sulfate ions < 50 ppm
Nitrate ions < 50 ppm
pH value 5.5 – 8.0
Conductivity < 500 μS/cm
Total hardness < 170 ppm
Dissolved solids < 340 ppm
Size of entrained < 100 µm
particles
Warning
According to Directive 98/83/EC, drinking water may contain up to 250 ppm of chloride!
This value is too high for the heatsinks which may sustain serious damage if inhibitors are
not added!
Note
We recommend that use is made of Nalco's services (Manufacturer: Nalco) for analyzing the
water quality at the plant site.
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
Coolant quality
for aluminum heatsink (see Table 8-1)
Cooling circuit and coolant properties
Coolant quality
for stainless steel heatsink (see Table 8-1)
Filtered drinking/urban water of the quality
specified below:
< 250 ppm
< 240 ppm
< 50 ppm
6.5 - 9.5
< 2500 μS/cm
< 170 ppm
< 340 ppm
< 100 µm
8.2 Coolant definition
8-13