SIEMENS
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Siemens D 21.4 · 2017
SINAMICS S120 drive system
Chassis format
Liquid-cooled units in chassis format
7
■
Technical specifications
(continued)
Cooling circuit and coolant quality
The following tables and sections describe the quality require-
ments of the coolant used in the liquid-cooled SINAMICS S120
drive system in chassis format.
Antifreeze and inhibitors
Biocides prevent corrosion that is caused by slime-forming,
corrosive or iron-depositing bacteria. These can occur in closed
cooling circuits with low water hardness and in open cooling
circuits. Biocides must always be selected according to the
relevant bacterial risks. Compatibility with inhibitors or antifreeze
used with them must be checked on a case-by-case basis.
Recommended service
The manufacturer of the antifreeze/inhibitor should analyze
the coolant at least once per annum. The concentration and
boundary conditions of the antifreeze/inhibitor should be
checked. It may be necessary to correct the concentration
on the plant side.
Cooling circuit
• System pressure with reference to
atmospheric pressure, max.
600 kPa
• Pressure drop at rated volumetric flow
70 kPa
• Recommended pressure range
80 ... 200 kPa
• Inlet temperature of liquid coolant
Dependent on ambient temperature, no condensation permitted
0 ... 45 °C (32 ...113 °F) without derating
>45 … 50 °C (113 ... 122 °F),
see derating data
Anti-freeze essential for temperature range between 0 °C (32 °F) and 5 °C (41 °F)
Coolant quality
• Coolant basis for aluminum heat sinks
Distilled, demineralized, completely desalinated water or deionized water with reduced electrical conductivity
ISO 3696, quality 3 or based on IEC 60993
-
Electrical conductivity
<30
μ
S/cm (3 mS/m)
-
pH value
5 ... 8
-
Components that can be oxidized
as oxygen content
< 30 mg/l
-
Residue after vaporization and
drying at 110 °C
<10 mg/kg
• Coolant basis for stainless steel
heat sinks
Filtered drinking water
-
Electrical conductivity
<2000
μ
S/cm
-
pH value
6.5 ... 9
-
Chloride ions
<200 mg/l
-
Sulfate ions
<240 mg/l
-
Nitrate ions
< 50 mg/l
-
Total hardness
< 1.7 mmol/l
-
Dissolved substances
< 340 mg/l
-
Size of entrained particles
< 100
μ
m
The coolant definition specified here should only be considered as recommendation. For units that have been
shipped, the information and data provided in the equipment manual supplied should be observed!
Antifreeze
Antifrogen N
Antifrogen L
DOWCAL 100
Manufacturer
Clariant
Clariant
DOW
Chemical base
Ethylene glycol
Propylene glycol
Ethylene glycol
Minimum concentration
20 %
25 %
20 %
Anti-freeze agent with minimum
concentration
-10 °C
-10 °C
-10 °C
Maximum concentration
45 %
48 %
44 %
Anti-freeze agent with maximum
concentration
-30 °C
-30 °C
-30 °C
Inhibitor content
Contains inhibitors with nitrites
Contains inhibitors that are free of
nitrates, amines, borates and
phosphates
Contains inhibitors that are free of
nitrates, amines and phosphates
Biocide action with a concentration of
> 20 %
> 30 %
> 20 %
Inhibitors
Antifrogen N
ANTICORIT S 2000 A
Manufacturer
Clariant
Fuchs
Chemical base
Ethylene glycol
–
Minimum concentration
20 %
4 %
Maximum concentration
45 %
5 %
© Siemens AG 2017