Coolant Definition; Coolant Properties - Siemens SINAMICS S120 Equipment Manual

Cooling circuit, coolant properties and protection against condensation

9.2 Coolant definition

9.2 Coolant definition
9.2.1

Coolant properties

The coolant must fulfill the following requirements over the long term.
For ambient temperatures below +5 °C, antifreeze must be added to the coolant, see
Antifreeze + biocide (Page 262).
Table 9- 2 Coolant requirements
Basis coolant
pH value
Electrical conductivity
Total salt content TDS
Chloride ions
Sodium
Sulfate ions
Sulfide ions
Nitrate ions
Iron
Silicate
Ammonia (NH ),
3
ammonium (NH )
4 +
Total hardness
of which, maximum:
- calcium hardness
- magnesium hardness
- carbonate hardness
Suspended solids / sus-
pended substances:
- solids
- size of entrained particles
260
Heat sink manufactured out of a copper-
nickel alloy
Filtered drinking, process and cooling water
with the following quality:
6.5 ... 9
< 2900 μS/cm
< 1800 mg/l
< 500 mg/l
< 200 mg/l
< 300 mg/l
< 1 mg/l
< 50 mg/l
< 1 mg/l
< 10 mg/l
< 1 mg/l
< 1.78 mmol/l (corresponds to 10 °dH)
< 1.25 mmol/l (corresponds to 7 °dH or 50 mg/l calcium)
< 1.43 mmol/l (corresponds to 8 °dH or 35 mg/l magnesium)
< 0.45 mmol/l earth alkali equivalent (corresponds to 2.5 °dH)
That corresponds to < 0.9 mmol/l hydrogen carbonate (HCO
(CO ).
3 2-
< 340 mg/l
< 100 μm
Stainless steel heat sink
Filtered drinking, process and cooling water
with the following quality:
6.5 ... 9
< 2500 μS/cm
< 1550 mg/l
< 250 mg/l
< 200 mg/l
< 240 mg/l
< 1 mg/l
< 50 mg/l
< 1 mg/l
< 10 mg/l
< 1 mg/l
) or < 0.45 mmol/l carbonate
3-
< 340 mg/l
< 100 µm
Water-cooled chassis power units for common cooling circuits
Manual, 08/2017, 6SL3097-4AM10-0BP0