Commissioning The Cooling Circuit; Coolant For The Raw Water Circuit On The Plant Side; Coolant Properties - Siemens SINAMICS S120 Manual

Commissioning the cooling circuit

5.1

Coolant for the raw water circuit on the plant side

5.1.1

Coolant properties

The coolant must fulfill the following requirements over the long term.
Table 5- 1
Electrical conductivity
pH value
Total hardness
SK 4.3 (upper limit value of polymer phosphates
for untreated additional water)
Dissolved iron
Dissolved copper
Ortho phosphate
Chloride
Sulfate
Biological stress
SiO
Aluminum
Fluoride
Size of entrained particles
Permissible limit values for suspended particles in the cooling water: No deposits of solid
particles at ≥0.5 m/s
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.
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
Requirements relating to the coolant (basis VDI 3803)
as silicic acid
2
Unit
µS/cm
°dH
mmol/l
mg/l
mg/l
mg/l
mg/l
mg/l
CFU/ml
mg/l
mg/l
mg/l
mm
5
Value
<2200
7.5 ... 9.0
<20 (T < 40 °C)
<10
<3.0
<0.2
<50
<180
<200
<50
<47
<2.65
<4.0
≤0.5
115