Siemens Sinamics S120 Manual page 342

Cooling circuit, coolant properties and protection against condensation
9.5 Examples of coolant control
Example of control of the coolant temperature depending on the relative humidity and the ambient
temperature
The temperature correction value delta T
maintain the temperature setpoint (T
humidity plus 4° C above the dew point.
Coolant temperature setpoint = ambient temperature + Δ TL
Table 9- 9 ΔT depends on the humidity
L
Relative humidity [%]
[° C]
1)
Delta T [° C]
2)
L
Temperature difference to the dew point
1)
Condensation point, plus 4 °C
2)
If delta T
coolant temperature.
Figure 9-20
342
20 30 40
25 18 15
-21 -14 -11
(ΔT ) is now added to the ambient temperature this provides the setpoint for the
L L
Examples of the minimum coolant temperature setpoint depending on the humidity of 20,
30 and 40° C ambient temperature (dew point plus 4° C)
(ΔT ) is added to the ambient temperature to
L L
) for the coolant. The value depends on the relative
set
50 60 70
12 9 7
-8 -5 -3
80 85 90
4 3 2
0 +1 +2
Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7
95 100
1 0
+3 +4