Siemens 6SL3210-1SE14-1UA0 [284/318] Anti condensation measures

Siemens 6SL3210-1SE31-0AA0 [284/318] Anti condensation measures
Cooling circuit and coolant properties
10.3 Anti-condensation measures
Manual
284 Manual, 01/2011, 6SL3097-4AC10-0BP2
10.3 Anti-condensation measures
The customer must take measures to protect the devices against condensation.
Condensation occurs when the inlet temperature of the coolant is significantly lower than
room temperature (ambient temperature). The permissible temperature difference between
coolant and air varies as a function of the relative humidity φ of the ambient air. The air
temperature at which the aqueous phase precipitates is referred to as the "dew point".
The table below shows the dew points (in °C) for an atmospheric pressure of 100 kPa
(≈ installation altitude: 0 to 500 m). If the temperature of the coolant is below the specified
value, condensation may occur (i.e. the coolant temperature must always be ≥ the dew point
temperature).
Table 10- 2 Dew point temperature as a function of relative air humidity φ and room temperature at an installation altitude
of 0 m.
T room
[°C]
Φ=20% Φ=30% Φ=40% Φ=50% Φ=60% Φ=70% Φ=80% Φ=85% Φ=90% Φ=95% Φ=100%
10 <0 <0 <0 0.2 2.7 4.8 6.7 7.6 8.4 9.2 10
20 <0 2 6 9.3 12 14.3 16.4 17.4 18.3 19.1 20
25 0.6 6.3 10.5 13.8 16.7 19.1 21.2 22.2 23.2 24.1 24.9
30 4.7 10.5 14.9 18.4 21.3 23.8 26.1 27.1 28.1 29 29.9
35 8.7 14.8 19.3 22.9 26 28.6 30.9 32 33 34 34.9
38 11.1 17.4 22 25.7 28.8 31.5 33.8 34.9 36 36.9 37.9
40 12.8 19.1 23.7 27.5 30.6 33.4 35.8 36.9 37.9 38.9 39.9
45 16.8 23.3 28.2 32 35.3 38.1 40.6 41.8 42.9 43.9 44.9
50 20.8 27.5 32.6 36.6 40 42.9 45.5 46.6 47.8 48.9 49.9
The dew point also depends on the absolute pressure (i.e. the installation altitude).
The dew points for low atmospheric pressure are lower than those at an altitude of 0 m (i.e. it
is always acceptable to calculate the coolant supply temperature for an altitude of 0 m).
For short periods of condensation in Power Modules PM340 Liquid Cooled, framed size
FSF, the condensate may be collected inside the components and removed by a hose (see
dimensional drawing).

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