Anti-Condensation Measures - Siemens Sinamics S120 Manual

Note
Checking the hose lines
The inspection intervals depend on the prevailing ambient conditions.
The following points should be noted for the coolant hoses:
• Damage through abrasion points
• Embrittlement (e.g. forming of cracks)
• Leaks
• The hose slipping out of the coupling
• Deformations that do not comply with the natural shape of the hose (e.g. separation of
layers and blistering)
• Exceeding the storage and use times
In accordance with the accepted rules and standards, we recommend a testing cycle of
five years with the appropriate test pressure (twice the operating pressure).
9.4

Anti-condensation measures

The customer must take measures to protect the devices against condensation.
If condensation occurs in the device, it must be de-energized and dried before switching on
again.
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 drops out is referred to as the "dew point".
The table below shows the dew points (in °C) for an atmospheric pressure of 1 bar
(≈ 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.
The coolant temperature must be controlled according to the following table.
Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7
Cooling circuit, coolant properties and protection against condensation
9.4 Anti-condensation measures
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