Plant-Specific Settings; Anti-Condensation Measures - Siemens SINAMICS S120 Manual

Commissioning the cooling circuit

5.5 Plant-specific settings

5.5 Plant-specific settings
The Heat Exchanger Module is controlled with its own software via a Control Unit CU320-2
integrated in the drive system.
This controls the pump and uses the 3-way valve actuator drive to regulate the intake
temperature in the converter deionized water circuit to a fixed, adjustable value.
The control system also monitors the pressures in the intake and return flow lines of the
deionized water circuit, the intake temperature in the deionized water circuit and the ambient
temperature. Alarm or fault messages are output if the measured values exceed or fall below
the limits stored internally in the control system.
The control software also includes a function to automatically avoid condensation.
Connection with Control Unit
To integrate the Heat Exchanger Module, you must establish a DRIVE-CLiQ connection
between the Control Unit and the TM31 Terminal Module in the control box of the Heat
Exchanger Module.
Adjust the ball valve to reduce the pressure at the intake of the converter-side deionized water circuit.
Adjust the ball valve to reduce the pressure at the intake of the converter-side deionized
water circuit (77.3) to "half open" in order to prevent the release valve (63.1) from being
triggered during the commissioning phase.
Further information
A description of the functions and operation is provided in the separate documentation "Heat
Exchanger Module Function Manual ". This is provided on the DVD included in the scope of
supply.
5.6

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 normally occurs at the intake connection of the devices.
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.
134
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A