Cooling System Requirements - Siemens SINAMICS S120 Manual
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Cooling circuit and coolant properties
13.1 Cooling circuit requirements
13.1.2
Cooling system requirements
Open cooling systems must never be used for liquid-cooled power units. A closed cooling
circuit with a membrane expansion tank, safety valve, and heat exchanger is recommended,
which connects the cooling circuit to an external cooler (refer also to Chapter Using heat
exchangers (Page 783)).
Requirements
● A particle filter (particle size < 100 µm) must be installed in the cooling circuit to prevent
foreign particles from being washed in.
● Mixed installations should be avoided wherever possible.
● The permissible pressures in the cooling system must be observed.
● Cavitation must be prevented in the cooling system.
● Equipotential bonding must be provided between the components in the cooling system.
● The customer must take measures to protect the devices against condensation.
● An anti-corrosion agent and, if necessary, a biocide should be mixed into the coolant.
● If there is a risk of frost, preventive measures must be taken during operation, storage,
and transportation (e.g. emptying and blowing out with air, additional heating).
● The requirements of the coolant in terms of its properties (temperature, chemical
characteristics, etc.) must be observed.
Recommendations
● To ensure mechanical decoupling, the devices should be connected by means of hoses.
● To prevent blockages and corrosion, you are advised to install a flushback filter in the
circuit (so that residues can be rinsed out when the system is running).
● The power units should be connected to the cooling circuit by means of shut-off fittings so
that they can be disconnected from the cooling circuit for servicing or repair without
having to empty the entire cooling system. A cooling water hose (EPDM) can be used to
connect the shut-off fitting to the power unit.
NOTICE
It is possible that the heatsink will burst if the coolant connections are kept closed
As long as there is still coolant in the device, the heatsink can burst if the coolant
connections are kept closed. This is because an inadmissibly high pressure can be
generated when the coolant expands as the temperature increases.
• Do not close the coolant connections if cooling liquid is still present in the device.
772
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
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