Siemens SINAMICS S120 Equipment Manual page 229
Chassis liquid cooled power units
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Also See for SINAMICS S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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The maximum system pressure is 600 kPa. The lowest possible pressure should be selected
to allow use of pumps with a flat characteristic.
Maximum permissible differential pressure for a heat sink: 200 kPa.
The layout must be selected such that the total length of supply and drain pipe is equal for
each SINAMICS unit or motor.
It is not permissible to create water cooling systems with series-connected modules and/or
modules and motors as the increased volumetric flow increases the risk of cavitation and
abrasion. This type of arrangement is acceptable only if the pressure difference per unit does
not exceed 200 kPa.
Installation
The connection between the units and cooling system should be designed with hoses for
mechanical decoupling.
The following hose types are recommended:
● EPDM hoses with an electrical conductivity >10
● DEMITTEL made of PE / EPDM supplied by Telle
● Secured with clips conforming to DIN 2871, available, e.g. from Telle, see Table in
The following information must be observed when installing the cooling circuit:
● Seals must be free of chloride, graphite and rust.
● As a result of negative experience with Teflon, Viton, AFM34 and EPDM are
● In order to prevent cavitation damage to the pump (but also in the heat sink), the
● To prevent blockages and corrosion, it is advisable also to install a flushback filter in the
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1
Semperit, or
Section "Materials".
recommended instead.
pressure on the suction side of the pump must be a minimum of 30 kPa, or the geodesic
height from the reservoir to the pump suction side must be >3 m (see Section "Preventing
cavitation").
circuit (so that residues can be rinsed out when the system is running).
Cooling circuit and coolant properties
ohms, e.g. Semperflex FKD supplied by
9
8.1 Cooling circuits
227
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