Cooling circuit and coolant properties
13.1 Cooling circuit requirements
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
777
The following materials can be used for the cooling system piping:
● Pipes and corrugated piping made of stainless steel (V2A or V4A steel; NIROSTA
austenite)
● Hoses made of EPDM / EPDM with an electrical resistance <10
9
ohms (e.g. Semperflex
FKD; from the Semperit company, Wimpassing - Austria)
● DEMITEL® hoses made of PE / EPDM (the Telle company, Nuremberg)
● Clamps according to DIN 2871 for fixing, available for example from the Telle company
All control cabinets must be designed with a PE busbar and a good electrical connection
must be established between them.
Note
The sealing materials must be free of chlorides, graphite, and carbon (Viton
®
or EPDM).
-based seals are not permitted.
-conductive hoses are used, particular attention must be paid to the equipotential
bonding of all the components (see Chapter
Equipotential bonding in the cooling system
783)).
Check the cooling system for tightness after installation.
The following applies to all cooling circuits:
● The cooling circuit must always be designed in such a way that the pressure
compensator is located on the suction side of the pump (if possible, directly at the pump).
● The minimum pressure on the suction side of the pump must be approximately 30 kPa, or
the geodesic height from the reservoir to the pump suction side must be > 3 m.
● The pressure drop across a SINAMICS device must not exceed 200 kPa in continuous
operation, otherwise the high volumetric flow can increase the risk of cavitation and/or
abrasion damage.
● The guidelines given in Chapter Cooling circuit configuration (Page 773) regarding series
connections and maximum pressure must also be followed.
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