Siemens 6SL3210-1SB11-0UA0 [280/318] Preventing cavitation

Siemens 6SL3210-1SE21-8UA0 [280/318] Preventing cavitation
Cooling circuit and coolant properties
10.1 Cooling circuit requirements
Manual
280 Manual, 01/2011, 6SL3097-4AC10-0BP2
Note
When non-conductive hoses are used, particular attention must be paid to the equipotential
bonding of all components. (Refer to the chapter titled "Equipotential bonding".)
Note
Once installed, the cooling system must be checked to ensure that it is properly sealed.
10.1.5 Preventing cavitation
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 on 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 provided in "Information about configuring cooling circuits" below
regarding series connections and maximum pressure must also be followed.
10.1.6 Commissioning
When commissioning the cooling water circuit, the following sequence must be observed:
Ventilate the heat sink the first time the devices are filled.
Remove the fixing glands located in front of the vent valve.
Perform ventilation.
Close the vent valve.
Screw the fixing glands tight again.
Check the seals.
Set the operating pressure according to the flow conditions of the cooling water system in
the supply and return lines.
Set the required cooling water flow rate per time unit.
CAUTION
Ventilation must only be performed when the system is at zero voltage.

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