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Cooling circuit and coolant properties

10.1 Cooling circuit requirements

Manual

276 Manual, 01/2011, 6SL3097-4AC10-0BP2

When the pump is switched on, a (location-dependent) flow pressure is present in the

cooling circuit, which must be determined from the pump characteristic curve and the

volume-flow-dependent pressure drop. Characteristics have been specified for the pressure

drop of the Power Modules. The pressure drop in the filter and, if applicable, an additional

pressure drop in the connection pipes must be added to this pressure drop (70 kPa for H

O).

Up to 50 kPa must be added for the pressure drop in a (contaminated) filter and in

connection pipes. The intersection of the pump characteristic curve and the pressure drop of

the whole cooling system yields the volumetric flow V

rated

of the coolant at this operating

point.

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Figure 10-2 Pump characteristic curve

Permissible system pressure

The maximum permissible system pressure is 600 kPa.

If a pump that is capable of exceeding this maximum permissible system pressure is used,

the customer must take steps (e.g. safety valve p ≤ 600 kPa, pressure control, or similar) to

ensure that the maximum pressure limit is not exceeded.