Siemens 6SL3210-1SE27-5UA0 [275/318] Cooling circuit configuration

Siemens 6SL3210-1SE23-2UA0 [275/318] Cooling circuit configuration
Cooling circuit and coolant properties
10.1 Cooling circuit requirements
Manual
Manual, 01/2011, 6SL3097-4AC10-0BP2
275
10.1.3 Cooling circuit configuration
The liquid-cooled Power Modules are designed to be connected in parallel to the cooling
circuit. The pressure drop in the joint supply and return lines is to be kept at negligible levels
by choosing a sufficiently large pipe diameter.
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Figure 10-1 Example of a closed cooling circuit
The supply line (P1) has a differential pressure p compared to the return line (P2); this
pressure must be in the range 70 kPa to 200 kPa. This ensures that every connected unit
has the required volume of cooling liquid flowing through it. Pressure P1 and P2 with respect
to the atmosphere must not exceed 600 kPa.
A pump's pressure depends on the volumetric flow, so the pressure created will depend on
the number of components which are connected. At the minimum differential pressure p1
(measured between the supply and return lines of the individual component), the volume of
coolant required to enable the component to achieve its unit rating or rated current is to flow
through each component. At the maximum differential pressure p2 (measured between the
supply and return lines of the individual component), the volumetric flow must not result in
damage to the component, for example by means of cavitation. If necessary, pressure
reducing valves such as baffle plates will have to be installed in the piping; these must be
easy to access, clean, and/or replace.
When the pump is switched off, static pressure occurs in the system. The static pressure can
be influenced by the primary pressure of the membrane expansion tank (MET) and should
be at least 30 kPa on the pump's suction side. If the static pressure is too low, the pump may
be damaged due to cavitation during operation. If necessary, note any differing minimum
pressure values from the pump manufacturer. When components are installed at different
heights, the geodesic pressure caused by the height difference must be taken into account
(1 m height difference corresponds to 10 kPa).

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