Siemens 6SL3210-1SE27-5UA0 [273/318] Cooling circuit requirements

Manual
Manual, 01/2011, 6SL3097-4AC10-0BP2
273
Cooling circuit and coolant properties
10
10.1 Cooling circuit requirements
10.1.1 Technical cooling circuits
Technical cooling circuits can be divided into three systems:
1. Closed cooling circuits (recommended)
In closed systems, the circuit coolant is separated from the surrounding atmosphere,
which prevents the ingress of oxygen. The coolant is only routed through the SINAMICS
devices, the components required for cooling and, if necessary, a motor. The heat is
dissipated to the atmosphere indirectly by means of heat exchangers. The system should
ideally function without losing any coolant and, once filled, should not need any water to
be added. The composition of the coolant can be adjusted as required (e.g. by using
desalinated water and adding anti-corrosion agents). It either does not change at all
during operation, or changes only in a defined manner.
The closed cooling circuit is recommended as a standard solution.
2. Open cooling circuit
The coolant is routed not only through the SINAMICS devices and components required
for cooling, but also through external devices.
The heat transferred to the circuit coolant evaporates via a cooling tower. This
evaporation causes the coolant to become more concentrated (densification) because
water molecules escape, while dissolved substances remain in the coolant. During
operation, therefore, the composition of the coolant changes significantly, which means
that it must be monitored and topped up continuously.
3. Semi-open cooling circuit
Oxygen can only enter the coolant via the pressure compensator. Otherwise, see 1.
Semi-open cooling circuits are permitted.
10.1.2 Cooling system requirements
Open cooling systems must never be used for liquid-cooled Power Modules. A closed
cooling circuit with a membrane expansion tank (MET), safety valve (SV), and heat
exchanger (HE) is recommended, which connects the cooling circuit to an external cooler
(refer also to the chapter titled "Using heat exchangers").

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