Cooling Circuits - Siemens Sinamics S120 Manual
Liquid-cooled chassis power units
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Also See for Sinamics S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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Cooling circuit, coolant properties and protection against condensation
9.1 Cooling circuits
9.1
Cooling circuits
General information
The type of heat sink materials used requires two distinctly different heat exchange
concepts.
Different materials are used to guide the coolant into the cooling plates of the SINAMICS
S120 liquid-cooled devices, providing the user with a range of different options for the design
of the cooling circuit.
The electrochemical processes that take place in a cooling system must be minimized by
choosing the right materials. For this reason, mixed installations (i.e. a combination of
different materials, such as copper, brass, iron, or halogenated plastic (PVC hoses and
seals)) should not be used or limited to the absolutely essential minimum. The materials
must be selected so that no electrical corrosion occurs (electro-chemical series of metals),
see Chapter Materials (Page 338).
Please read the following definitions for clarification:
1. Closed cooling circuit
The pressure compensator is closed (no ingress of oxygen) and is fitted with a pressure-
relief valve (< 6 bar); it is always connected on the suction side of the pump. A separate
pressure-relief valve (<6 bar) must be connected to the discharge side of the pump. The
coolant is guided only through the SINAMICS devices, the heat exchange components
and possibly to a motor (for example, see Figure below). The materials used in the
cooling circuit comply with the specifications provided in Chapter Materials (Page 338).
2. Open cooling circuit
The coolant is guided through the SINAMICS devices and the heat exchange
components, as well as through components external to the cooling circuit. The materials
used comply with the minimum requirements stipulated in Chapter Materials (Page 338).
3. Semi-open cooling circuit
Oxygen can be transferred to the coolant only via the pressure compensator, otherwise
as for 1.
310
Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7
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