Siemens SINAMICS S120 Equipment Manual page 24

System overview
1.2 SINAMICS S120 drive system
SINAMICS S120 components
The SINAMICS S120 components are primarily used for multi-axis drive tasks.
The following power components are available:
● Line-side power components, such as fuses, contactors, line reactors and line filters for
● Power Modules, which function as both a power infeed and an inverter.
● Line Modules, which supply power centrally to the DC link.
● DC link components (optional), which stabilize the DC link voltage
● Motor Modules, which act as inverters, receive power from the DC link, and supply the
connected motors.
● Motor-side components such as sine-wave filters, motor reactors, and dv/dt filters for
reducing the voltage loads on the motor windings.
To carry out the required functions, SINAMICS S120 is equipped with:
● A Control Unit that carries out all drive and technological functions across all axes.
● Additional system components that enhance functionality and offer different interfaces for
encoders and process signals.
SINAMICS S120 components were developed for installation in cabinets. They have the
following features and characteristics:
● Easy to handle, simple installation and wiring
● Practical connection system, cable routing in accordance with EMC requirements
● Standardized design, seamless integration.
Boundary conditions for use
The Power Modules, Line Modules and Motor Modules are designed for connection to a
liquid coolant circuit which must be provided by the customer.
The design of this liquid coolant circuit is an important factor in determining the operational
reliability and service life of the equipment and the entire installation.
The main criteria are described in the following chapters.
Advantages of liquid cooling over air cooling
Liquid cooling systems are considerably more efficient at dissipating heat losses than air
cooling systems. As a result, liquid-cooled devices are much more compact than air-cooled
units with the same output rating. Since the heat losses generated by the electronic
components are almost completely dissipated by the liquid coolant, only very small cooling
fans are required. This makes the devices extremely quiet in operation. Due to their compact
dimensions and almost negligible cooling air requirement, liquid-cooled units are the
preferred solution wherever installation space is restricted and/or the ambient operating
conditions are rough. Control cabinets with liquid cooling are easy to implement as
hermetically sealed units with degrees of protection of IP54 or above.
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switching the power supply and complying with EMC regulations.
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1