Siemens Drives – SINAMICS S120

By CNC Design Pty Ltd

The modular drive system for high-performance applications -

SINAMICS S120 has numerous components and functions that are harmonized and coordinated with one another. It offers high-performance single-motor drives and coordinated drives (multi-axis applications) with vector functionality for the highest torque accuracy – or servo functionality for the highest dynamic performance and covers the power range from 0.25 to 4,500 kW with supply voltages 1-ph. 230V, 3-ph. 380–480V and 3-ph. 660–690V.

SINAMICS S120 allows power and control performance to be freely combined. Multi-axis drive solutions with higher level motion control can be implemented using the modular SINAMICS S120 drive system just the same as solutions involving single-motor drives. This means that the machines can be designed to be fully modular. SINAMICS S120 guarantees the perfect compatibility between all of the system components without requiring any major engineering costs.


SINAMICS S120 means increased machine performance in many sectors – whether continuous material webs or cyclic and high-dynamic processes, for instance in:

·         Packaging machines

·         Plastics machines

·         Textile machines

·         Printing machines

·         Paper machines

·         Handling and assembly systems

·         Machine tools

·         Energy Generators


The innovative SINAMICS S120 hardware and software concept tackles sophisticated drive tasks in industrial applications with a power range extending from 0.12 through to 4,500 kW and supported line supply voltages 230 V, 380–480 V and 660–690 V (50/60 Hz). SINAMICS S120 can be used with induction and synchronous motors including torque and linear motors. SINAMICS S120 offers high-performance individual AC/AC drives in the Blocksize and Chassis formats as well as coordinated DC/AC drives for multi-axis applications in the Booksize and Chassis formats and Cabinet Modules.


For SINAMICS S120, the drive intelligence is combined together with the control functions in Control Units (CU), which handle both vector and servo control as well as V/f control. For all drive axes, they also handle the speed and torque control as well as additional intelligent drive functions.


SINAMICS S120 vector control is recommended for drive solutions involving continuous material webs – for instance, wire drawing, foil making and paper. Servo control with SINAMICS S120 is used for cyclic processes with precise and fast closed-loop position control using servomotors. For instance, this includes applications in the packaging and printing industries as well as machine tools.


SINAMICS S120 drive systems have extensive safety functions. They allow innovative safety concepts to be simply realized in conformance with the appropriate standards. “Safe Torque Off”, “Safe Stop 1” and “Safe Brake Control” are included onboard as basic safety functions. When selected, e.g. in a dangerous situation, all three functions disconnect the energy feed to the motor in a safety-relevant fashion.


The extended safety functions ”Safe Operating Stop“, ”Safe Stop 2“, ”Safety-Limited Speed“ and ”Safe Speed Monitor“ permit the drive to be reliably monitored in operation or when exceptional situations temporarily occur – such as when equipping machines or when service work is being carried out. Service and maintenance work can be performed safely in a user friendly fashion – which significantly reduces machine and plant downtimes.


Every single-axis SINAMICS S120 AC Drive is a combination of a Power Module and a selectable Control Unit or Control Unit Adapter. An optional filter can also be integrated. If the AC Drive is operated as a stand-alone single-axis drive, a Control Unit (e.g. CU310 DP) is added to the Power Module. It contains the entire control intelligence for the drive, including positioning functions and the field bus interface. For modular machine concepts being increasingly implemented in the packaging and woodworking industries, the AC Drive is combined with other SINAMICS S120 units to build an integrated multi-axis drive solution. A CUA31 Control Unit Adapter is added to the Power Module in order to connect the AC Drive to a central Control Unit (e.g. CU320 or SIMOTION D) via the DRIVE-CLiQ.


SINAMICS S120 AC Drives can easily be implemented in conjunction with the Motion Controller using PROFIBUS DP or PROFINET and the standardized PROFIdrive profile. Solutions to standard positioning tasks in automated assembly machines and handling systems as well as synchronous movements and motion control tasks – especially in the SIMATIC PLC environment – can therefore be found using SINAMICS S120 AC Drives even without in-depth knowledge of drives.


SINAMICS S120 Booksize, Chassis formats and Cabinet Modules as DC/AC drive units distinguish themselves due to their modular design. All of the drive intelligence is provided in the Control Units (CU), which handle all of the control functions in the drive group. Further, they execute all additional drive functions – e.g. logically interlocking drive-related I/Os, positioning functions, etc. – and have either PROFIBUS DP or PROFINET as central interface to couple to Motion Controller. SIMOTION D or SINUMERIK 840D sl can be used as special Control Units for motion control and NC applications.


Line Modules centrally feed the energy into the DC link. Line Modules with regulated infeed/regenerative feedback can optionally ensure a constant DC link voltage and avoid undesirable harmonics fedback into the line supply, regenerative feedback when braking/ generating and for an increased degree of ruggedness with respect to line supply fluctuations


Motor Modules supply motors with power from the DC link. Double-axis modules allow an especially compact design to be achieved. Drive-related inputs/ outputs can be expanded in a scalable fashion using Terminal Modules.


SINAMICS S120 Chassis drive units are available both in air-cooled as well as liquid-cooled versions. The liquid-cooled version is ideal for dusty, salt-laden or aggressive ambient air and represents a cost-saving alternative with low operating costs. It allows hermetically sealed cabinet solutions to be implemented with a footprint that is up to 60 % smaller. The Booksize units are either available with

internal/external air cooling or with liquid cooling. Drive units with coldplate cooling allow heat to be dissipated through the rear of the units to the mounting surface.


A modular and extremely compact cabinet system is available in the form of the SINAMICS S120 Cabinet Modules. These finely scalable power and module types can be used to engineer almost any drive solution for multi-motor drive systems. Thanks to the standard interfaces, the modules can be interlinked and combined to quickly configure ready-to-connect drive solutions up to 4,500 kW.


With SINAMICS S120 the modular expansion of your machines is never limited. Cost-optimized and specific solutions are ensured since only the components and functions required for a perfect fit solution are used.