Siemens SINAMICS S120 - Machine Guidance; Cylinder

System overview
2.1 Structure of a hydraulic drive
Hydraulic Drive
26 System Manual, 04/2015, 6SL3097-4BA00-0BP1
2.1.1
Machine guidance
Guidance systems
Guidance for straight-line movement of machine slides and tables is accomplished with
minimum friction and maximum precision using hydrodynamic and hydrostatic slideways or
roller slideways.
Friction
A certain degree of friction can be very useful for damping oscillations.
However, excessive friction, especially pronounced transitions from static to sliding friction,
has a negative effect on the control result and impairs control loop stability.
2.1.2
Cylinder
Design
The cylinder represents the simplest form of a hydraulic linear actuator and can easily be
integrated into the machine guidance system. The cylinder normally has a piston rod at one
end.
Quality criteria
The following are critical quality criteria
● The surface quality of cylinder itself and piston rod
● The seals and guides (low friction, servo quality, ...)