Siemens Sinumerik 840D Series Function Manual page 31

10.03
Mounting
Mounting position
Seal, friction
Cylinder pipes
Position
measuring system
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
In order to ensure good control quality, backlash-free mountings, e.g. base or
flange mountings, must be used.
Flange mounting
Flange at front
Ì
Ì Ì
Ì
Ì
Base mounting
Ì Ì Ì Ì Ì Ì Ì Ì
Ì Ì Ì Ì Ì Ì Ì Ì
Fig. 2-7 Cylinder mounting methods
This is will depend on the machine's situation and affects the choice of shutoff
valves (see Subsection 2.3.3). Vertical loads must be protected via poppet
valves. Forces due to weight must be taken into account in the final calculation
of the operating pressure (MD 5151: CYLINDER_A_ORIENTATION).
See Fig. 4-17 in Section 4.9 for the possible cylinder mounting positions.
Suitable seals must be used to minimize friction. Transitions from static to slid-
ing friction have a particularly adverse affect on the control result.
The slide guide friction must be added to the cylinder friction. A friction com-
pensation setting has been provided in the HLA module (MD 5460:
FRICTION_COMP_GRADIENT) for the purpose of counteracting initial friction.
The distance between the cylinder and servo solenoid valve must be kept as
short as possible for the sake of the drive's natural frequency (compressibility of
the oil volume). In ideal cases, the servo solenoid valve is flange-mounted
directly on the cylinder.
The incremental and absolute position measuring systems supported by the
HLA module are mounted on the machine slide. It is also possible to use posi-
tion measuring systems (SSI encoders) integrated in the cylinder.
2.3 Configuring the hydraulic drive
Flange at rear
Ì Ì
Ì Ì Ì Ì
Ì Ì
Ì Ì
2 Configuration
2-31