Siemens Sinumerik 840D Series Function Manual page 255

02.99
10.03
Quality of seals
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Piston
2 x guide ring
(PTFE)
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Seal
(FPM+PTFE)
Fig. A-20 Cylinder
Dead volume
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
The quality of the seals and guides on the piston, and the piston rod itself, must
be particularly high in order to minimize the friction.
Transitions from static to sliding friction have a particularly adverse affect on the
quality of control accuracy. A friction compensation setting has been provided in
the HLA module (MD 5460: FRICTION_COMP_RADIENT).
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The dead volume is the volume between the cylinder and servo solenoid valve
that is not displaced by one piston stroke. It reduces the natural frequency of
the drive and should be avoided wherever possible.
Cylinder pipework should be kept as short as possible, i.e. the servo solenoid
valve should be mounted directly on the cylinder.
The dead volume is set in the HLA module (MD 5135, MD 5136 and
MD 5141...5143).
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Piston rod
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2 x guide ring Stabilizing ring
(PTFE) (FPM)
2 x sealing ring
(FPM+PTFE)
A Hydraulics
A.2 Cylinder
J
A-255