Siemens Sinumerik 840D Series Function Manual

10.03
1.3 Structure of an electro-hydraulically-controlled drive axis
1-18
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
1.3 Structure of an electro-hydraulically-controlled drive
axis
SINUMERIK 840D,
SIMODRIVE 611 digital
with HLA module
Servo solenoid value with
valve amplifier (OBE)
Machine guideway
Position
measuring
system
Hydraulic power unit
Shutoff valve
Fig. 1-1 Construction of an electro-hydraulically controlled drive axis
1.3.1 Machine guideway
Hydrodynamic and hydrostatic slideways or roller slideways allow machine
slides and tables to move in straight lines with minimum friction and maximum
precision.
A degree of friction can be very useful for damping oscillations.
However, excessive friction, especially pronounced transitions from static to
sliding friction, have a negative effect on the control result and impair the control
loop stability.
Guide mechanism
Friction
1 General
02.99

Siemens Sinumerik 840D Series Specifications

General

Axes	Up to 31 axes
Power Supply	24 V DC
Control Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
PLC	Integrated PLC (programmable logic controller)
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Max. Number of Channels	Up to 10 channels