Siemens Sinumerik 840D Series Function Manual

10.03
2.3 Configuring the hydraulic drive
2-34
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
40%
10%
Q/Q
nom
U/U
nom
Rapid traverse
Machining velocity
Q/Q
nom
U/U
nom
Valve characteristic
Linearized
characteristic
compensation
10%
40%
Fig. 2-8 Diagram of a knee-shaped servo solenoid valve characteristic and its correction in the HLA module
Note
Recommended selection:
Servo solenoid valves are generally recommended for applications where there
is a clear separation between machining operation and rapid traverse.
It is a good idea to use valves with asymmetrical restriction cross-sections for
differential cylinders or for cylinders that are not arranged horizontally and move
large loads. This improves the hydraulic clamping of the cylinder and adjusts
the controlled system gain of the hydraulic servo-drive for both directions of
travel.
Q
U
P
A
P
B
Q
A
Q
B
v
OB
PT
G
Fig. 2-9 Asymmetrical characteristics
Asymmetrical
flowrate
characteristics
2 Configuration

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