Siemens Sinumerik 840D Series Function Manual

C-259
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Definition of Terms
Cylinder piston diameter
Cylinder piston rod diameter
Natural frequency (resonant frequency) of hydraulic drive
Limit frequency that can be achieved by velocity-controlled drive
Natural frequency of servo solenoid valve
Limit frequency of servo solenoid valve
Cylinder stroke
Mass on piston rod
Cylinder piston area
Pressure at A end of cylinder
Pressure at B end of cylinder
Pump pressure
Pressure difference (nominal pressure drop)
Nominal flowrate of servo solenoid valve
Flow rate of servo solenoid valve
D1, D2
d1, d2
f
0drive
f
0control
f
0valve
f
v
h
m
O
p
A
p
B
p
p
Dp
Q
nom
Q
valve
C

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