Siemens SINUMERIK 840D Description Of Functions page 43

02.99
Feasible
dynamics
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
Table 2-13 Extract from "HYDRO2" program
1. Alternative cylinder data (input)
Piston diameter
Rod diameter
Stroke
Mass on piston rod
Servo solenoid valve, size
Limit frequency of servo solenoid valve
Pipe length (cylinder/valve)
Internal pipe diameter
3. Calculated alternative results (outputs)
Natural frequency of cylinder
Natural frequency of hydraulic drive (incl. servo
solenoid valve)
Stroke at which min. natural frequency occurs
D
The natural frequency of the hydraulic drive is automatically calculated by the
HLA module and applied in the controller once the corresponding data have
been parameterized. See also the following machine data in Sections 4.8 and
4.9:
S
MD 5131: CYLINDER_PISTON_DIAMETER
...
MD 5136: CYLINDER_DEAD_VOLUME_B
S
MD 5140: VALVE_CYLINDER_CONNECTION
...
MD 5143: PIPE_INNER_ DIAMETER_A_B
S
MD 5150: DRIVE-MASS
...
MD 5152: CYLINDER_FASTENING
S
MD 5160: PISTON_POS_MIN_NAT_FREQ
...
MD 5163: DRIVE_NATURAL_FREQUENCY
The feasible dynamics of the servo solenoid valves (e.g. Bosch servo solenoid
valves used) is dependent on the valve modulation and is stated in the Bosch
catalog in Hz for the –90° corner frequency f
In the case of pilot-actuated valves, the valve dynamic response is not only de-
termined by the valve type, but also by the pilot pressure p
f ~ p
0
The Bosch catalog data are referred to a pilot pressure of 100 bar.
Servo-valves can reach corner frequencies of up to 1000 Hz, but are very sen-
sitive to contamination.
2.3 Configuring the hydraulic drive
D (mm)
d (mm)
h (mm)
m (kg)
f (Hz)
v
(mm)
(mm)
f (Hz)
0
f (Hz)
t
h (mm)
x
h
d
hx
m
(oscillating mass)
.
o
pilot
2 Configuring
Alt 1 Alt 2 Alt 3
50 63 80
22 28 36
500 500 500
150 200 400
Size Size Size
6 10 10
85 45 45
200 200 200
8 12 14
56,6 54,6 55,0
34 24,7 24,8
265 266 266
f
0
:
pilot
2-43