Siemens Sinumerik 840 sl Function Manual

Functions
2.11 Jerk limitation with path interpolation (SOFT) (channel-specific)
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
29
Acceleration profile
W
U
PD[
U
U
PD[
W
WW W WWW
D
PD[
D
D
PD[
Y
PD[
W
W
Y
Figure 2-4 Jerk, acceleration and velocity schematic with jerk limitation acceleration profile
r
max
: Maximum jerk value
a
max
: Maximum acceleration value
v
max
: Maximum velocity value
t: Time
The following features of the acceleration profile can be identified from the figure above:
• Interval: t
0
- t
1
Constant jerk with +r
max
; linear increase in acceleration; quadratic increase in velocity
• Interval: t
1
- t
2
Constant acceleration with +a
max
; linear increase in velocity
• Interval: t
2
- t
3
Constant jerk with -r
max
; linear decrease in acceleration; quadratic decrease in excessive
velocity until maximum value +v
max
is reached
• Interval: t
3
- t
4
Constant jerk with +r
max
; linear increase in braking acceleration; quadratic decrease in
velocity
• Interval: t
4
- t
5
Constant braking acceleration with -a
max
; linear decrease in velocity

Siemens Sinumerik 840 sl Specifications

General

Brand	Siemens
Model	Sinumerik 840 sl
Category	Control Unit
Language	English