Siemens SINUMERIK 840D sl Function Manual

Functions
2.1 Acceleration without jerk limitation (BRISK/BRISKA) (channel-/axis-specific)
Basic logic functions: Acceleration (B2)
10 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Acceleration profile
WWW
D
PD[
D
D
PD[
Y
PD[
W
W
Y
Figure 2-1 Velocity and acceleration schematic for stepped acceleration profile
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:
• Time: t
0
Sudden acceleration from 0 to +a
max
• Interval: t
0
- t
1
Constant acceleration with +a
max
; linear increase in velocity
• Time: t
1
Sudden acceleration from 2 * a
max
with immediate switchover from acceleration to braking
Note
The sudden acceleration can normally be avoided by specifying a constant velocity time
(see Section: "Sudden acceleration with constant velocity phase").
• Interval: t
1
- t
2
Constant acceleration with -a
max
; linear decrease in velocity

Siemens SINUMERIK 840D sl Specifications

General

Control Type	CNC
Number of Axes	Up to 31
Max Number of Channels	10
Interfaces	Ethernet, PROFIBUS, PROFINET, USB
Interpolation	5-axis interpolation
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Display	TFT color display, various sizes
Programming Languages	DIN/ISO
Safety Features	Safety Integrated
PLC	Integrated PLC S7-300
Drive Interface	SINAMICS S120
Data Storage	CF card, USB
Operating System	Windows-based