Parameterization - Siemens SINUMERIK 840D Function Manual

B2: Acceleration and jerk
12.2 Functions
● Time: t
Sudden acceleration from 2 * a
Note
The sudden acceleration can normally be avoided by specifying a constant velocity time
(see Section "Constant traversing time (channel-specific) (Page 352)").
● Interval: t
Constant acceleration with -a
12.2.1.2

Parameterization

Maximum axial acceleration for path motions
The maximum axial acceleration for path motions can be set for the specific technology for each
machine axis via the following machine data:
MD32300 $MA_MAX_AX_ACCEL[<parameter set index>]
With <parameter set index> = 0, 1, 2 ... (max. parameter set number - 1)
For the technology-specific parameter sets, see the Function Manual "Basic Functions",
Section "Dynamic mode for path interpolation".
The path parameters are calculated by the path planning of the preprocessing so that the
parameterized maximum values of the machine axes involved in the path are not exceeded.
Note
It is possible for the maximum value to be exceeded in connection with specific machining
situations (see Sections "Acceleration adaptation (ACC) (axis-specific) (Page 354)" and "Path
acceleration for real-time events (channel-specific) (Page 357)").
Maximum axial acceleration for positioning axis motions
With positioning axis motions, one of the two following maximum values is effective depending
on the set positioning axis dynamic response mode:
● MD32300 $MA_MAX_AX_ACCEL [0] (maximum axial acceleration for path motions in the
dynamic response mode DYNNORM)
● MD32300 $MA_MAX_AX_ACCEL [1] (maximum axial acceleration for path motions in the
dynamic response mode DYNPOS)
The positioning axis dynamic response mode is set in the NC-specific machine data:
MD18960 $MN_POS_DYN_MODE = <mode>
<mode>
350
1
- t
1 2
Meaning
0 Effective maximum axial acceleration: MD32300 $MA_MAX_AX_ACCEL[ 0 ]
1 Effective maximum axial acceleration: MD32300 $MA_MAX_AX_ACCEL[ 1]
with immediate switchover from acceleration to braking
max
; linear decrease in velocity
max
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA