Parameterization - Siemens SINUMERIK 840D sl Function Manual

B2: Acceleration
5.2 Functions
The following features of the acceleration profile can be identified from the figure above:
● Time: t
Sudden acceleration from 0 to +a
● Interval: t
Constant acceleration with +a
● Time: t
Sudden acceleration from 2 * a
Note
The sudden acceleration can normally be avoided by specifying a constant velocity time
(see Section "Constant travel time (channel-specific) (Page 248)").
● Interval: t
Constant acceleration with -a
5.2.1.2

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 Section "Dynamic response mode for path
interpolation (Page 222)".
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 Section "Acceleration matching (ACC) (axis-specific) (Page 250)" and "Path
acceleration for real-time events (channel-specific) (Page 253)").
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:
246
0
- t
0 1
max
1
- t
1 2
max
max
; linear increase in velocity
with immediate switchover from acceleration to braking
max
; linear decrease in velocity
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions