B2: Acceleration
4.2 Functions
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
219
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
• Interval: t
1
- t
2
Constant acceleration with -a
max
; linear decrease in velocity
4.2.2.2
Programmable maximum value (axis-specific)
Function
The maximum acceleration value can be set for each specific machine axis:
MD32300 $MA_MAX_AX_ACCEL (maximum axis acceleration)
The path parameters are calculated by the path planning component during preprocessing so that the
programmed maximum values of the machine axes that are of relevance for the path are not exceeded.
Exceeding of maximum value
It is possible for the maximum value to be exceeded in connection with specific machining situations (see
Section: Acceleration matching (ACC) and System variable ($AC_PATHACC)).
4.2.2.3
Parameterization
The maximum values are parameterized for specific axes using machine data:
MD32300 $MA_MAX_AX_ACCEL (Maximum axis acceleration)
Note
The sudden acceleration can normally be avoided by specifying a constant velocity time
(see Section: "Sudden acceleration with constant velocity phase").
