Acceleration Margin (Channel-Specific); General Information; Parameterization; Path-Acceleration Limitation (Channel-Specific) - Siemens SINUMERIK 828D Function Manual

B2: Acceleration
4.2 Functions
4.2.5

Acceleration margin (channel-specific)

4.2.5.1

General Information

General information
Under normal circumstances, preprocessing makes maximum use of the parameterized maximum values of the
machine axes for the purpose of path acceleration. In order that an acceleration margin may be set aside for
overlaid movements, e.g., within the context of the "Rapid lift away from the contour" function, path acceleration
can be reduced by a programmable factor. When, for example, a factor of 0.2 is applied, preprocessing will only
use 80% of the maximum possible path acceleration. 20% is set aside as an acceleration margin for overlaid
movements.
4.2.5.2

Parameterization

Parameters for the acceleration margin are assigned for each channel by means of machine datum:
MD20610 $MC_ADD_MOVE_ACCEL_RESERVE
(acceleration margin for overlaid motions)
4.2.6

Path-acceleration limitation (channel-specific)

4.2.6.1 General Information
General Information
To enable a flexible response to the machining situations concerned, setting data can be used to limit the path
acceleration calculated during preprocessing for specific channels:
SD42500 $SC_SD_MAX_PATH_ACCEL (maximum path acceleration)
The value specified in the setting data is only taken into account if it is smaller than the path acceleration
calculated during preprocessing.
The limitation must be activated for specific channels using setting data:
SD42502 $SC_IS_SD_MAX_PATH_ACCEL = TRUE
4.2.6.2 Parameterization
Parameterization is carried out for specific channels using setting data:
SD42500 $SC_SD_MAX_PATH_ACCEL (maximum path acceleration)
SD42502 $SC_IS_SD_MAX_PATH_ACCEL (activation of path-acceleration limitation)
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions