Siemens SINUMERIK 840D sl Function Manual page 214

B1: Continuous-path mode, Exact stop, Look Ahead
4.4 Dynamic adaptations
The dynamic response of the acceleration and deceleration processes can be adapted to the
machine conditions using the "adaptation of the dynamic path response" function.
Note
The "adaptation of the dynamic path response" function only concerns the resulting path and
not the deceleration and acceleration processes of the individual axes involved in the path.
For this reason, critical deceleration and acceleration processes of the axes with respect to
the excitation of mechanical vibrations can occur due to discontinuous contour profiles or
kinematic transformations, even with a constant path velocity profile.
Effectiveness
The "adaptation of the dynamic path response" function is only effective during path motions:
● Continuous-path mode (G64, G64x)
In continuous-path mode, the optimal effect of the dynamic response adaptation is attained
with an active 100% override. Considerable deviations from this value or functions that
cause the path axes to decelerate (e.g. auxiliary function outputs to the PLC) greatly reduce
the desired action.
● Exact stop (G60)
In addition, the "adaptation of the dynamic path response" function is not active during path
motions:
● Programmed rapid traverse (G0)
● Changes in the override value
● Stop requests during motion (e.g. NC Stop, NC Reset)
● "Velocity-dependent path acceleration" function (DRIVE) is active
Activation/deactivation
The function is activated/deactivated with the machine data:
MD20465 $MC_ADAPT_PATH_DYNAMIC (adaptation of the dynamic path response)
Value
= 1.0
> 1.0
When activation takes place, the "smoothing the path velocity" function is always activated
internally in continuous-path mode as well (see Section "Smoothing of the path velocity
(Page 210)").
If the smoothing factor (MD20460 $MC_LOOKAH_SMOOTH_FACTOR) is set to 0%
(= function deactivated; default!), a smoothing factor of 100% is used as a substitute. For a
smoothing factor other than 0%, the set value takes effect.
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Meaning
Dynamic adaptation not active (default setting)
Dynamic adaptation active
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions