Siemens SINUMERIK 828D Function Manual page 184

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Table of Contents

B1: Continuouspath Mode, Exact Stop, LookAhead

3.4 Dynamic adaptations

In addition, the "adaptation of the dynamic path response" function is not active during path movements:

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)

Dynamic adaptation not active (default setting)

Dynamic adaptation active

When activation takes place, the "smoothing the path velocity" function is always activated internally in

continuous-path mode as well (see "Smoothing the path velocity [Page 180]").

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.

Parameter assignment

Adaptation factor of the dynamic path response

Via the adaptation factor of the dynamic path response, temporary changes in the path velocity are executed with

smaller dynamic response limit values.

The adaptation factor is to be set on a channel-specific basis:

For traversing motions with acceleration without jerk limiting (BRISK) via:

MD20465 $MC_ADAPT_PATH_DYNAMIC[ 0 ]

→ The adaptation factor acts on the acceleration.

For traversing motions with acceleration with jerk limiting (SOFT) via:

MD20465 $MC_ADAPT_PATH_DYNAMIC[ 1 ]

→ The adaptation factor acts on the jerk.

Axis-specific limit frequencies

The dynamic response limiting should only be active during deceleration and acceleration processes that trigger

mechanical vibrations larger than a specific limiting frequency, thus causing excitation of machine resonances.

This limit frequency from which the dynamic response limiting activates, is specified on an axis-specific basis via

the machine data:

MD32440 $MA_LOOKAH_FREQUENCY (smoothing frequency for LookAhead)

(See also "Smoothing the path velocity [Page 180]".)

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

Sinumerik 840d sl