Jerk Filter (Axis-Specific); General Information - Siemens SINUMERIK 828D Function Manual

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The velocity-dependent jerk adaptation becomes active for the 1st and 2nd axis, while the function for the 3rd

axis is not active.

The maximum permitted jerk of the 1st axis is, for axis velocities greater than 6000 mm/min, increased by a factor

of 2 - for the 2nd axis, by factor of 3.

The maximum jerk is linearly increased for axis velocities in the range 3000 mm/min to 6000 mm/min.

Jerk filter (axis-specific)

In certain application scenarios, e.g.,when milling free-form surfaces, it may be beneficial to smooth the position

setpoint characteristics of the machine axes. This enables surface quality to be improved by reducing the

mechanical vibrations generated in the machine.

For the purpose of smoothing the position setpoint characteristic of a machine axis, a jerk filter can be activated

at position controller level, independently of the channel- and axis-specific jerk limitations taken into account at

interpolator level.

The effect of the jerk filter must be as strong as possible without having an unacceptable impact on contour

accuracy. The filter should also have as "balanced" a smoothing effect as possible, i.e., if the same contour is

traversed forwards and backwards, the contour smoothed by the filter should be as similar as possible in both

To enable the jerk filter to be optimally matched to the machine conditions, various filter modes are available:

2nd-order filter (PT2)

Sliding mean value generation

Bandstop filter

Mode: 2nd-order filter

Owing to the fact that it is a simple low-pass filter, "2nd-order filter" mode can only meet the requirements

specified above where relatively small filter time constants (around 10 ms) are concerned. When used in

conjunction with larger time constants, impermissible contour deviations are soon manifest. The effect of the filter

is relatively limited.

This filter mode offers advantages if very large filter time constants are needed and contour accuracy is only of

secondary importance (e.g. positioning axes).

For historical reasons, this filter mode is set as the default.

Basic Functions

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

B2: Acceleration

4.2 Functions

Sinumerik 840d sl