Switchable Position Setpoint Filter Circuits - Siemens SINUMERIK 840D Function Manual

G2: Velocities, setpoint / actual value systems, closed-loop control
2.5 Closed-loop control
● With speed feedforward control:
● For combined torque/speed feedforward control
Note
If dynamic response adaptation is realized for a geometry axis, then all other geometry axes
must be set to the same dynamic response.
Further information
Commissioning Manual CNC: NC, PLC, drives
2.5.2

Switchable position setpoint filter circuits

Benefits
Two switchable position setpoint filter circuits allow the damping effect of the filters to be
adapted to the specific machining type, and these can also be selected during machining. For
example, filters that provide very high damping (Blackman filters) and very high axial jerk
factors ($MA_MAX_AX_JERK, $MA_PATH_TRANS_JERK_LIM) can be used, e.g. for motion
outside the workpiece or when roughing so that processing times can be significantly reduced.
The relatively high contour deviation in conjunction with the powerful filters have an excessively
high negative impact for these machining types.
It is advantageous to couple the filter switchover to the dynamic G code groups DYNNORM,
DYNROUGH, DYNFINISH and DYNPREC and initiate it via a cycle (e.g. CUST_832). The
status and values of the filter changeover can be queried using the following system variables.
● $VA_DESVAL_FILTERS_ACTIVE; status of the setpoint filter circuits
● $VA_DESVAL_FILTERS_DELAY_1/2; effective delay time of the 1st/2nd setpoint filter
circuit
● $VA_DESVAL_FILTERS_DELTA_POS; position difference between the setpoint filter
circuits.
Option
You require the following options in order to use this function:
72
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA