July 2013 6.8 The control loop 825
When setting the jerk and acceleration values, as well as selecting the
suitable filters, take into account
• the running noises of the machine
• the mechanical load (wear)
• the desired machining speed.
Settings of the
nominal position
value filters
Enter the permissible axis-specific jerk:
• For single filter: MP1230.x (at corners), MP1240.x (at curvature changes,
e.g. tangential transition from a line to an arc)
• For double filter: MP1231.x (at corners), MP1241.x (at curvature changes)
• For HSC filter: MP1232.x (at corners), MP1242.x (at curvature changes)
• For advanced HSC filter: MP1233.x (at corners), MP1243.x (at curvature
changes)
• For rapid traverse at corners in MP1250.x: Here a factor of the value from
the corresponding MP123x.x is entered. At transitions between rapid
traverse motions, the jerk set in MP123x.x multiplied by this factor is
active.
In MP1202.0, define a tolerance for contour transitions with motions at the
machining feed rate. This tolerance can be overwritten by the machine user
with Cycle 32 "Tolerance."
In MP1202.1, define a tolerance for contour transitions with motions at rapid
traverse. This tolerance can not be overwritten by the machine user with
Cycle 32 "Tolerance."
When selecting the limit frequencies for single filters (MP1210), double
filters (MP1211), HSC filters (MP1212) and advanced HSC filters (MP1213),
take into account the lowest resonant frequency of your machine’s axes and
the desired damping at this frequency. If the limit frequency is set to 0, the
filter is switched off.
With MP1200, select from the single, double, HSC and advanced HSC filters
the nominal position value filters for the Program Run, Single Block,
Program Run, Full Sequence and Positioning with Manual Data Input
operating modes.
With MP1201, select the nominal position value filters for the Manual,
Handwheel, Jog Increment and Pass Over Reference Point operating
modes. Single and double filters are available here.
With MP1222 and MP1223 you specify whether the tolerance from
MP1202 or Cycle 32 is also considered for curvature changes. MP1222
affects the HSC filter, and MP1223 affects the advanced HSC filter.
In order to achieve the optimum results for your machine or application, test
the various filter settings with a test part consisting of short, straight paths.
The tolerance (MP1202.x, Cycle32) always refers to the nominal value,
meaning the servo lag also affects the contour accuracy.
For example, if the servo lag S = 5 µm and the tolerance T = 10 µm, then
the total deviation is 15 µm.
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