Siemens SINUMERIK 840D sl Function Manual page 420

Compensations (K3)
5.7 Neural quadrant error compensation
Sequence of operations for "Relearning"
The sequence of operations involved in the Relearning process is described below.
1. If characteristic values have not yet been stored in the user memory (RAM) (e.g.
commissioning of a series machine), the pre-optimized data block must be loaded (see
Section "Fundamentals").
2. Adapt the NC program that moves the machine axes to the required positions and
parameterizes and calls the learning cycle. The parameters for the learning cycle (e.g.
QECLRN.SPF) might have to be changed for "relearning".
3. Activate the learning phase by starting this NC program. The compensation characteristic
is learned simultaneously for all parameterized axes.
4. Parameterize the trace for the circularity test in the menu "Circularity test measurement"
(with HMI Advanced or commissioning tool). After this, enable the measuring function
with the vertical softkey "Start".
5. Start the NC program with test motion for circularity test. The actual position values
during the circular movement are recorded and stored in the passive file system. After
termination of data recording, the recorded contour is displayed on the operator interface.
6. Check the quadrant transitions for the contour recorded.
7. Depending on the result, repeat items 3, 4, 5 and 6 if necessary. It might be necessary to
change certain QEC system variables first (see also Section "Further optimization and
intervention options").
8. The compensation characteristics must be saved as soon as the contour precision meets
requirements (see Section "Fundamentals").
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– Set "Learn mode" = 1
– Reduce the "number of learning passes" if necessary (e.g. to 5)
– Activate "section-by-section learning" if necessary and define the associated range
boundaries
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions