Siemens SINUMERIK 840D sl Function Manual page 438

Compensations (K3)
Neural quadrant error compensation
"Relearning"sequence
"Relearning" -> cycle parameters "Learning mode" = 1
"Relearning" can be used to perform a simple, automatic re-optimization process on
previously learned characteristics. The values already in the user memory are taken as the
basis.
The reference NC programs adapted to the machine (e.g. from "initial learning") must be
used in the learning phase for "relearning". Generally, the previous values of the QEC
system variables can still be used. Before the learning cycle is called, the parameter
"learning mode" must be set to 1 (meaning "relearning"). It might also be used to reduce the
"number of training passes".
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.
2. Adapt the NC program that moves the machine axes to the required positions and
3. Activate the learning phase by starting this NC program. The compensation characteristic
4. Parameterize the trace for the circularity test in the menu "Circularity test measurement"
5. Start the NC program with test motion for circularity test. The actual position values
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
8. The compensation characteristics must be saved as soon as the contour precision meets
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commissioning of a series machine), the pre-optimized data block must be loaded (see
Section "Fundamentals").
parameterizes and calls the learning cycle. The parameters for the learning cycle (e.g.
QECLRN.SPF) might have to be changed for "relearning".
– 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
is learned simultaneously for all parameterized axes.
(with HMI Advanced or commissioning tool). After this, enable the measuring function
with the vertical softkey "Start".
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.
change certain QEC system variables first (see also Section "Further optimization and
intervention options").
requirements (see Section "Fundamentals").
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions