Siemens SINUMERIK 840D sl Function Manual page 415

Extended functions

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Learning motion

The axis traversing motions that must be executed to learn a specific response are

generated by an NC program. Each learning motion of the sample learning cycle comprises

a group of NC blocks with parabolic movements (ensuring that the axis traverses at the most

constant possible setpoint speed after the zero crossing; see diagram below) in which the

axes oscillate at constant acceleration in each program section. The acceleration is

decreased from group to group. In the diagram below, NC blocks 2 to 3, 5 to 6 and 8 to 9

each form a group; the transitional movements to lower acceleration rates are programmed

in blocks 1, 4, 7 and 10.

So that the learning parameters act as preset, the feedrate override switch must be set to

100% during the learning phase.

Assignment of system variables

Before a learning cycle is called, all QEC system variables must be set to the values

required for the learning process. The values recommended in the reference NC program

must be checked and changed if necessary (see Section "Parameterization of neural QEC").

Extended Functions

Function Manual, 01/2008, 6FC5397-1BP10-3BA0

The circularity test is an integral component of HMI Advanced. The commissioning tool

must be used with HMI Embedded.

Typical traverse motion of an axis when learning the QEC characteristic

Compensations (K3)

5.7 Neural quadrant error compensation

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Sinumerik 840de sl