Siemens SINUMERIK 840D sl Function Manual page 442

Compensations (K3)
Neural quadrant error compensation
Figure 5-33
Alteration of error measuring time
During the learning phase for the neural network, the error measuring time determines the
time window within which contour errors are monitored after a zero-speed passage.
Experience has shown that the error measuring time to be used for average acceleration
rates (approx. 2 to 50 mm/s
($AA_QEC_MEAS_TIME_2 = 3 * $AA_QEC_ TIME_1).
In the very low and high acceleration ranges, the error measuring time must be adapted.
This is done automatically according to the characteristic in the diagram below. The error
measuring time for small accelerations is set to six times the value of the decay time
($AA_QEC_MEAS_TIME_1 = 6 * $AA_QEC_ TIME_1); double the decay time
($AA_QEC_MEAS_TIME_3 = 2 * $AA_QEC_ TIME_1) is taken as the error measuring time
for larger accelerations.
442
Adaptation of the decay time
) corresponds to three times the value of the decay time
2
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions