Siemens SINUMERIK 840C Installation Instructions Manual page 673

9 Drive Servo Start-Up Application (as from SW 3)
9.5.4 Neural quadrant error compensation (QEC – SW 4)
D Saving and loading NQEC data
9–52
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Fig. 9.28
Values a1 (lower range limit) and a2 (medium range limit) can be parameterized
(see Function parameters softkey), a3 (max. acceleration) is the upper limit of
the parameterized operating range. The standard settings for the limits of the op-
erating range are as follows:
a1 = 2 %
a2 = 60 % of parameterized maximum acceleration
The parameter settings of a1 and a2 should only be changed if the compensatory
effect in certain acceleration ranges is insufficient.
This can be assumed to be the case if the learned characteristic in one of the 3
ranges, 1, 2 or 3, deviates sharply from the diagram shown above while having a
very uniform shape in one or both of the other ranges. The characteristic can be
checked by selecting the Display softkey.
The MDD functions "Save all" and "Load all" have been extended to include the
NQEC functions.
With "Save all", the NQEC parameterization including the measured values are
read from the NCK/servo and stored in the ASCII files under the selected name.
With "Load all", the selected NQEC ASCII files are read in and stored as boot
files. Using a method similar to TEA3-Load all, a back-up mechanism is imple-
mented which is able to regenerate the original NQEC boot files automatically on
power loss, emergency stop, disk full, abort key or similar occurrences.
New alarms for this function: 165051 to 165054.
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Interval width
1 2 3
a a
1 2
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Acceleration
a
3
SINUMERIK 840C (IA)
09.95
10.94