Further Optimization And Intervention Options - Siemens SINUMERIK 840C Installation Instructions Manual

9 Drive Servo Start-Up Application (as from SW 3)
9.5.4 Neural quadrant error compensation (QEC – SW 4)

9.5.4.2 Further optimization and intervention options

Checking methods
1st method:
2nd method:
3rd method:
Table:
Compensation not adequate
Overcompensation in the lower
and middle range
Over compensation in the upper
range
Large fluctuations in
compensation: sometimes
overcompensation, sometimes
undercompensation
9–58
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Circularity test
Display of characteristic – in this display, the compensation amplitude is output
as a % of the maximum speed as a function of the set memory partitioning.
Record the learning process for a difficult acceleration (derived from the
SERVICE quadrant error compensation display) with SERVO trace. The following
SERVO trace parameterization is recommended:
Measuring times, trigger conditions:
Trace 2, 3, 4 with start trigger Trace 1, measuring time 200 ms, triggering
time–50 ms
Trace 1: Edge signal  threshold for positive passage through zero, edge signal
 threshold for negative passage through zero at threshold = 0.
Trace signals:
Trace 1:
Trace 2:
Trace 3:
Trace 4:
Examination of Trace 2 and 3:
S
If the bump can be seen in following error and not in learning criterion QEC,
the measuring time in the area examined must be increased.
S
If the bump can be clearly seen in learning criterion QEC and a later fault is
also included, the measuring time must be reduced.
S
If vibrations are contained in the following error at the time of the passage
through zero, they must be eliminated by trying other control settings. A very
high position setpoint smoothing can only be considered a solution during the
automatic learning stage. Conditions can also be improved by reducing the
measuring time.
Possible errors and how they can be eliminated
Error:
Circularity test
S
S
S
S
S
S
S
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Partial setpoint FIPO output (for triggering only)
Following error
Learning criterion QEC
Quadrant error
Recognized by:
Circularity test
Display of the characteristic:
Overshooting in this range
Circularity test
Display of the characteristic:
Overshooting in this range
Check with SERVO Trace
Circularity test
Display of the characteristic:
Large fluctuations
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Remedial action:
Increase the learning rate or
increase number of learning
passes
Increase measuring time in this
range (MD 1372*, MD 1376*)
Check the following error and
learning criteria QEC with
SERVO Trace or DAC output and
adapt the measuring time in this
range on the basis of that
information (MD 1380*)
Decrease learning rate, restart
learning process (with fewer
learning passes)
SINUMERIK 840C (IA)
09.95