Siemens SINUMERIK 840C Installation Instructions Manual page 667

9 Drive Servo Start-Up Application (as from SW 3)
9.5.3 Conventional quadrant error compensation (as from SW 2)
Fig. 9.22 Compensating amplitude too high
Setting the compensa- If the compensation time constant used in the circularity test is too small, the test
tion time constant shows that the radius deviation is compensated for, for a short time at the qua-
drant transition points, but that larger radius deviations from the programmed ra-
dius again occur immediately after (see Fig. 9.23).
Fig. 9.23 Compensation time constant too small
If the value for the compensation time constant chosen for the circularity test is
too high, we see that the radius deviation at the quadrant transition points is com-
pensated for (it is assumed that the optimum compensating amplitude has been
found), but that after the quadrant transition point the radius deviation is less than
the programmed radius (see Fig. 9.24).
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SINUMERIK 840C (IA)