Siemens SINUMERIK 840D sl Function Manual page 401

Amplitude too high
When the injection amplitude setting is too high, radius deviations at quadrant transitions are
manifestly overcompensated at quadrant transitions.
Figure 5-23
Time constant too low
When the compensation time constant settings are too low, radius deviations are
compensated briefly at quadrant transitions during circularity testing, but are followed
immediately again by greater radius deviations from the programmed radius.
Figure 5-24
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Amplitude too high
Compensation time constant too small
5.6 Friction compensation (quadrant error compensation)
Compensations (K3)
401