Siemens SINUMERIK 840D sl Function Manual page 417

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 5-18
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Compensation time constant too small
5.6 Friction compensation (quadrant error compensation)
K3: Compensation
417