Siemens SINUMERIK 840C Installation Instructions Manual page 897

12 Functional Descriptions
12.16.3 Installation
Figure 5 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 compensated for (it is assumed
that the optimum compensating amplitude has been found), but that after the quadrant
transition point the radius deviation is less that the programmed radius (see Figure 6).
Figure 6 Compensation time constant too large
If it is not possible to find a uniform compensation time constant for the various radii and
velocities, the average value of the derived time constants is used.
If it has been possible to achieve a good result with these time constants and the constant
compensating amplitude across the whole working range, i.e. for all required radii and
velocities and for positioning, characteristic adaptation (MD 1804*, bit 7) is no longer needed.
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