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num parameter manual - Documentation CN

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6.13 Servo-Loop Error Tolerated on Circles P52<br />

6 - 32 en-938818/7<br />

Category Miscellaneous<br />

Type 5 Unsigned decimal<br />

No. of words 1<br />

Description<br />

Defines the maximum servo-loop error tolerated on circles.<br />

The basic value is 50 μm.<br />

Principle<br />

εa (servo-loop error) is the error in mm between a programmed path and the real path.<br />

R<br />

εa<br />

εa is expressed by the following equation:<br />

Where:<br />

- εa Servo-loop error (in m),<br />

- Vmax Max speed (in m/s)),<br />

- Τ Time constant (in s),<br />

- R Radius (in m).<br />

εa = Vmax 2 x Τ 2 / 2R<br />

Programmed<br />

path<br />

Real path

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