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num parameter manual - Documentation CN

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6.14 Very High Speed Machining P19<br />

6 - 34 en-938818/7<br />

Category Servo-control<br />

Type 1 Signed decimal<br />

No. of words 96<br />

Description<br />

This <strong>parameter</strong> is used to set:<br />

- the acceleration anticipation for each axis,<br />

- the dry friction correction amplitude for each axis,<br />

- tThe dry friction correction time constant for each axis.<br />

Principle<br />

Speed<br />

reference Ri<br />

Corrector<br />

Smoothed<br />

+<br />

speed +<br />

+<br />

reference Ri'<br />

Filter DAC<br />

-<br />

Measurement<br />

Words N0 to N31: Acceleration anticipation<br />

Each word corresponds to the physical address of an axis. The acceleration anticipation is expressed in μs. The order<br />

of magnitude is 400 μs.<br />

The acceleration anticipation Ka’ is applied in the following formula:<br />

Cor = Kv<br />

Ka<br />

( Ri − Ri − 2j − 1)<br />

+ ( Ri − Ri − 2j − 1 + Ri − 2j − 2 )<br />

2j+1 2j+1<br />

REMARK: The speed anticipation corrector "Kv" is set to 100 percent and cannot be<br />

modified.<br />

Words N32 to N63: Dry friction correction amplitude<br />

Each word corresponds to the physical address of an axis. The dry friction correction amplitude is expressed in internal<br />

measurement units. The order of magnitude is 10 μs.

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