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num parameter manual - Documentation CN

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8.2.4 Spindle Speed Control by Bidirectional Servo-Loop<br />

Control is by a reversible servo-drive only.<br />

The current position approaches the indexed position.<br />

The speed setting is calculated by:<br />

P45 is expressed in rpm/rev, i.e. 1/min.<br />

8 - 6 en-938818/4<br />

Spindle reference = Position error x P45<br />

The speed reference computed is then clipped to a limit speed defined by <strong>parameter</strong> P43 or specified by the<br />

programmed value (G92 S.. «Spindle speed limit in rpm/rev»), whichever is smaller.<br />

The servo-control phase starts when the M19 report is a 1, after detection of a measured spindle speed less than P43.<br />

The current position is beyond the limit position.<br />

The system returns the spindle to the limit position. The system is continuously servo-controlled.<br />

Function<br />

M19<br />

Programmed speed S..<br />

Limit speed<br />

P43<br />

M19 output<br />

to machine<br />

processor<br />

Zero<br />

spindle<br />

speed<br />

setting<br />

Servo-control phase<br />

Slope set<br />

by P45<br />

Transmission of<br />

CRM1 to CRM8 or<br />

CRM to the <strong>CN</strong>C<br />

Spindle reference<br />

In-position window<br />

P44<br />

POSBR1 to POSBR4 = 1<br />

Position error

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