
4.REFERENCE POSITION ESTABLISHMENT B-63943EN-1/02
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The following figure shows the positional relation between the
reference position and the point to which the tool is positioned by
manual continuous feed.
Grid
- direction
Position after
og feed
+ direction
: Reference position for reference position return in the negative direction
B : Reference position for reference position return in the positive direction
AB
- Servo position error and one-rotation signal
To set the reference position without DOG, when the reference
position has not yet been established. The tool must be fed, in manual
continuous feed mode, in the reference position return direction at
such a speed that the servo position error exceeds the value set in
parameter No. 1836. The tool must cross the grid line corresponding
to a one-rotation signal from the position detector.
Section "MANUAL REFERENCE POSITION RETUNR" explains
how to calculate the servo position error.
- Grid shift
To shift the reference position, the grid can be shifted by the distance
set in parameter No. 1850. The grid shift to be set in the parameter
must not exceed the reference counter capacity (parameter No. 1821).
Reference position shift function can not be used.
- Manual reference position return
When the feed axis and direction selection signal is set to 1 in manual
reference position return mode after the reference position has been
established, the tool is positioned to the reference position regardless
of the direction specified by the feed axis and direction selection
signal. The completion signal for reference position return is then set
to 1.
Caution
CAUTION
When a feed axis and direction selection signal is
selected in the manual reference position mode, the
tool may be positioned at the reference position
irrespective of the direction specified by the feed axis
and direction selection signal, depending on the
current position.