
B-63783EN-1/01 4.REFERENCE POSITION ESTABLISHMENT
- 443 -
The following figure shows the positional relation between the
reference position and the point to which the tool is positioned by
manual continuous feed.
Servo position error and one-rotation signal
To set the reference position without dogs, 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.
1841. The tool must cross the grid line corresponding to a one-rotation
signal from the position detector.
Section 4.1 explains how to calculate the servo position error.
NOTE
An axis does not work when the reference position
without dog is set without satisfying the above
condition.
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 Nos.
1816#0 to 3 or 1896).
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 with the feed axis and direction selection signal.
The completion signal for reference position return is then set to 1.
Grid
- direction
Position
after jog feed
×
+ direction
: Reference position for reference position return in the negative
direction
B: Reference position for reference position return in the positive
direction
B