
4. REFERENCE POSITION ESTABLISHMENT
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+J1 or –J1
Grid
ZP1
ZRF1
Feedrate
.
Manual reference
position return
mode
FL rate
.....
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 jog feed
+ direction
Reference position for reference position return in the negative direction
Reference position for reference position return in the positive direction
AB
A
B
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. 1836. 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.
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).
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.
Servo position error and
one–rotation signal
Grid shift
Reference position
return