
B-63943EN-1/02 4.REFERENCE POSITION ESTABLISHMENT
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4.2 REFERENCE POSITION SETTING WITHOUT DOG
Overview
This function moves each axis in the manual continuous feed mode
near the reference position. It then sets the reference position in the
reference position return mode without the deceleration signal for
reference position return. This is done by setting the feed axis and
direction select signal to "1". With this function, the machine
reference position can be set at a given position without installing the
limit switches for reference position return.
If the absolute-position detector is provided, the set reference position
is retained after the power is turned off. In this case, when the power
is turned on again, there is no need for setting the reference position
again.
Explanation
- Basic Procedure for Setting the Reference Position Without DOG
(1) Feed the tool, along the axis for which the reference position is to
be set, by manual continuous feed in the reference position return
direction. Stop the tool near the reference position, but do not
exceed the reference position.
(2) Enter manual reference position return mode, then set 1 for the
feed axis direction selection signal (for the positive or negative
direction) for the axis.
(3) The CNC positions the tool to the nearest grid line (based on
one-rotation signals from the position detector) in the reference
position return direction specified with parameter ZMIx (No.
1006#5). The point at which the tool is positioned becomes the
reference position.
(4) The CNC checks that the tool is positioned to within the
in-position area, then sets the completion signal (ZP1) for
reference position return and the reference position establishment
signal (ZRF1) to 1.
The timing chart for the basic elements constituting steps (2) to (4) is
shown below.
+J1 or -J1
Grid
ZP1
Feedrate
Manual reference position return
mode
FL rate
.
.
.
.
ZRF1