
Mechanical
stopper
Current position
(A) The tool is moved along a specified axis with a limited torque until
it butts against the mechanical stopper.
The tool is moved in the direction specified with
PRM1006#5(ZMIx), at the feedrate specified with PRM7183, at the
torque specified with PRM7186 (until the tool strikes the
mechanical stopper).
16. DIGITAL SERVO
843
16.6.3 Butt–type reference position setting
This function automates the procedure of butting the tool against a
mechanical stopper on an axis to set a reference position. The purpose of
this function is to eliminate the variations in reference position setting that
arise depending on the operator, and to minimize work required to make fine
adjustments after reference position setting.
Select the axis for which the reference position is to be set, then perform
cycle start. Then, the following operations are performed automatically:
(1) The torque (force) of the selected axis is reduced to make the butting
feedrate constant, and the tool is butted against the mechanical stopper.
Then, the tool is withdrawn a parameter–set distance from the
mechanical stopper.
(2) Again, the torque (force) of the selected axis is reduced, and the tool is
butted against the mechanical stopper. Then, the tool is withdrawn a
parameter–set distance from the mechanical stopper.
(3) The withdrawal point on the axis is set as the reference position.
D Basic procedure for butt–type reference position setting
(1) First, set the parameters required for butt–type reference position
setting.
PRM1006#5 (ZMIx): Direction of reference position setting
PRM1015#2 (OKI): After completion of reference position return
operation, ALM000 is, issued (0)/not issued (1)
(When setting a butt–type reference position on
an axis without an absolute–position detector,
set this bit to 1.)
PRM7181: Withdrawal distance
PRM7182: Reference position setting distance
PRM7183: Butting feedrate 1
PRM7184: Butting feedrate 2
PRM7185: Withdrawal feedrate in reference position setting
PRM7186: Torque limit
(2) Select manual reference position return mode.
(3) By using a manual handle feed axis select signals (HS1A–D
<
QG0145 - +3
>), select the axis on which the reference position is to be
set.
(4) Perform cycle start.
This starts the cycle operation for reference position setting.
(5) During the cycle operation, the automatic operation start signal OP is 1.
D
Cycle operation
When no reference position has been set, operations (A) to (E), below,
are performed automatically to set a reference position.