
4.REFERENCE POSITION ESTABLISHMENT B-63783EN-1/01
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4.1 MANUAL REFERENCE POSITION RETURN
General
The tool is moved in the direction specified in parameter ZMI (bit 5 of
No. 1006) for each axis by turning the feed axis and direction select
signal to "1" in the manual reference position return mode, and is
returned to the reference position.
Manual reference position return is performed by using a grid method.
The reference position is based on an electrical grid, using on one-
rotation signals received from the position detector.
The following signals relate with the manual reference position return:
Mode selection J
Selection of reference position return ZRN, MZRN
Selection of axis to be moved
Selection of direction to be moved
+J1, -J1, +J2, -J2, +J3, -J3, ...
Selection of speed to be moved ROV1, ROV2
Deceleration signal for reference
position return
*DEC1, *DEC2, *DEC3, ...
Reference position nearly signal *NZ1, *NZ2, *NZ3, ...
Completion signal for reference
position return
ZP1, ZP2, ZP3, ...
Reference position establishment
signal
ZRF1, ZRF2, ZRF3, ...
Second, Third and Fourth reference
position return end signals
ZP21, ZP22, ZP23, ...
ZP31, ZP32, ZP33, ...
ZP41, ZP42, ZP43, ...
Basic Procedure for Manual Reference Position Return
(1) Select the JOG mode or TEACH IN JOG mode, and set the
manual reference position return selection signal ZRN to "1".
(2) Feed a target axis toward the reference position by making an
appropriate feed axis and direction selection signal (+J1, -J1, +J2,
-J2,0) "1".
(3) While the feed axis and direction selection signal is "1", rapid
traverse takes place along that axis. Although the rapid traverse
override signals (ROV1, ROV2) are valid, the override is
generally set to 100%.
(4) When the reference position is approached, a limit switch
installed on the machine is turned on, making the deceleration
signal (*DEC1, *DEC2, *DEC3,0) for reference position
deceleration "0". Consequently, the feedrate is decelerated to 0,
then the tool is fed at a constant low speed (reference position
return FL feedrate specified by parameter (No. 1425) setting).
(5) When the deceleration signal turns to "1" again after the limit
switch for deceleration is passed, the tool is fed with the feedrate
unchanged, then the tool stops at the first grid point (electric grid
point).