
4. REFERENCE POSITION ESTABLISHMENT
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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–rota-
tion signals received from the position detector.
In that case, manual reference position return always establishes a
workpiece coordinate system based on the workpiece origin offsets,
specified with parameters No. 1220 to 1226.
The following signals relate with the manual reference position return:
Manual Reference Position Return
Mode selection MD1, MD2, MD4
Selection of reference position return ZRN, MREF
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, ...
Completion signal for reference
position return
ZP1, ZP2, ZP3, ...
Reference position establishment
signal
ZRF1, ZRF2, ZRF3, ...
(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,…) “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,…) 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).
4.1
MANUAL
REFERENCE
POSITION RETURN
General
D Automatic coordinate
setting
Basic Procedure for
Manual Reference
Position Return