
B–64113EN–1/01
4. REFERENCE POSITION ESTABLISHMENT
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The tool is moved in the direction specified by parameter ZMI (bit 5 of
No. 1006) setting the feed axis and direction select signal to “1” during
manual reference position return mode. Movement will continue until the
reference position is obtained.
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.
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
+J1, –J1, +J2, –J2, +J3, –J3, ...
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 JOG mode or TEACH IN JOG mode, and the manual reference
position return selection signal ZRN to “1”.
(2)Feed a target axis toward the reference position by setting 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 activated, making the deceleration signal (*DEC1,
*DEC2, *DEC3,…) for reference position “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 returns to “1” again after the limit switch
is passed, the tool is continues to feed, until the tool stops at the first
grid point (electric grid point).
4.1
MANUAL
REFERENCE
POSITION RETURN
General
Basic Procedure for
Manual Reference
Position Return