
4. REFERENCE POSITION ESTABLISHMENT
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(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).
(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).
(6)Upon confirmation that the current position is in the in–position area,
the reference position return end signal (ZP1, ZP2, ZP3,…) and the
reference position establishment signal (ZRF1, ZRF2, ZRF3,…) turn
to “1”.
Step (2) and subsequent steps are performed independently for each axis.
The number of simultaneously controlled axes is usually one, but it
becomes two by parameter JAX (No. 1002#0). (simultaneously three axes
for Power Mate i–H)
If the feed axis direction selection signal (+J1, –J1, +J2, –J2,…) turns to
“0” between step (2) and (5) , the tool is stopped at once, and reference
position return is assumed to be canceled. If the signal turn to “1” again,
operation resumes from step (3) (rapid traverse).
The timing charts for the basic procedures are given below.
ZRN
+J1
*DEC1
Grid
ZP1
ZRF1
Feedrate
Rapid traverse rate
FL rate
JOG or TEACH IN JOG/HANDLE mode