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CHAPTER 8 OPR CONTROL
8
8.2 Near-point Dog Method
8.2 Near-point Dog Method
This section describes the operation overview of an OPR method, "near-point dog method".
(1) Operation chart
As in the following figure, after the near-point dog turned off, the position of the first Zero signal from the pulse
generator becomes the OP.
1
OPR starts.
(Acceleration starts in the direction set on "OPR direction setting" in the switch setting, and the machine moves at
" OPR speed".)
2 As the near-point dog turns on, deceleration starts.
3
The machine decelerates to " Creep speed", and subsequently moves at the creep speed.
(The near-point dog must be on during the deceleration. If the near-point dog turns off during the deceleration, the
OPR is completed at the first Zero signal input after the near-point dog OFF.)
4 Output from the QD73A1 stops at the first Zero signal after the near-point dog OFF.
5
Returning operation is executed by the coasting amount after Zero signal input, then OPR complete signal (X13) turns
on and OPR request signal (X12) turns off.
Pr.11
Pr.12
1
2
3
4
5
t
v
ON
OPR start signal (Y20)
OPR request signal (X12)
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Inconsistent
0
OPR speed
OFF
Inconsistent
BUSY signal (X14)
OPR complete signal (X13)
In-position signal (X16)
Positioning complete signal
(X15)
(Updated according to the movement) OP address
Pr.11
Deceleration at the near-point dog ON
Pr.12 Creep speed
Returning operation is executed by the
coasting amount after Zero signal input,
and the OPR is completed.
Movement amount after near-point dog ON
*1
Near-point dog
Zero signal
One servomotor
rotation
Adjust the position where the near-point
dog turns off so that it is closer to the
center of Zero signals.
If the position overlaps with Zero signal,
the OPR stop position may deviate by
one servomotor rotation.
Md.6
Movement amount after near-point
dog ON
Md.22
Movement amount after near-point
dog ON (absolute value)
Md.1 Current feed value
Executed by the QD73A1
0 Value of *1