Near-Point Dog Method - Mitsubishi Electric MELSEC Q Series User Manual

8.2

Near-point Dog Method

This section describes the operation overview of an OPR method, "near-point dog method".
(1) Operation chart
OPR starts.
(Acceleration starts in the direction set on "OPR direction setting" in the switch setting, and the machine moves at
1
" OPR speed".)
Pr.11
2 As the near-point dog turns on, deceleration starts.
The machine decelerates to "
3
(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.
Returning operation is executed by the coasting amount after Zero signal input, then OPR complete signal (X13) turns
5
on and OPR request signal (X12) turns off.
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.
OPR start signal (Y20)
OPR request signal (X12)
BUSY signal (X14)
OPR complete signal (X13)
In-position signal (X16)
Positioning complete signal
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
Creep speed", and subsequently moves at the creep speed.
Pr.12
Pr.11
v
1
Near-point dog
Zero signal
ON
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
(X15)
0
Inconsistent
(Updated according to the movement)
Inconsistent
Executed by the QD73A1
Deceleration at the near-point dog ON
OPR speed
2
Pr.12 Creep speed
4
5
3
ON
Movement amount after near-point dog ON
OFF
One servomotor
rotation
ON
0 Value of *1
OP address
CHAPTER 8 OPR CONTROL
t
Returning operation is executed by the
coasting amount after Zero signal input,
and the OPR is completed.
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.
179
8
*1