Count Method - Mitsubishi Electric MELSEC Q Series User Manual

8.3

Count Method

This section describes the operation overview of an OPR method, "count method".
OPR in the count method can be executed also in case of the following.
• OPR on the near-point dog ON
• Another OPR after completion of OPR
(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.
3
The machine decelerates to "
Output from the QD73A1 stops at the first Zero signal after the machine moved by the amount set in "
4
for the movement amount after near-point dog ON".
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 machine moved the amount set in "
after near-point dog ON", 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 OPR speed
v
1
Near-point dog
Zero signal
ON
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
(X15)
OFF
0
Inconsistent
(Updated according to the movement)
Inconsistent
Executed by the QD73A1
Setting for the movement amount
Pr.13
Deceleration at the near-point dog ON
Pr.12 Creep speed
2
Pr.13 Setting for the movement amount after near-point dog
ON
4
5
3
Returning operation is executed by the coasting
amount after Zero signal input, and the OPR is
completed.
Movement amount after near-point dog ON
ON
Adjust
OFF
after near-point dog ON so that it is closer to the
center of Zero signals.
If it overlaps with Zero signal, the OPR stop
position may deviate by one servomotor rotation.
One servomotor
rotation
ON
0 Value of *1
OP address
CHAPTER 8 OPR CONTROL
Setting
Pr.13
t
*1
Pr.13 Setting for the movement amount
181
8