Opr Method (6): Count Method 2) - Mitsubishi Electric QD75P1N User Manual

8 OPR CONTROL

8.2.8 OPR method (6): Count method 2)

The machine OPR is started.
(The machine begins the acceleration designated in " Pr.51 OPR acceleration time selection", in the
1)
direction designated in " Pr.44 OPR direction". It then moves at the " Pr.46 OPR speed" when the
acceleration is completed.)
2) The machine begins decelerating when the near-point dog ON is detected.
3) The machine decelerates to the " Pr.47 Creep speed", and subsequently moves at that speed.
The pulse output from the QD75 will stop and the machine OPR will be completed when the machine
moves the movement amount set in " Pr.50 Setting for the movement amount after near-point dog ON "
4)
from the near-point dog ON position.
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
OPR request flag
Md.31 Status: b3
OPR complete flag
Status: b4
Md.31
Md.26 Axis operation status
Movement amount
Md.34
after near-point dog ON
Current feed value
Md.20
Machine feed value
Md.21
The following shows an operation outline of the "method 2)" OPR method.
The "count method 2)" method is effective when a "zero signal" cannot be received.
(Note that compared to the "count method 1)" method, using this method will result in
more deviation in the stop position during machine OPR.)
In the "count method 2)", as well as in the "count method 1)", machine OPR can be
performed even in the following situations:

when near-point dog is ON

after completion of a machine OPR
Operation chart
V
1)
Near-point dog
ON
OFF
ON
OFF
OFF
OPR
Standby
0
Inconsistent
Value the machine moved is stored
Inconsistent
Fig. 8.14 Count method 2) machine OPR
Pr.46 OPR speed
Pr.50
2) 3)
ON
OFF
8 - 20
MELSEC-Q
Setting for the movement amount
after near-point dog ON
Pr.47 Creep speed
t
4)
Movement amount after near-point
dog ON
*1
Md.34
Leave sufficient distance from
the OP position to the near-point
dog OFF
ON
Standby
Value of *1
OP address