Opr Method (1): Near-Point Dog Method - Mitsubishi QD75P1N User Manual

8 OPR CONTROL

8.2.3 OPR method (1): Near-point dog method

The machine OPR is started.
(The machine begins the acceleration designated in " Pr.51
1)
designated in " Pr.44
completed.)
2) The machine begins decelerating when the near-point dog ON is detected.
The machine decelerates to the " Pr.47
3)
(At this time, the near-point dog must be ON. The workpiece will continue decelerating and stop if the near-point dog is
OFF.)
After the near-point dog turns OFF, the pulse output from the QD75 will stop at the first zero signal,
outputting a "deviation counter clear signal" to the drive unit.
4)
(The "deviation counter clear signal output time" is set in
After a "deviation counter clear signal" is output to the drive unit, the OPR complete flag (
5)
b4) turns from OFF to ON and the OPR request flag (
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
OPR request flag
Md.31
OPR complete flag
Md.31
Deviation counter clear output
Axis operation status
Md.26
Md.34 Movement amount after
near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
The following shows an operation outline of the "near-point dog method" OPR method.
Operation chart
OPR direction". It then moves at the " Pr.46
V
1)
Near-point dog
ON
OFF
ON
OFF
Status: b3
OFF
Status: b4
OPR
Standby
0
Inconsistent
Value of the machine moved is stored.
Inconsistent
Fig. 8.2 Near-point dog method machine OPR
OPR acceleration time selection", in the direction
Creep speed", and subsequently moves at that speed.
Pr.55
Md.31
Pr.46 OPR speed
Deceleration at the near-point dog ON
Pr.47
2) 3) 4) 5)
Md.34
ON
OFF
Zero signal
One servomotor rotation
8 - 7
OPR speed" when the acceleration is
.)
Status: b3) turns from ON to OFF.
Creep speed
t
Movement amount after
1
*
near-point dog ON
Adjust so the near-point dog OFF
position is as close as possible to
the center of the zero signal HIGH level.
If the near-point dog OFF position
overlaps with the zero signal, the
machine OPR stop position may
deviate by one servomotor rotation.
ON
Deviation counter clear
Pr.55 signal output time
Standby
Value of *1
OP address
MELSEC-Q
Md.31
Status: