Справочник Пользователя для Mitsubishi Electronics QD75P4
8 - 7
MELSEC-Q
8 OPR CONTROL
8.2.3 OPR method (1): Near-point dog method
The following shows an operation outline of the "near-point dog method" OPR method.
Operation chart
1)
The machine OPR is started.
(The machine begins the acceleration designated in " Pr.51 OPR acceleration time selection", in the direction
designated in " Pr.44 OPR direction". It then moves at the " Pr.46 OPR speed" when the acceleration is completed.)
(The machine begins the acceleration designated in " Pr.51 OPR acceleration time selection", in the 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.
(At this time, the near-point dog must be ON. The workpiece will continue decelerating and stop if the near-point dog is
OFF.)
(At this time, the near-point dog must be ON. The workpiece will continue decelerating and stop if the near-point dog is
OFF.)
4)
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.
(The "deviation counter clear signal output time" is set in Pr.55 .)
"deviation counter clear signal" to the drive unit.
(The "deviation counter clear signal output time" is set in Pr.55 .)
5)
After a "deviation counter clear signal" is output to the drive unit, the OPR complete flag ( Md.31 Status: b4) turns from
OFF to ON and the OPR request flag ( Md.31 Status: b3) turns from ON to OFF.
OFF to ON and the OPR request flag ( Md.31 Status: b3) turns from ON to OFF.
t
ON
OFF
OPR speed
Deceleration at the near-point dog ON
Creep speed
ON
OFF
OFF
ON
Standby
OPR
Standby
Inconsistent
0
Movement amount after
near-point dog ON
near-point dog ON
Inconsistent
Value of the machine moved is stored.
OP address
Current feed value
V
Zero signal
Value of *1
Deviation counter clear output
Movement amount after
near-point dog ON
near-point dog ON
Near-point dog
ON
OFF
One servomotor rotation
*
1
OPR request flag
OPR complete flag
Md.34
1)
2)
3)
4) 5)
Pr.46
Pr.47
Md.34
Md.20
Md.21
Md.26
Md.31
Md.31
Pr.55
Machine feed value
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.
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.
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
(Positioning start signal)
[Y10,Y11,Y12,Y13]
Status: b3
Status: b4
Axis operation status
Deviation counter clear
signal output time
signal output time
Fig. 8.2 Near-point dog method machine OPR