Mitsubishi Electric MELSEC iQ-R RD75P4, User Manual

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2 OPR CONTROL
2.2 Machine OPR
Near-point dog method
The following shows an operation overview of the near-point dog method, one of the OPR methods.
Operation chart
Restrictions
A pulse generator with a zero signal is required. When using a pulse generator without a zero signal, produce a zero signal
using an external signal.
(1) The machine OPR is started.
(The machine starts accelerating according to the setting of [Pr.51] OPR acceleration time selection in the direction specified in [Pr.44] OPR direction, and
moves at the speed set in [Pr.46] OPR speed when the acceleration is completed.)
(2) When the on state of the near-point dog is detected, the machine starts decelerating.
(3) The machine decelerates to the speed set in [Pr.47] Creep speed and moves at the creep speed after that.
(During the deceleration, the near-point dog must be on. Otherwise the deceleration stop will occur.)
(4) After the near-point dog turns off and at the first input of zero signals, the RD75 stops outputting pulses and produces Deviation counter clear output to the
drive unit.
(Deviation counter clear signal output time is set in [Pr.55].)
(5) After Deviation counter clear output is completed, OPR complete flag ([Md.31] Status: b4) turns on and OPR request flag ([Md.31] Status: b3) turns off.
t
ON
OFF
OFF
ON
OFF
OFF
ON
0
V
ON
Md.34
Pr.46
Pr.47
Md.34
Md.20
Md.21
Md.26
Md.31
Md.31
Pr.55
(1) (2) (3) (4)(5)
OPR speed
Deceleration at the near-point dog ON
Creep speed
Standby
OPR Standby
Inconsistent
Movement amount
after near-point dog ON
Inconsistent
A value of the movement amount is stored. OP address
Current feed value
Zero signal
Value of *1
Deviation counter clear output
Movement amount after near-point dog ON
*1
Near-point dog
One servomotor rotation
OPR request flag
OPR complete flag
Machine feed value
Adjust so that 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 Zero signal, the machine OPR stop position
may deviate by one servomotor rotation.
Machine OPR start
(Positioning start signal)
[Y10, Y11, Y12, Y13]
Status: b3
Status: b4
Axis operation status
Deviation counter clear signal output time