MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 290)

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MELSEC-Q
8 OPR CONTROL
Restrictions
(1) Always limit the servomotor torque after the " Pr.47 Creep speed" is reached. If the
torque is not limited, the servomotor may fail when the machine presses against the
stopper. (Refer to Section 12.4.2 "Torque limit function".)
(2) Use an external input signal as the zero signal.
(3) In the "stopper method 2)", the OPR retry function is unusable.
Precautions during operation
(1) Input a zero signal from an external source after the machine presses against the
stopper.
The workpiece will continue decelerating and stop if a zero signal is input before
deceleration to the " Pr.47 Creep speed". An error "OP detection timing fault (error
code: 204)" will occur after the machine stops.
(2) The near-point dog must be turned ON until it presses against the stopper.
t
V
ON
OFF
ON
OFF
OFF
0
ON
In error
Pr. 46 OPR speed
Pr. 47 Creep speed
Zero signal
Near-point dog OFF
In OPR
Value the machine moved is stored
Inconsistent
Inconsistent
Standing by
Address at stop
Machine OPR start
(Positioning start signal)
OPR request flag
[ Md.31 Status : b3]
OPR complete flag
[Md.31 Status : b4]
Md.34 Movement amount
after near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
Md.26 Axis operation status
Stops at stopper
Fig. 8.8 Operation when a zero signal is input before the creep speed is reached