Mitsubishi QD75P1N - Page 305

8 - 13
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.
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.
t
OPR speed
Creep speed
V
Zero signal
ON
OFF
ON
OFF
OPR request flag
OFF
OPR complete flag
Standby
OPR
Inconsistent
0
Movement amount
after near-point dog ON
Inconsistent
Value the machine moved is stored
Current feed value
Near-point dog
ON
OFF
Error
Address at stop
Md.34
Md.20
Md.21
Pr.46
Pr.47
Status : b3
Status : b4
Md.31
Md.31
Md.26
Stopper
Machine feed value
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
Axis operation status
Fig. 8.8 Operation when a zero signal is input before the creep speed is reached