Stopper Method 1 - Mitsubishi Electric MELSEC iQ-R-RD75P4 User Manual

Stopper method 1

The following shows an operation overview of the stopper method 1, one of the OPR methods.
Operation chart
Machine OPR start
(Positioning start signal)
[Y10, Y11, Y12, Y13]
OPR request flag
Md.31 Status: b3
OPR complete flag
Md.31 Status: b4
Deviation counter clear output
Md.26 Axis operation status
Movement amount
Md.34 after near-point dog
ON
Md.20 Current feed value
Md.21 Machine feed value
Torque limit stored
Md.35
value
(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.
(The torque must be limited for this operation. Otherwise the servomotor may be damaged in step (4).)
(4) The machine presses the workpiece against the stopper at the creep speed and stops.
(5) When the time set in [Pr.49] OPR dwell time has elapsed after the near-point dog was turned on, 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].)
(6) 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.
Restrictions
Always limit the servomotor torque after the speed reaches the speed set in [Pr.47] Creep speed.
Otherwise the servomotor may be damaged when the workpiece hits to the stopper. (Page 232 Torque limit function)
2 OPR CONTROL
44
2.2 Machine OPR
V
Pr.46 OPR speed
(1)
Torque limit
OFF
Near-point dog
ON
OFF
ON
OFF
OFF
OPR
Standby
Inconsistent 0
Inconsistent
A value of the movement amount is stored.
Inconsistent
Torque limit setting value
Pr.47 Creep speed
Stops with a stopper.
t
(2) (3) (4) (5)(6)
Range in which the servomotor rotation is
forcibly stopped with a stopper
Torque limit valid range
ON
Dwell time
Time out of dwell time
measurement
ON
Deviation counter clear signal
Pr.55
output time
Standby
OP address
OPR torque limit value