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

Count method 1

The following shows an operation overview of Count method 1, one of the OPR methods. If a machine OPR operation is
started using Count method 1 from a point where the near-point dog is on, the machine moves in the direction reverse to the
OPR direction to go back to a point where the near-point dog turns off, and a normal machine OPR operation is performed.
The machine OPR can be performed using Count method 1 even in the following situations.
• Where the near-point dog is on
• After the machine OPR is completed
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
(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.
(4) When the first zero signal is detected after the axis has traveled the movement amount set in [Pr.50] Setting for the movement amount after near-point dog
ON from the point where the near-point dog is 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].)
(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.
2 OPR CONTROL
52
2.2 Machine OPR
V
Pr.46
OPR speed
(1)
Near-point dog
OFF
Zero signal
ON
OFF
ON
OFF
OFF
Standby OPR
0
Inconsistent
A value of the movement amount is stored.
Inconsistent
Setting for the movement amount
Pr.50
after near-point dog ON
Pr.47 Creep speed
t
(2) (3) (4)(5)
Md.34 Movement amount after near-point dog ON
Have sufficient distance from the OP position
to the near-point dog OFF.
ON
Adjust the setting so that the object position after traveling
of the set movement amount after near-point dog ON is as
close as possible to the center of the zero signal HIGH level.
If the position overlaps with Zero signal, the machine OPR
stop position may deviate by one servomotor rotation.
First zero signal after the object traveling of
the movement amount set to Pr.50 Setting
for the movement amount after near-point
dog ON
One servomotor rotation
ON
Pr.55 Deviation counter clear signal output time
Standby
Value of *1
OP address
*1