Opr Method (4): Stopper 3 - Mitsubishi Electric MELSECQ Series User Manual

8 OPR CONTROL

8.2.6 OPR method (4): Stopper 3

1)
2)
3)
4)
Zero signal
Torque limit
Machine OPR control start
(Positioning start signal: Y8 to YF)
OPR request flag
Md.7
OPR complete flag
Md.7
Deviation counter clear output
Md.4
Md.2
Md.1
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The following shows an operation outline of the "stopper 3" OPR method.
The "stopper 3" method is effective when a near-point dog has not been installed.
(Note that the operation is carried out from the start at the " OPR. 5 Creep speed", so it
will take some time until the machine OPR control completion.)
Operation chart
Machine OPR control is started.
(Acceleration starts in the direction set in " OPR. 2 OPR direction" at the time set in " OPR. 6 ACC/DEC time at OPR",
and the axis moves at " OPR. 5 Creep speed". At this time, the motor torque must be limited. If the torque is not limited,
the motor may fail at 2.)
The machine presses against the stopper at the creep speed and stops.
On detection of the zero signal after the stop, the pulse output from the QD70 stops immediately and the "deviation
counter clear output" is output to the drive unit.
(The "deviation counter clear signal output time" is set in Pr. 8 .)
After a "deviation counter clear output" is output to the drive unit, the OPR complete flag ( Md. 7 Status: b1) turns from
OFF to ON, and the OPR request flag ( Md. 7 Status: b0) turns from ON to OFF.
OFF
OFF
Status: b0
OFF
Status: b1
Standby
Axis operation status
Movement amount after
Unfixed
near-point dog ON
Current feed value Standby
Fig. 8.8 Stopper 3 machine OPR control
search engine
V
OPR.5 Creep speed
Pr.6
Bias speed at start
1)
ON
ON
During OPR
0
Traveled value is stored
MELSEC-Q
Stopper
t
2) 3) 4)
ON
Pr.8 Deviation counter clear signal output time
Standby
OP address
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