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8 OPR CONTROL
8.2.6 OPR method (4): Stopper 3
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",
1)
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.)
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 QD70D stops immediately and the "deviation
3)
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
4)
OFF to ON, and the OPR request flag ( Md. 7 Status: b0) turns from ON to OFF.
Zero signal
Torque limit
Machine OPR control start
(Positioning start signal: Y8 to YF)
OPR request flag
Status: b0
Md.7
OPR complete flag
Md.7
Status: b1
Deviation counter clear output
Md.4
Axis operation status
Movement amount after
Md.2
near-point dog ON
Md.1
Current feed value
8 - 12
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
V
Pr.6
1)
ON
OFF
ON
OFF
OFF
Standby
During OPR
Unfixed
0
Standby
Traveled value is stored
Fig. 8.8 Stopper 3 machine OPR control
OPR.5
Creep speed
Bias speed at start
2) 3) 4)
MELSEC-Q
Stopper
t
ON
Deviation counter clear signal output time
Pr.8
Standby
OP address
8 - 12
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