Opr Method (1): Near-Point Dog Method - Mitsubishi Electric QD70D4 User Manual

8 OPR CONTROL

8.2.3 OPR method (1): Near-point dog method

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. 4 OPR speed".)
2) Near-point dog ON is detected and deceleration starts at the time set in " OPR. 6 ACC/DEC time at OPR".
The machine decelerates to the " OPR. 5 Creep speed", and subsequently moves at that speed.
3)
(At this time, the near-point dog must be ON.)
On detection of the first zero signal after near-point dog OFF, the pulse output from the QD70D stops immediately and
4)
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 signal" is output to the drive unit, the OPR complete flag ( Md. 7 Status: b1) turns from
5)
OFF to ON and the OPR request flag ( Md. 7 status: b0) turns from ON to OFF.
Machine OPR control start
(Positioning start signal: Y8 to YF)
OPR request flag
Md.7 Status: b0
OPR complete flag
Md.7 Status: b1
Deviation counter clear output
Md.4 Axis operation status
Md.2 Movement amount after
near-point dog ON
Md.1 Current feed value
8 - 5
The following shows an operation outline of the "near-point dog method" OPR method.
Operation chart
V
OPR.4
Pr.6 Bias speed at start
1)
Near-point dog
ON
OFF
ON
OFF
OFF
Standby During OPR
Unfixed 0
Traveled value is stored
Unfixed
Fig. 8.2 Near-point dog method machine OPR control
OPR speed Deceleration at the near-point dog ON
OPR.5
2) 3) 4) 5)
Md.2
ON
OFF
Zero signal
One motor rotation
ON
Pr.8
Standby
Value marked
OP address
MELSEC-Q
Creep speed
t
Movement amount after near-point dog ON
Adjust so the near-point dog OFF position is
as close as possible to the center of the zero
signal HIGH level.
If the near-point dog OFF position overlaps
with the zero signal, the machine OPR control
stop position may deviate by one motor rotation.
Deviation counter clear signal output time
1
1
8 - 5