Opr Method (5): Count 1 - Mitsubishi Electric MELSECQ Series User Manual

8 OPR CONTROL

8.2.7 OPR method (5): Count 1

1)
2)
3)
4)
5)
Machine OPR control start
(Positioning start signal: Y8 to YF)
OPR request flag
OPR complete flag
Deviation counter clear output
Md.4
Md.2
Md.1
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The following shows an operation outline of the "count 1" OPR method.
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. 4 OPR speed".)
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.
On detection of the first zero signal after the axis has traveled the movement amount set in " OPR. 8 Setting for the
movement amount after near-point dog ON" after near-point dog ON, 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.
V
OFF
OFF
Md.7 Status: b0
OFF
Md.7 Status: b1
Axis operation status Standby
Movement amount after Unfixed
near-point dog ON
Unfixed
Current feed value
Fig. 8.10 Count 1 machine OPR control
search engine
Deceleration at the near-point dog ON
OPR.4
OPR speed OPR.8
Bias speed at start
Pr.6
1) 2) 3) 4) 5)
ON
Near-point dog
OFF
Zero signal
ON
ON
During OPR
0
Traveled value is stored
MELSEC-Q
Setting for the movement amount
after near-point dog ON
Creep speed
OPR.5
t
Md.2 Movement amount after near-point dog ON
Leave sufficient distance from the OP
position to the near-point dog OFF
Adjust the setting for the movement amount after
near-point dog ON to be as near as possible to
the center of the zero signal HIGH.
If the setting for the movement amount after
near-point dog ON falls within the zero signal,
there may be produced an error of one motor
rotation in the machine OPR control stop position.
First zero signal after movement by the value
set to " OPR. 8 Setting for the movement
amount after near-point dog ON"
One motor rotation
ON
Pr.8 Deviation counter clear signal output time
Standby
Value marked 1
OP address
1
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