Opr Method (5): Count 1 - Mitsubishi Electric QD70D4 User Manual

8 OPR CONTROL

8.2.7 OPR method (5): Count 1

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".)
Near-point dog ON is detected and deceleration starts at the time set in " OPR. 6 ACC/DEC time at OPR".
2)
3) 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 QD70D stops
4)
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
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
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The following shows an operation outline of the "count 1" OPR method.
Operation chart
V
Pr.6
1)
Near-point dog
ON
OFF
ON
OFF
OFF
Standby During OPR
Unfixed 0
Unfixed Traveled value is stored
Fig. 8.10 Count 1 machine OPR control
Deceleration at the near-point dog ON
OPR.4
OPR speed OPR.8
OPR.5
Bias speed at start
2) 3) 4) 5)
Md.2
ON
OFF
Zero signal
ON
Setting for the movement amount
after near-point dog ON
Creep speed
t
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
Pr.8 Deviation counter clear signal output time
Standby
Value marked
1
OP address
MELSEC-Q
1
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