Opr Method (6): Count 2 - Mitsubishi Electric QD70D4 User Manual

8 OPR CONTROL

8.2.8 OPR method (6): Count 2

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)
The machine decelerates to the " OPR. 5 Creep speed", and subsequently moves at that speed.
3)
As soon as 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 (at this time, the axis decelerates to a
stop from " OPR. 5 Creep speed" at the time set in " OPR. 7 DEC/STOP time at OPR") and the "deviation counter clear
4)
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
Status: b0
Md.7
OPR complete flag
Status: b1
Md.7
Deviation counter clear output
Md.4 Axis operation status
Movement amount after
Md.2
near-point dog ON
Md.1 Current feed value
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The following shows an operation outline of the "count 2" OPR method.
The "count method 2)" method is effective when a "zero signal" cannot be received.
Operation chart
V
Pr.6
1)
Near-point dog
ON
OFF
ON
OFF
OFF
During OPR
Standby
Unfixed 0
Traveled value is stored
Unfixed
Fig. 8.11 Count 2 machine OPR control
Deceleration at the near-point dog ON
OPR.4
OPR speed OPR.8
Bias speed at start
2) 3) 4) 5)
ON
OFF
Setting for the movement amount
after near-point dog ON
OPR.5 Creep speed
t
Md.2
Movement amount after near-point dog ON
Leave sufficient distance from the OP
position to the near-point dog OFF
ON
Deviation counter clear signal output time
Pr.8
Standby
Value marked 1
OP address
MELSEC-Q
1
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