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8 OPR CONTROL
8.2.7 OPR method (5): Count method1)
The machine OPR is started.
(The machine begins the acceleration designated in "
1)
designated in "
completed.)
2)
The machine begins decelerating when the near-point dog ON is detected.
The machine decelerates to the "
3)
On detection of the first zero signal after the axis has traveled the movement amount set in "
movement amount after near-point dog ON" after near-point dog ON, the pulse output from the QD75 stops and the
4)
"deviation counter clear output" is output to the drive unit.
(A "deviation counter clear signal output time" is set in
After a "deviation counter clear output" is output to the drive unit, the OPR complete flag
5)
OFF to ON, and the OPR request flag (
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 servomotor
rotation in the machine OPR stop position.
Machine OPR start
(Positioning start signal)
OPR request flag
[ Md.31 Status : b3]
OPR complete flag
[ Md.31 Status : b4]
Deviation counter clear output
Md.26 Axis operation status
Md.34 Movement amount
after near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
The following shows an operation outline of the "count method 1)" OPR method.
In the "count method 1)" machine OPR, the following can be performed:
Machine OPR on near-point dog ON
Second machine OPR after completion of first machine OPR
Operation chart
Pr.44
OPR direction". It then moves at the "
Pr.47
Pr. 46 OPR speed
V
Near-point dog OFF
Zero signal
ON
OFF
ON
OFF
OFF
Standing by In OPR
0
Inconsistent
Inconsistent
Value the machine moved is stored
Fig. 8.12 Count method1) machine OPR
OPR acceleration time selection", in the direction
Pr.51
Pr.46
Creep speed", and subsequently moves at that speed.
.)
Pr.55
Md.31
Status: b3) turns from ON to OFF.
Pr. 50 Setting for the movement amount
Pr. 47 Creep speed
Md.34 Movement amount after near-point dog ON
ON
One servomotor rotation
ON
Pr.55 Deviation counter clear
Standing by
Value of
OP address
8 - 16
OPR speed" when the acceleration is
Pr.50
Md.31
after near-point dog ON
t
Leave sufficient distance from the zero point
position to the near-point dog OFF
First zero signal after travel of the movement
amount set to " Pr. 50 Setting for the movement
amount after near-point dog ON"
signal output time
1.
MELSEC-Q
Setting for the
Status: b4) turns from
1
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Troubleshooting
