Opr Method (5): Count Method1) - Mitsubishi Electric QD75P1N User Manual

8 OPR CONTROL

8.2.7 OPR method (5): Count method1)

The machine OPR is started.
(The machine begins the acceleration designated in " Pr.51 OPR acceleration time selection", in the direction
1)
designated in " Pr.44 OPR direction". It then moves at the " Pr.46 OPR speed" when the acceleration is completed.)
2) The machine begins decelerating when the near-point dog ON is detected.
3)
The machine decelerates to the " Pr.47 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 " Pr.50 Setting for the
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 Pr.55 .)
After a "deviation counter clear output" is output to the drive unit, the OPR complete flag Md.31 Status: b4) turns from
5)
OFF to ON, and the OPR request flag ( Md.31 Status: b3) turns from ON to OFF.
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
OPR request flag
Md.31 Status: b3
OPR complete flag
Md.31 Status: b4
Deviation counter clear output
Md.26 Axis operation status
Movement amount
Md.34
after near-point dog ON
Current feed value
Md.20
Machine feed value
Md.21
The following shows an operation outline of the "count method 1)" OPR method.
In the "count method 1)", machine OPR can be performed even in the following
situations:

when near-point dog is ON

after completion of a machine OPR
Operation chart
V
Pr.46
1)
Near-point dog
Zero signal
ON
OFF
ON
OFF
OFF
Standby OPR
0
Inconsistent
Value the machine moved is stored
Inconsistent
Fig. 8.12 Count method1) machine OPR
OPR speed Pr.50 Setting for the movement amount
after near-point dog ON
Creep speed
Pr.47
2) 3) 4) 5)
Movement amount after near-point dog ON
Md.34
ON
Adjust the setting for the movement amount after
near-point dog ON to be as near as possible to
OFF
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.
ON
Pr.55
Standby
Value of *1
OP address
8 - 17
MELSEC-Q
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"
One servomotor rotation
Deviation counter clear
signal output time
*1