Mitsubishi A1SD75M3

8 - 11
MELSEC-A
8 ZERO POINT RETURN CONTROL
8.2.5 Zero point return method (3): Count method 1)
The following shows the outline of the zero point return method "count method 1)".
Operation chart
1)
The machine zero point return is started.
(The machine starts acceleration designated in "
Pr.53
Zero point return acceleration time selection" in the direction
designated in "
Pr.46
Zero point return direction", and moves at "
Pr.48
Zero point return speed".)
2) At detection of the near-point dog ON, the machine starts deceleration.
3)
The machine decelerates to "
Pr.49
Creep speed", and then moves at the creep speed.
4)
The machine decelerates to a stop as soon as it moves the movement amount set to "
Pr.52
Setting for the movement
amount after near-point dog ON" after the near-point dog has turned ON. The machine accelerates to "
Pr.49
Creep
speed" again, and stops at the first zero point.
5)
The zero point return complete flag (
Md.40
Status: b4) turns from OFF to ON, and the zero point return request flag
(
Md.40
Status: b3) turns from ON to OFF.
First zero point after movement of the amount
set to " Setting for the movement amount
after near-point dog ON"
t
Machine zero point return start
(Positioning start signal)
ON
OFF
Zero point return
speed
ON
OFF
OFF
ON
V
Zero point
Movement amount after near-point dog ON
Near-point dog
ON
OFF
*1
Setting for the movement amount
after near-point dog ON
Creep speed
Turn OFF the near-point dog sufficiently away
from the zero point position.
Pr.48
Pr.49
Pr.52
Standing by
In zero point return
Standing by
Inconsistent
0
Inconsistent
Value the machine moved is stored Zero point address
Value of *1
Md.30
Machine feed value
Md.29
Current feed value
Md.35
Axis operation status
Zero point return request flag
[ Status: b3]Md.40
One servomotor revolution
Pr.52
1) 2) 3) 4) 5)
Zero point return complete flag
[ Status: b4]Md.40
Movement amount after
near-point dog ON
Md.44
Md.44
Fig. 8.5 Count method 1) machine zero point return