Mitsubishi A1SD75M3

8 - 16
MELSEC-A
8 ZERO POINT RETURN CONTROL
8.2.7 Zero point return method (5): Count method 3)
When the zero point is passed from a machine zero point return start until the machine
moves the movement amount set to "
Pr.52
Setting for the movement amount after
near-point dog ON", the operation outline of the zero point return method "count
method 3)" is the same as that of the zero point return method (1) "count method 1)".
(Refer to section 8.2.5.)
The following shows the operation outline of the case where the zero point is not
passed from a machine zero point return start until the machine moves the movement
amount set to "
Pr.52
Setting for the movement amount after near-point dog ON".
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 decelerates to "
Pr.49
Creep speed", and then moves at the creep
speed.
3)
The machine decelerates to a stop in the position where the movement amount set to "
Pr.52
Setting for the movement
amount after near-point dog ON" is reached.
4)
After stopping, the machine moves by the amount of one servomotor revolution at "
Pr.48
Zero point return speed" in the
direction opposite to the designated zero point return direction.
5)
The machine moves at "
Pr.48
Zero point return speed" in the designated zero point return direction, and completes the
machine zero point return in the position of the first zero point following the movement of the movement amount set to
"
Pr.52
Setting for the movement amount after near-point dog ON" after near-point dog ON.
(At this time, the machine does not decelerate to "
Pr.49
Creep speed" when the near-point dog turns from OFF to ON.)
Zero point return
direction
Zero point
return speed
Creep speed
Speed
Near-point dog
ON
OFF
Pr.48
Pr.49
Zero point
1)
2)
3)
4)
5)
Zero point not passed
Setting for the movement amount
after near-point dog ON
Pr.52
Turn OFF the near-point dog
sufficiently away from the
zero point position.
Fig. 8.10 Operation performed when the zero point is not passed in the count method 3)