Mitsubishi A1SD75M3 User Manual page 139

5 DATA USED FOR POSITIONING CONTROL
6 : Data setting method
(1) Start machine zero point return.
(The axis does not operate.)
(2) Register the current position to the servo amplifier as the
zero point.
(Store " Pr.47 Zero point address" into the current feed
value and machine feed value.)
7 : Near-point dog method 2)
(1) Start machine zero point return.
(Start movement at the " Pr.48 Zero point return speed" in
the " Pr.46 Zero point return direction".)
(2) Detect the near-point dog ON, and start deceleration.
(3) Decelerate to " Pr.49 Creep speed", and move with the
creep speed.
Decelerate to a stop at the near-point dog OFF.
(4) Move to the first zero point (single-pulse output per motor
revolution) after the near-point dog OFF, and complete the
machine zero point return.
Note) If the zero point is not detected between a machine
zero point return start and deceleration to a stop by
the near-point dog OFF, deceleration to a stop occurs
at the near-point dog OFF, the motor rotates one turn
in the direction opposite to the designated zero point
return direction, and then the machine zero point
return operation is performed again.
When the zero point is detected, the operation as in
the near-point dog method is performed.
8 : Count method 3)
(1) Start machine zero point return.
(Start movement at the " Pr.48 Zero point return speed" in
the " Pr.46 Zero point return direction".)
(2) Detect the near-point dog ON, and start deceleration.
(3) Decelerate to " Pr.49 Creep speed", and move with the
creep speed.
Stop in the position where the movement amount set in
" Pr.52 Setting for the movement amount after near-point
dog ON" is reached after the near-point dog turned ON.
(4) Move to the first zero point (single-pulse output per motor
revolution), and complete the machine zero point return.
Note) If the zero point is not detected from when the
machine zero point return has started until the
movement amount set in " Pr.52 Setting for the
movement amount after near-point dog ON" is
reached, deceleration to a stop occurs at the near-
point dog OFF, the motor rotates one turn in the
direction opposite to the designated zero point return
direction, and then the machine zero point return
operation is performed again.
When the zero point is detected, the operation as in
the count method 1) is performed.
Machine zero
point return start
Pr.48 Zero point return speed
V
(1)
Near point dog
Zero point
Pr.48 Zero point return speed
V
(1)
Near-point dog
Zero point
5 - 49
MELSEC-A
V
Position where
machine zero point
return is executed
is registered as
zero point
(2)
(1)
(2)
Pr.49 Creep speed
(4)
(3)
ON
OFF
Pr.52 Setting for the movement
(2)
amount after near-point dog ON
Pr.49 Creep speed
(3)
(4)
t
Near-point dog must turn OFF
ON
at sufficient distance away from
OFF
the zero point position
First zero point after the
movement amount after
near-point dog ON is reached
t
t