Mitsubishi A1SD75P1-S3, User Manual

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MELSEC-A
8 ZERO POINT RETURN CONTROL
Restrictions
When this method is used, a deviation will occur in the stop position (zero point)
compared to other zero point return methods because an error of about 1 ms
occurs in taking in the near-point dog ON.
Precautions during operation
(1) If “ Pr.52 Setting for the movement amount after near-point dog ON” is
smaller than the deceleration distance traveled from “ Pr.48 Zero point return
speed” to “ Pr.49 Creep speed,” an error “count method movement amount
fault” (error code: 206) occurs to cause a failure to start.
(2) The following shows the operation when a machine zero point return is started
while the near-point dog is ON.
Pr.52 Setting for the movement amount after
near-point dog ON
ON
1) 5)
4)
3)
2)
Near-point dog OFF
[Operation when a machine zero point return
is started at the near-point dog ON position]
1) A machine zero point return is started.
2) The machine moves at the zero point return
speed in the opposite direction of the
designated zero point return.
3) Deceleration processing is carried out by
"
Pr.40
Stop group 3 sudden stop selection"
when the near-point dog OFF is detected.
4) After the machine stops, a machine zero
point return is carried out in the designated
zero point return direction.
5) The machine zero point return is completed
after moving the movement amount set in the
"
Pr.52
Setting for the movement amount after
near-point dog ON".
Fig. 8.14 Count method 2) machine zero point return on the near-point dog ON position
(3) If the restart command is turned ON after machine zero point return is stopped
upon a stop signal, an error “zero point return restart not possible” (error code:
209) occurs.
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