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8 ZERO POINT RETURN CONTROL
Restrictions
As the import of near-point dog ON has an error of about 1ms, this zero point
return method will vary in stop position (zero point) as compared to the other
methods.
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) At near-point dog OFF detection,
deceleration process is performed according
to the setting of "
Pr.40
Stop group 3 sudden
stop selection".
4) After the machine stops, a machine zero
point return is carried out in the designated
zero point return direction.
5) At near-point dog ON detection, the machine
moves the movement amount set in "
Pr.52
Setting for the movement amount after near-
point dog ON", and the machine zero point
return is completed.
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.