12 - 6
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
(c) Zero point return retry operation performed when the zero point is not
passed in the near-point dog method
1) The machine starts moving in the "
Pr.46 Zero point return direction" by a machine zero point
returns start.
2) The machine decelerates to the "
Pr.49 Creep speed" when the near-point dog turns ON.
3) The machine decelerates to a stop when the near-point dog turns OFF.
4) The machine further moves in the "
Pr.46 Zero point return direction" at the " Pr.48 Zero point
return speed".
5) The machine stops when the upper/lower limit signal turns OFF.
1)
3)
4)
5)2)
Near-point dog
ON
Zero point
Limit signal OFF
1 motor revolution
6) The machine moves at the " Pr.48 Zero point return speed" in the direction opposite to the
"
Pr.46 Zero point return direction".
7) The machine stops when the near-point dog turns OFF.
8) A machine zero point return is carried out again. (Zero point return retry operation)
8)
6)
Near-point dog
ON
Zero point
Limit signal OFF
7)
Fig. 12. 3 Zero point return retry operation performed when the zero point is not passed in the near-
point dog method
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