Mitsubishi A1SD75M3 User Manual page 478

12 CONTROL AUXILIARY FUNCTIONS
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.
Zero point
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)
Zero point
Fig. 12. 3 Zero point return retry operation performed when the zero point is not passed in the near-
point dog method
(c) Zero point return retry operation performed when the zero point is not
passed in the near-point dog method
2)
1)
ON
Near-point dog
1 motor revolution
8)
7)
ON
Near-point dog
3)
4)
12 - 6
MELSEC-A
5)
Limit signal OFF
6)
Limit signal OFF