Mitsubishi Electric AJ65BT-D75P2-S3 User Manual page 463

12 CONTROL AUXILIARY FUNCTIONS
1) When the direction from the workpiece to the zero point is the same as the " Pr.46 Zero point
return direction", a normal machine zero point return is carried out.
2) When the direction from the workpiece to the zero point is the opposite direction from the
" Pr.46 Zero point return direction", the operation carries out a deceleration stop when the near-
point dog turns OFF, and then carries out a machine zero point return in the direction set in
" Pr.46 Zero point return direction".
Lower limit
Note) The above figures 1) and 2) are examples where " Pr.46 OPR direction" is set to "0: Positive direction".
When "0: Positive direction" is set in Pr.46 , check that the limit switch placed in the OPR direction acts
as the upper limit. When "1: Negative direction" is set in Pr.46 , check that the limit switch placed in
the OPR direction acts as the lower limit. Incorrect wiring of these limit switches may cause improper
OPR retry operation. If any malfunction is identified, check and correct " Pr.6 Rotation direction
setting" and the wiring."
(b) Zero point return retry operation when the workpiece is outside the range
between the upper and lower limits.
Machine zero point return start
Pr. 46 Zero point return direction
Lower limit
Pr. 46 Zero point return direction
Near-point dog
Fig. 12.2 Zero point return retry operation from on limit (limit signal OFF)
Near-point dog
Zero point signal
Movement range
Zero point signal
Movement range
12 - 5
MELSEC-A
Zero point
Upper limit
Machine zero point return start
Zero point
Upper limit