Mitsubishi A1SD75P1-S3, User Manual

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12 - 5
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
(b) Zero point return retry operation when the workpiece is outside the range
between the upper and lower limits.
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.
Pr. 46 Zero point return direction
Upper limit
Lower limit
Movement range
Machine zero point return start
Zero point
Zero point signal
Near-point dog
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".
Pr. 46 Zero point return direction
Near-point dog
Movement range
Machine zero point return start
Zero point
Zero point signal
Upper limit
Lower limit
Note) The above figures 1) and 2) are examples where "
Pr.44
OPR direction" is set to "0: Positive
direction". When "0: Positive direction" is set in
Pr.44
, check that the limit switch placed in the
OPR direction acts as the upper limit. When "1: Negative direction" is set in
Pr.44
, 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.
Fig. 12.2 Zero point return retry operation from on limit (limit signal OFF)
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