Mitsubishi Electric D75D4, User Manual

Page: 529 / 896

12 - 5
MELSEC-Q
12 CONTROL SUB FUNCTIONS
(2) OPR retry operation when the workpiece is outside the range between the
upper/lower limits.
(a) When the direction from the workpiece to the OP is the same as the " Pr.44 OPR direction", a
normal machine OPR is carried out.
(b) When the direction from the workpiece to the OP is the opposite direction from the
" Pr.44 OPR direction", the operation carries out a deceleration stop when the near-point dog
turns OFF, and then carries out a machine OPR in the direction set in " Pr.44 OPR direction".
Note) The above figures in (a) and (b) 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 OPR retry operation from on limit (limit switch OFF)
Pr. 44 OPR direction
Upper limit
Lower limit
Movement range
Machine OPR start
OP
Zero signal
Near-point dog
Pr. 44 OPR direction
Near-point dog
Upper limit
Lower limit
Movement range
Machine OPR start
OP
Zero signal