Mitsubishi Electronics QD75D, QD75P OPR direction, a, OPR direction is set to 0 Positive

12 CONTROL SUB FUNCTIONS

MELSEC-Q

(2)OPR retry operation when the workpiece is outside the range between the upper and lower limits.

1)When the direction from the workpiece to the OP is the same as the " normal machine OPR is carried out.

Pr.44

OPR direction", a

Machine OPR start		OP
Pr. 44	OPR direction
Lower limit		Upper limit
	Near-point dog
	Zero signal
	Movement range

2) 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".
	Machine OPR start
	OP
Pr. 44 OPR direction
Lower limit	Upper limit
Near-point dog
Zero signal
Movement range
Note) The above figures (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)

12 - 5