Mitsubishi Electric MELSEC-Q Series User Manual page 609

1) When the direction from the workpiece to the HP is the same as the "[Pr.44] HPR direction", a
normal machine HPR is carried out.
Machine HPR start
Hardware lower limit switch
2) When the direction from the workpiece to the HP is the opposite direction from the "[Pr.44] HPR
direction", the operation carries out a deceleration stop when the proximity dog turns OFF, and
then carries out a machine HPR in the direction set in "[Pr.44] HPR direction".
Pr. 44 HPR direction
Hardware lower limit switch
In the above example 1) and 2), "0: Positive direction" is set in "[Pr.44] HPR direction"
REMARK

When the "0: Positive direction" is selected in "[Pr.44] HPR direction", the upper limit switch is set
to the limit switch in the HPR direction.

When the "1: Negative direction" is selected in "[Pr.44] HPR direction", the lower limit switch is set
to the limit switch in the HPR direction.
 If inverting the install positions of upper/lower limit switches, hardware stroke limit function cannot
be operated properly.
If any problem is found for HPR operation, review "Rotation direction selection/travel direction
selection (PA14)" and the wiring for the upper/lower limit switch.
Fig. 13.2 HPR retry operation from on limit (limit signal OFF)
(2) HPR retry operation when the workpiece is outside the range between the
upper and lower limits.
Pr. 44 HPR direction
Proximity dog
Movement range
Proximity dog
Movement range
Zero signal
Zero signal
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Chapter 13 Control Sub Functions
HP
Hardware upper limit switch
Machine HPR start
HP
Hardware upper limit switch