Mitsubishi Electric RD77MS16, User Manual

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8 CONTROL SUB FUNCTIONS
8.2 Sub Functions Specifically for Machine Home Position Return
■ Home position return retry operation when the workpiece is outside the range between the
upper and lower limits.
• When the direction from the workpiece to the home position is the same as the "[Pr.44] Home position return direction", a
normal machine home position return is carried out. The example shown below is for when "0: Positive direction" is set in
"[Pr.44] Home position return direction".
• When the direction from the workpiece to the home position is the opposite direction from the "[Pr.44] Home position return
direction", the operation carries out a deceleration stop when the near-point dog turns OFF, and then carries out a machine
home position return in the direction set in "[Pr.44] Home position return direction". The example shown below is for when
"0: Positive direction" is set in "[Pr.44] Home position return direction".
• When the "0: Positive direction" is selected in "[Pr.44] Home position return direction", the upper limit switch
is set to the limit switch in the home position return direction.
• When the "1: Negative direction" is selected in "[Pr.44] Home position return direction", the lower limit switch
is set to the limit switch in the home position return 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 home position return operation, review "Rotation direction
selection/travel direction selection (PA14)" and the wiring for the upper/lower limit switch.
[Pr.44] Home position return direction
Near-point dog
Hardware lower limit switch Hardware upper limit switch
Zero signal
Movement range
Machine home position return start
Home position
Near-point dog
Hardware lower limit switch Hardware upper limit switch
Zero signal
Movement range
Machine home position return start
Home position
[Pr.44] Home position
return direction