Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual page 401

• Home position return is executed in the proximity dog, it travels to reverse direction of home position return. If home
position signal (zero point) is detected, a deceleration stop is made, it travels to direction of home position return again with
the creep speed and the detecting position of home position signal (zero point) is home position.
Home position
V
return direction
Creep speed
(3)
Home
position
(2)
Proximity
dog
• If the zero point is passed during deceleration, the nearest position of home position signal (zero point) of home position
return direction from deceleration stop position is set as the home position.
Home position Home position
V
return direction return speed
Creep speed
(4)
Home
Home position position
return start
(3)
Proximity
dog
• Home position return retry function cannot be used in the scale home position signal detection method.
• An error always occurs without the proximity dog in home position return direction from home position return starting
position. Make the proximity dog overlap in limit switch as shown in the figure above so that the proximity dog is set before
limit switch of home position return direction. And, when home position return is executed in the proximity dog, an error will
occur if zero point is not in reverse direction of home position return from home position return starting position.
• When there is only one zero point in the motor like linear motor, home position return may not be ended if zero point is in
the proximity dog. Set zero point before the proximity dog.
• If the "[St.1062] In-position (R: M32402+32n/Q: M2402+20n)" is not turned ON, home position return is not ended.
(1) It travels to preset reverse direction of home position
return with the home position return speed.
Home position
(2)
Home position signal (zero point) is detected, and a
return start
deceleration stop is made.
After a deceleration stop, it travels to preset
(3)
direction of home position return with the creep
speed, and the home position return ends with
the position of home position signal (zero point).
(1)
External limit switch
Zero point
(1) It travels to preset direction of home position return
with the home position return speed, and a
deceleration stop is made by the proximity dog ON.
After a deceleration stop, it travels to reverse direction of
(2)
(1)
home position return with the home position return speed.
Home position signal (zero point) is detected, and a
(3)
deceleration stop is made. (The home position signal
(zero point) is passed during deceleration.)
After a deceleration stop, it travels to preset direction of
(4)
home position return with the creep speed, the home
position return ends with the nearest position of home
position signal (zero point).
(2)
External limit switch
Zero point
5 POSITIONING CONTROL
5.21 Home Position Return
5
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