Dog Type Home Position Return - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

4. HOW TO USE THE POINT TABLE

4.4.2 Dog type home position return

This home position return type uses a proximity dog. Deceleration starts at the proximity dog front end. After
the rear end is passed, the position specified by the first Z-phase signal, or the position of the first Z-phase
signal shifted by the specified home position shift distance is used as the home position.
(1) Device/parameter
Set input devices and parameters as follows.
Item
Home position return mode
selection
Dog type home position
return
Home position return
direction
Dog input polarity
Home position return speed
Creep speed
Home position shift distance
Home position return
acceleration/deceleration time
constant
Home position return position
data
(2) Proximity dog length
To generate the Z-phase signal of the servo motor during the DOG (Proximity dog) detection, the
proximity dog length should satisfy formulas (4.1) and (4.2).
V td
≥
L • ················································································································ (4.1)
1 60 2
L : Proximity dog length [mm]
1
V: Home position return speed [mm/min]
td: Deceleration time [s]
≥ 2 • ∆S ··················································································································· (4.2)
L
2
L : Proximity dog length [mm]
2
∆S: Travel distance per servo motor revolution [mm] (Note)
Note. For linear servo motor: travel distance per stop interval selection at the home position return of [Pr. PL01]
Used device/parameter
MD0 (Operation mode selection 1)
DI0 (Point table No. selection 1) to
DI7 (Point table No. selection 8)
[Pr. PT04]
[Pr. PT04]
[Pr. PT29]
[Pr. PT05]
[Pr. PT06]
[Pr. PT07]
Point table No. 1
[Pr. PT08]
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Setting
Switch on MD0.
Switch off DI0 to DI7.
_ _ _ 0: Select the dog type.
Refer to section 4.4.1 (2) to select the home
position return direction.
Refer to section 4.4.1 (2) to select the
proximity dog input polarity.
Set the rotation speed until the dog is
detected.
Set the rotation speed after the dog is
detected.
Set this item to shift the home position
specified by the first Z-phase signal after
passage of proximity dog rear end.
Use the acceleration/deceleration time
constant of point table No. 1.
Set the current position at the home position
return completion.