Dog Type Home Position Return - Mitsubishi MR-JE-200A Instruction Manual

4. HOW TO USE THE POINT TABLE

4.4.2 Dog type home position return

This is a home position return method using a proximity dog. Deceleration starts at the front end of the
proximity dog. 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.
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
Acceleration time
constant/Deceleration time
constant
Home position return position
data
(2) Length of the proximity dog
To generate the Z-phase signal of the servo motor during the detection of DOG (Proximity dog), set the
length of the proximity dog that satisfies equations (4.1) and (4.2).
V td
L ≥ • ··············································································································· (4.1)
1
60 2
L : Length of the proximity dog
1
V: Home position return speed [mm/min]
td: Deceleration time [s]
L ≥ 2 • ∆S ··················································································································· (4.2)
2
L : Length of the proximity dog
2
∆S: Travel distance per servo motor revolution [mm]
Item Device/parameter to be used
MD0 (Operation mode selection 1)
DI0 (Point table No. selection 1) to
DI4 (Point table No. selection 5)
[Pr. PT04]
[Pr. PT04]
[Pr. PT29]
[Pr. PT05]
[Pr. PT06]
[Pr. PT07]
Point table No. 1
[Pr. PT08]
Switch on MD0.
Switch off DI0 to DI4.
_ _ _ 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 specified until a dog is
detected.
Set the rotation speed specified after a dog is
detected.
Set this item to shift the home position, which
is specified by the first Z-phase signal after
the rear end of a proximity dog is passed.
The acceleration/deceleration time constant
of point table No. 1 is used.
Set the current position at the home position
return completion.
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Setting