Mitsubishi MR-JE-100A, Инструкция по эксплуатации

Страница: 122 / 396

4. HOW TO USE THE POINT TABLE
4 - 49
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.
Item Device/parameter to be used Setting
Home position return mode
selection
MD0 (Operation mode selection 1) Switch on MD0.
DI0 (Point table No. selection 1) to
DI4 (Point table No. selection 5)
Switch off DI0 to DI4.
Dog type home position
return
[Pr. PT04] _ _ _ 0: Select the dog type.
Home position return
direction
[Pr. PT04]
Refer to section 4.4.1 (2) to select the home
position return direction.
Dog input polarity [Pr. PT29]
Refer to section 4.4.1 (2) to select the
proximity dog input polarity.
Home position return speed [Pr. PT05]
Set the rotation speed specified until a dog is
detected.
Creep speed [Pr. PT06]
Set the rotation speed specified after a dog is
detected.
Home position shift distance [Pr. PT07]
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.
Acceleration time
constant/Deceleration time
constant
Point table No. 1
The acceleration/deceleration time constant
of point table No. 1 is used.
Home position return position
data
[Pr. PT08]
Set the current position at the home position
return completion.
(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).
L
1
≥
V
60
•
td
2
··············································································································· (4.1)
L
1
: Length of the proximity dog
V: Home position return speed [mm/min]
td: Deceleration time [s]
L
2
≥ 2 • ∆ S ··················································································································· (4.2)
L
2
: Length of the proximity dog
∆ S: Travel distance per servo motor revolution [mm]