Zeroing By The Proximity Dog Method - Mitsubishi Electric SV13/22 Programming Manual

7. POSITIONING CONTROL
7.21.2

Zeroing by the proximity dog method

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(1) Proximity dog method
Using the proximity dog method, the home position is the first zero point after
the proximity dog turns OFF.
(2) Zeroing by the proximity dog method
The zeroing operation using the proximity dog method is shown in Fig. 7.33.
Zeroing start
V
Fig. 7.33 Operation of Zeroing by the Proximity Dog Method
(3) Running zeroing
To run zeroing, use the servo program described in Section 7.21.5.
(4) Cautions
Take note of the following points during zeroing by the proximity dog method.
(a) Keep the proximity dog ON during deceleration from the zeroing speed to
the creep speed.
A deceleration stop occurs if the proximity dog turns OFF before
deceleration to the creep speed, and the next zero point becomes the home
position.
Zeroing speed
Proximity dog
The next zero point becomes the home position.
A zero point missed during the deceleration stop after
the next zero point dog turns OFF.
search engine
Zeroing direction
Zeroing speed
Creep speed
Near-zero
point dog
ON OFF
Set creep speed
OFF
ON
7 − 139
*A deceleration stop occurs after
the proximity dog turns OFF.
Positioning carried out from this
position to the zero point.
The distance to the zero point is
determined from the servo data.
t
Zero point
The travel value in this range is stored
in the monitoring register: Travel value
after near-zero point dog turns ON.
The travel value in this range is stored
in the monitoring register: Home
position return second travel value.
The zero point in this range does not
becomes the home position
Zero point