Home Position Return By The Count Method 3 - Mitsubishi Electric MELSEC Q Series Programming Manual

6 POSITIONING CONTROL
6.23.5 Home position return by the count method 2
(1) Count method 2
After the proximity dog ON, the position which traveled the specified distance
(travel value after proximity dog ON) is home position in this method.
It is not related for zero point pass or not pass.
A count method 2 is effective method when a zero point signal cannot be taken.
(However, dispersions will occur to the stop position at the home position return
compared with the count method 1.)
The travel value after proximity dog ON is set in the home position return data
(Refer to Section 6.23.1).
(2) Home position return by the count method 2
Operation of home position return by count method 2 is shown below.
Home position
Home position
V
return direction
return speed
Proximity dog
Home position
return start
Fig. 6.36 Home position return operation by the count method 2
(3) Home position return execution
Home position return by the count method 2 is executed using the servo program
in Section 6.23.19.
(4) Cautions
(a) Home position return and continuously start of home position return are also
possible in the proximity dog ON in the count method 2.
When the home position return and continuously start of home position
return are executed in the proximity dog ON, the home position return is
executed after return the axis once to position of the proximity dog OFF.
(b) When the "travel value after proximity dog ON" is less than the deceleration
distance from "home position return speed" to "creep speed", a minor error
(error code: 209) will occur and deceleration stop is made.
(c) Command position is the home position.
(d) If in-position signal (M2402+20n) does not turn ON, home position return is
not ended.
(Note): After the proximity dog ON, a position
which traveled the distance "travel
value after proximity dog ON" of the
home position return data is home
Creep speed
position.
The travel value in this range is stored in the
monitor register "travel value after proximity dog
ON".
(Note): "Home position return re-travel value" = 0
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