Mitsubishi Electric MELSEC-Q Series - Home Position Return by the Count Method 1; Home Position Return by the Count Method 2

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6 POSITIONING CONTROL
6.23.4 Home position return by the count method 1
(1) Count method 1
After the proximity dog ON, the zero point after the specified distance (travel
value after proximity dog ON) is home position in this method. When the zero
point is not passed (zero pass signal: M2406+20n OFF) until it travels the
distance set in the "travel value after proximity dog ON" from home position
return start, an error will occur and home position return is not executed.
However, when "1 : Not need to pass motor Z phase after the power supply is
switched on" is selected in the "function selection C-4 (PC17)" of servo
parameter (expansion setting parameter), if the zero point is not passed until it
travels the distance set in the "travel value after proximity dog ON" from home
position return start, the home position return can be executed.
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 1
Operation of home position return by count method 1 for passing the zero point
during travel of specified distance set in the "travel value after proximity dog ON"
from the home position return start is shown below.
t
V
ON
Creep speed
Home position
return start
Home position return
direction
Home position
return speed
Proximity dog
Zero point
(Note) : After the proximity dog ON, positioning of the
"travel value after the proximity dog ON" of
the home position return data and the
positioning from the position to zero point.
"Travel value after
proximity dog ON"
of the home
position return data
The travel value in this range is stored in the monitor
register "travel value after proximity dog ON".
The travel value in this range is stored in the monitor
register "home position return re-travel value".
The distance to the zero point is
based on the servo data
Fig. 6.35 Home position return operation by the count method 1
(3) Home position return execution
Home position return by the count method 1 is executed using the servo program
in Section 6.23.19.