2 HOME POSITION RETURN CONTROL
2.2 Machine Home Position Return
37
2
Count method1
The following shows an operation outline of the home position return method "count method 1".
In the "count method 1", the machine home position return can be performed in the following cases:
• Where the near-point dog is on
• After the machine home position return is completed
Operation chart
1. The machine home position return is started.
(The machine begins the acceleration designated in "[Pr.51] Home position return acceleration time selection", in the direction
designated in "[Pr.44] Home position return direction". It then moves at the "[Pr.46] Home position return speed" when the
acceleration is completed.)
2. The machine begins decelerating when the near-point dog ON is detected.
3. The machine decelerates to the "[Pr.47] Creep speed", and subsequently moves at that speed.
4. The machine stops after the workpiece has been moved the amount set in the "[Pr.50] Setting for the movement amount
after near-point dog ON" after the near-point dog turned ON. It then restarts and stops at the first zero point.
5. The home position return complete flag ([Md.31] Status: b4) turns from OFF to ON, and the home position return request
flag ([Md.31] Status: b3) turns from ON to OFF.
First zero signal after moving a set to
"[Pr.50] Setting for the movement
amount after near-point dog ON.
Home position return complete flag
([Md.31] Status: b4)
Home position return request flag
([Md.31] Status: b3)
[Md.34] Movement amount after near-point dog ON
*1
t
Machine home position return start
(Positioning start signal)
ON
OFF
ON
OFF
OFF
ON
Standby
Home position return Standby
Inconsistent
0
Inconsistent
Value of the machine moved is stored
Home position address
V
Zero signal
Value of *1
Near-point dog
ON
OFF
Leave sufficient distance from
the home position to the near-point dog OFF.
One servo motor rotation
Adjust the setting for the movement amount
after near-point dog ON to be as near as possible
to the center of the zero signal HIGH.
If the setting for the movement amount after
near-point dog ON falls within the zero signal,
there may be produced an error of one servo motor
rotation in the home position return stop position.
[POINT]
A
After the home position return
has been started, the zero point
of the encoder must be passed at
least once before point A is reached.
[Pr.46] Home position
return speed
[Pr.50] Setting for the movement amount after near-point dog ON
[Pr.47] Creep speed
[Md.26] Axis operation status
[Md.34] Movement amount
after near-point dog ON
[Md.20] Current feed value
[Md.21] Machine feed value
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