Count Method1 - Mitsubishi Electric MELSEC iQ-FX5 User Manual

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 proximity dog is on
• After the machine home position return is completed
Operation chart
[POINT]
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.
Machine home
position return start
(Positioning start signal)
Home position return
request flag
([Md.31] Status: b3)
Home position return
complete flag
([Md.31] Status: b4)
[Md.26] Axis operation status
[Md.34] Movement amount
after proximity
dog ON
[Md.20] Feed current value
[Md.21] Machine feed value
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 proximity 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 proximity dog ON" after the proximity 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.
2 HOME POSITION RETURN CONTROL
36
2.2 Machine Home Position Return
V
[Pr.46] Home position
return speed
Proximity dog
OFF
Zero signal
ON
OFF
ON
OFF
OFF
Standby Home position return
Inconsistent 0
Inconsistent Value of the machine moved is stored
[Pr.50] Setting for the movement amount after proximity dog ON
[Pr.47] Creep speed
t
A
[Md.34] Movement amount after proximity dog ON
Leave sufficient distance from
the home position to the proximity dog OFF.
ON
Adjust the setting for the movement amount
after proximity dog ON to be as near as possible
to the center of the zero signal HIGH.
If the setting for the movement amount after
proximity 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.
First zero signal after moving a set to
"[Pr.50] Setting for the movement
amount after proximity dog ON".
One servo motor rotation
ON
Standby
Value of *1
Home position address
*1