Count Method2 - Mitsubishi Electric MELSEC iQ-FX5 User Manual

Count method2

The following shows an operation outline of the home position return method "count method 2".
The "count method 2" method is effective when a "zero signal" cannot be received. (Note that compared to the "count method
1" method, using this method will result in more deviation in the stop position during machine home position return.)
Operation chart
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 command from the Simple Motion module will stop and the machine home position return will be completed when
the machine moves the movement amount set in "[Pr.50] Setting for the movement amount after proximity dog ON" from
the proximity dog ON position.
Restrictions
When this method is used, a deviation will occur in the stop position (home position) compared to other home position return
methods because an error of about 1 ms occurs in taking in the proximity dog ON.
2 HOME POSITION RETURN CONTROL
38
2.2 Machine Home Position Return
V
[Pr.46] Home position
return speed
Proximity dog
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
[Md.34] Movement amount after proximity dog ON
ON
OFF
ON
Standby
Value of *1
Home position address
Leave sufficient distance from
the home position to the proximity
dog OFF.
*1