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16. FULLY CLOSED LOOP SYSTEM
(b) About proximity dog type home position return using incremental linear encoder
1) When the linear encoder home position (reference mark) exists in the home position return
direction
When an incremental linear encoder is used, the home position is the position per servo motor
revolution to the linear encoder home position (reference mark) passed through first after a home
position return start.
In the case of a dog type home position return, after the proximity dog signal rear end is detected,
the nearest home position reference position shifted by the home position shift distance is used
as the home position.
Set one linear encoder home position in the full stroke, and set it in the proximity dog signal
detection position.
Servo motor
speed
Proximity dog
signal
Reference home
position
Machine position
Note. Home position shift distance can be changed with [Pr. PT07] and [Pr. PT69].
2) When the linear encoder home position does not exist in the home position return direction
If the home position return is performed from the position where the linear encoder home position
does not exist in the home position return direction, an error may occur depending on the home
position return type. In this case, change the home position return type, or move the mover to the
stroke end on the opposite side of the home position return direction with the JOG operation from
the controller and others, and then perform a home position return.
Servo motor
speed
Proximity dog
signal
Machine position
Home position return speed
0 r/min
ON
OFF
Linear encoder home position
0 r/min
ON
OFF
Stroke end
Home position returnable area
16 - 13
Home position return direction
Creep speed
Equivalent to one servo motor revolution
Equivalent to servo motor "n" times rotation +
Home position shift distance (Note)
Home position return direction
Home position return speed
JOG operation
Linear encoder home position
Home position non-returnable area
Home position shift distance
Home position
Creep speed
Home position
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