Mitsubishi Electric MR-J4-100B(-RJ), Instruction Manual

Page: 522 / 706

16. FULLY CLOSED LOOP SYSTEM
16 - 17
(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 proximity dog type home position return, the nearest position after proximity dog
off is the home position.
Set one linear encoder home position in the full stroke, and set it in the position that can always
be passed through after a home position return start.
Servo motor
speed
Linear encoder home position Home position
Home position return speed
Creep speed
Home position return direction
ON
OFF
Proximity dog
signal
Reference home
position
Machine position
Equivalent to one servo motor revolution
0 r/min
2) When the linear encoder home position does not exist in the home position return direction
POINT
To execute a home position return securely, start a home position return after
moving the axis to the opposite stroke end by jog operation, etc. of the
controller.
A home position return cannot be made if the incremental linear encoder does
not have a linear encoder home position (reference mark). Always provide a
linear encoder home position (reference mark). (one place in the fully stroke)