Home Position Return - Mitsubishi Electric MELSERVO-J4 series Instruction Manual

16. FULLY CLOSED LOOP SYSTEM

16.3.2 Home position return

(1) General instruction
Home position return is all performed according to the load-side encoder feedback data, independently
of the load-side encoder type. It is irrelevant to the Z-phase position of the servo motor encoder. In the
case of a home position return using a dog signal, the scale home position (reference mark) must be
passed through when an incremental type linear encoder is used, or the Z-phase be passed through
when a rotary encoder is used, during a period from a home position return start until the dog signal
turns off.
(2) Load-side encoder types and home position return methods
(a) About proximity dog type home position return using absolute type linear encoder
When an absolute type linear encoder is used, the home position reference position is the position
per servo motor revolution to the linear encoder home position (absolute position data = 0).
In the case of a proximity dog type home position return, the nearest position after proximity dog off
is the home position.
The linear encoder home position may be set in any position.
Servo motor
speed
0 r/min
Proximity dog ON
signal
OFF
Reference home
position
Equivalent to one servo motor revolution
Machine position
Linear encoder home position
16 - 16
Home position return direction
Home position return speed
Creep speed
Home position