Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 484

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.
When two or more reference marks exist during the full stroke of the linear encoder, select "Enabled (_ _ 1 _)" of "Linear scale
multipoint Z-phase input function selection" in [Pr. PC17].
Linear servo motor
speed
0 mm/s
ON
Proximity dog
OFF
signal
Reference home
position
Linear servo motor
position
*1 This can be changed with [Pr. PL01].
*2 Home position shift distance can be changed with [Pr. PT07] and [Pr. PT69].
■When the linear encoder home position does not exist in the home position return direction
• To execute a home position return securely, start a home position return after moving the linear servo motor
to the opposite stroke end with JOG operation from the controller and others.
• Change the value of the third digit in [Pr. PL01] according to the linear encoder resolution.
When 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. If an error occurs, change the
home position return type, or move the linear servo motor to the stroke end on the opposite side of the home position return
direction with the JOG operation or others from the controller.
Linear servo
motor speed
0 mm/s
Proximity dog ON
signal
OFF
Linear servo motor
position
14 USING A LINEAR SERVO MOTOR
482
14.3 Operation and functions
Home position return direction
Home position return speed
Creep speed
1048576 pulses
1048576 pulses × n + Home position shift distance
Linear encoder home position
Home position return speed
JOG operation
Stroke end Linear encoder home position
Home position returnable area
Home position shift distance
*1
*2
Home position
Home position return direction
Creep speed
Home position non-returnable area
Home position