Operation From Controller - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

• 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 axis to the
opposite stroke end by jog operation, etc. of the controller.
• If the incremental linear encoder does not have a linear encoder home position (reference mark), only the
home position return type without using Z-phase can be performed.
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
0 r/min
ON
Proximity dog
signal
OFF
Machine position
Home position returnable area
■About dog type home position return when using the rotary encoder of a serial
communication servo motor
The home position for when using the rotary encoder of a serial communication servo motor for the load-side encoder is at the
load-side Z-phase position.
Load-side encoder ON
Z-phase signal
OFF
Reference home position
Machine position
Servo amplifier
power-on position

Operation from controller

An absolute type linear encoder is necessary to configure an absolute position detection system under fully closed loop
control using a linear encoder. In this case, the encoder battery need not be installed to the servo amplifier. When a rotary
encoder is used, an absolute position detection system can be configured by installing the encoder battery to the servo
amplifier. In this case, the battery life will be shorter because the power consumption is increased as the power is supplied to
the two encoders of motor side and load side.
Positioning operation from the controller is basically performed like the semi closed loop control.
Home position return direction
Home position return speed
JOG operation
Stroke end Linear encoder home position
Equivalent to one servo motor revolution
Creep speed
Home position
Home position non-returnable area
Home position
16 FULLY CLOSED LOOP SYSTEM
16.3 Operation and functions
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