Mitsubishi Electric MR-J4W2-0303B6, Instruction Manual

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16. FULLY CLOSED LOOP SYSTEM
16 - 16
If the home position return is performed from the position where the linear encoder home position
(reference mark) does not exist, a home position return error occurs on the controller side. The
error contents differ according to the controller type. When starting a home position return at the
position where the linear encoder home position (reference mark) does not exist in the home
position return direction, move the axis up to the stroke end on the side opposite to the home
position return direction by JOG operation, etc. of the controller once, then make a home position
return.
Stroke end Home position
Home position return speed
Creep speed
Home position return direction
ON
OFF
Proximity dog
signal
Machine position
Linear encoder home position
JOG operation
Home position returnable area Home position non-returnable area
Servo motor
speed
0 r/min
(c) 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.
Servo amplifier
power-on position
Home position
ON
OFF Load-side encoder
Z-phase signal
Reference home position
Machine position
Equivalent to one servo motor revolution
(b) About data setting type (Common to all load-side encoders)
In the data setting type home position return method, pass through a home position (reference mark)
and the Z-phase signal of the rotary encoder, and then make a home position return.
When the machine has no distance of one servo motor encoder revolution until the Z-phase of the
rotary encoder is passed through, a home position return can be made by changing the home
position setting condition selection in [Pr. PC17] if the home position is not yet passed through.