Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 400

13. POSITIONING MODE
13.6 Home position return mode
13.6.1 Outline of home position return
Home position return is performed to match the command coordinates with the machine coordinates. Be sure
to execute home position return at power-on.
This servo amplifier has the home position return methods given in this section. Choose the most appropriate
method for your machine structure and application.
This servo amplifier has the home position return automatic return function which executes home position
return by making an automatic return to a proper position if the machine has stopped beyond or on the
proximity dog. Manual motion by JOG operation or the like is not required.
(1) Home position return types
Choose the optimum home position return according to the machine type, etc.
Type
Dog type
Count type
Data set type
Stopper type
Home position ignorance
(Servo-on position as
home position)
Dog type rear end
reference
Count type front end
reference
Dog cradle type
Note. The Z-phase signal is a signal recognized in the servo amplifier once per servo motor revolution. It cannot be used as an output
signal.
Home position return method
With deceleration started at the front end of a
proximity dog, the position where the first Z-
phase signal is given past the rear end of the
dog or a motion has been made over the home
position shift distance starting from the Z-
phase signal is defined as a home position.
(Note)
With deceleration started at the front end of a
proximity dog, the position where the first Z-
phase signal is given after advancement over
the preset moving distance after the proximity
dog or a motion has been made over the home
position shift distance starting from the Z-
phase signal is defined as a home position.
An arbitrary position is defined as a home
position.
The position where the machine stops when its
part is pressed against a machine stopper is
defined as a home position.
The position where servo is switched on is
defined as a home position.
The position where the axis, which had started
decelerating at the front end of a proximity dog,
has moved the after-proximity dog moving
distance and home position shift distance after
it passed the rear end is defined as a home
position.
The position where the axis, which had started
decelerating at the front end of a proximity dog,
has moved the after-proximity dog moving
distance and home position shift distance is
defined as a home position.
The position where the first Z-phase signal is
issued after detection of the proximity dog front
end is defined as a home position.
General home position return method using a
proximity dog.
Repeatability of home position return is excellent.
The machine is less burdened.
Used when the width of the proximity dog can be set
greater than the deceleration distance of the servo
motor.
Home position return method using a proximity dog.
Used when it is desired to minimize the length of the
proximity dog.
No proximity dog required.
Since the machine part collides with the machine be
fully lowered.
The machine and stopper strength must be
increased.
The Z-phase signal is not needed.
The Z-phase signal is not needed.
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