Mitsubishi Electric MELSERVO-J4 Instruction Manual page 197

5. HOW TO USE THE PROGRAM
(1) Home position return type
Select the optimum home position return type according to the machine type or others.
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
Dog type last Z-phase
reference
Dog type front end reference
Dogless Z-phase reference
Note. The servo amplifier internally recognizes the Z-phase signal one time per servo motor revolution. The Z-phase signal cannot be
used as an output signal.
Home position return method
Deceleration starts at the front end of a
proximity dog. After the rear end is passed,
the position specified by the first Z-phase
signal or the position of the first Z-phase
signal shifted by the specified home position
shift distance is used as the home position.
(Note)
Deceleration starts at the front end of a
proximity dog. After the rear end is passed,
the position is shifted by the travel distance.
Then, the position specified by the first Z-
phase signal or the position of the Z-phase
signal shifted by the specified home position
shift distance is used as the home position.
The position shifted by any distance
manually is used as the home position.
A workpiece is pressed against a
mechanical stopper, and the position where
it is stopped is used as the home position.
The position at servo-on is used as the
home position.
Deceleration starts at the front end of a
proximity dog. After the rear end is passed,
the position is shifted by the travel distance
after proximity dog and the home position
shift distance. The position after the shifts is
used as the home position.
Deceleration starts at the front end of a
proximity dog. The position is shifted by the
travel distance after proximity dog and the
home position shift distance. The position
after the shifts is used as the home position.
After the front end of a proximity dog is
detected, the position specified by the first
Z-phase signal is used as the home
position.
After the front end of a proximity dog is
detected, the position is shifted away from
the proximity dog in the reverse direction.
Then, the position specified by the first Z-
phase signal or the position of the first Z-
phase signal shifted by the home position
shift distance is used as the home position.
Starting from the front end of a proximity
dog, the position is shifted by the travel
distance after proximity dog and the home
position shift distance. The position after the
shifts is used as the home position.
The position specified by the first Z-phase
signal, or the position of the first Z-phase
signal shifted by the home position shift
distance is used as the home position.
General home position return method using a
proximity dog
The repeatability of the home position return is good.
The machine is less loaded.
Used when the width of the proximity dog can be set
equal to or greater than the deceleration distance of
the servo motor.
Home position return method using a proximity dog
Used to minimize the length of the proximity dog.
No proximity dog is required.
Since the workpiece collides with the mechanical
stopper, the home position return speed must be low
enough.
The strength of the machine and stopper must be
increased.
The Z-phase signal is not required.
The Z-phase signal is not required.
The Z-phase signal is not required.
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