Mitsubishi Electric MELSERVO-J4 Instruction Manual page 133

4. HOW TO USE THE POINT TABLE
(1) Home position return types
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
Home position return method
Deceleration starts at the proximity dog front
end. 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 home position shift distance is
used as the home position.
Deceleration starts at the proximity dog front
end. After the proximity dog is passed, the
motor travels the specified travel distance.
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.
An arbitrary position is used as the home
position.
A workpiece is pressed against a
mechanical stopper, and the position where
it is stopped is set as the home position.
The position where the servo is switched on
is used as the home position.
Deceleration starts at the proximity dog front
end. 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 set
as the home position.
Deceleration starts at the proximity dog front
end. The position is shifted by the travel
distance after proximity dog and the home
position shift distance. The position after the
shifts is set as the home position.
After the proximity dog front end is detected,
the position specified by the first Z-phase
signal is used as the home position.
After the proximity dog front end 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.
From the proximity dog front end, the
position is shifted by the travel distance after
proximity dog and the home position shift
distance. The position after the shifts is set
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.
The home position return speed must be low enough
because of the collision with the mechanical stopper.
The strength of the machine and its 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.
4 - 46
Feature