Outline Of Home Position Return - Mitsubishi MR-JE-200A Instruction Manual

4. HOW TO USE THE POINT TABLE

4.4.1 Outline of home position return

A home position return is performed to match the command coordinates with the machine coordinates. The
home position return is required every time the input power is on.
This section shows the home position return methods of the servo amplifier. Select the optimum method
according to the configuration and uses of the machine.
This servo amplifier has the home position return automatic retract function. When the machine stops
beyond or on a proximity dog, this function automatically moves the machine back to the proper position to
perform the home position return. Manual operation with JOG operation, etc. is unnecessary.
(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 from the front end of the proximity
dog. A position of the first Z-phase signal after the rear
end is passed or a position moved by the home position
shift amount from the Z-phase signal is set as the home
position.
Deceleration starts from the front end of the proximity
dog. 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 set 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.
Servo-on position is set as the home position.
Deceleration starts from the front end of the 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
set as the home position.
Deceleration starts from the front end of the proximity
dog. A position moved by the moving amount after the
proximity dog and the home position shift amount is set
as the home position.
After the front end of the proximity dog is detected, the
position specified by the first Z-phase signal is used as
the home position.
After the front end of the 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 the 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.
4 - 47
Feature
Typical home position return method
using a proximity dog
The repeatability of the home position
return is high.
The machine is less loaded.
Use this when the width of the proximity
dog can be set equal to or greater than
the deceleration distance of the servo
motor.
This is a home position return method
using a proximity dog.
Use this 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.