Manual Home Position Return Mode; Outline Of Home Position Return; Dog Type Home Position Return; Count Type Home Position Return - Mitsubishi Electric MELSERVO-J2 Series Instruction Manual

4. OPERATION

4.4 Manual home position return mode

4.4.1 Outline of home position return

Home position return is performed to match the command coordinates with the machine coordinates. In
the incremental system, home position return is required every time input power is switched on. In the
absolute position detection system, once home position return is done at the time of installation, the
current position is retained if power is switched off. Hence, home position return is not required when
power is switched on again.
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
at the proximity dog. Manual motion by jog operation or the like is not required.
(1) Manual home position return types
Five manual home position return types are available. Choose the optimum home position return
according to the machine type, etc.
Type
Dog type home position
return
Count type home position
return
Data setting type home
position return
Stopper type home
position return
Home position ignorance
(Servo-on position as home
position)
Note: The Z-phase signal is a signal recognized in the servo amplifier once per servo motor revolution and cannot be used as an
output signal.
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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.
The position reached after any automatic motion 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.
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General home position return method using a
proximity dog.
Repeatability of home position return is
excellent and 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.
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