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6. Home Position Return Method
6.1 Position Control Mode (Pulse Input)
When using the home position return in position control mode (pulse input), use the home position return function in
the positioning module of the upper PLC.
Please see product operation manuals for positioning module layouts, parameter configuration, home position
return method etc.
6.2 Positioning mode (point table)
In positioning mode (point table) a home position return function is available. There are 6 types of home position
return as shown below. See
“
LECSA Operation Manual”,section 13.6 for details.
Type
Home position return method
Features
Dog type
With Deceleration started at the detection of front edge of a proximity dog switch signal,
the position where the first Z-phase signal is given past the rear edgeof the dog signal
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)
General home position return
method using a proximity dog.
Good repeat accuracy of home
position return
Decreases product load.
Used when the width of the
proximity dog can be set greater
than the deceleration distance
of the servo motor.
Count type
With Deceleration started at the detection of front edge of a proximity dog switch signal,
the position where the first Z-phase signal is given after advancement over the preset
moving distance after the proximity dog switch signal or a motion has been made over
the home position shift distance starting from the Z-phase signal is defined as a home
position.
Home position return method
using a proximity dog.
Used when it is minimisation of
the proximity dog length is
required.
Data set type
An arbitrary position defined as a home position.
No proximity dog required.
Stopper type
The position where the actuator stops when its slider is pressed against a machine stop
is defined as a home position.
Since the machine part collides
with the machine be fully
lowered.
The machine and stopper
strength must be increased.
Home position
ignorance (Servo-on
position as home
position)
The position where servo is switched on is defined as a home position.
Dog type rear end
reference
The position where the axis, which had started dcceleration of the front edge of a
proximity dog switch signal, has moved the after-proximity dog moving distance and
home position shift distance after it has passed the rear edge of proximity dog switch
signal is defined as a home position.
Z-phase signal not required.
Count type front end
reference
The position where the axis, which had started dcceleration at the front edge of a
proximity dog switch signal, has moved the after-proximity dog moving distance and
home position shift distance is defined as a home position.
Z-phase signal not required.
Dog cradle type
The position where the first Z-phase signal is detected after detection of the proximity
dog front edge signal is defined as a home position.
Note. The Z-phase signal is a signal recognised in the driver once per servo motor revolution. This cannot be used as an output signal.
Set parameter PE03 (Home position return type) for home position return. The parameter recommended in
“
LECSA
Operation Manual (Simplified Edition)”,section 5.3.4 is the stopper type (PE03
：
0003). Please select the home position
return as appropriate to the customer application.
