Specifications

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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.
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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.
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