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6 POSITIONING CONTROL
6.23 Home Position Return
(1) Use the home position return at the power supply ON and other times where
decision of axis is at the machine home position is required.
(2) The home position return data must be set for each axis to execute the home
position return.
(3) The home position return methods that are available are proximity dog method,
count method, data set method, dog cradle method, stopper method, limit switch
combined method, scale home position signal detection method, dogless home
position signal reference method, and driver home position return method. Select
the optimal home position return method for the system configuration and
applications with reference to the following.
Home position return
methods
Reference
position
External signal Applications
Proximity
dog
method
Proximity
dog
method 1
Motor zero
point
DOG
(FLS/RLS)
• It is used in the system which can surely pass a zero point from the
home position return start to proximity dog ON
OFF.
• When the proximity dog is ON, it cannot be started.
Proximity
dog
method 2
• This method is valid when the stroke range is short and "proximity dog
method 1" cannot be used.
• When the proximity dog is ON, it cannot be started.
Count
method
Count
method 1
• It is used in the system which can surely pass a zero point from the
home position return start to point of travel distance set as "travel value
after proximity dog ON".
Count
method 2
Command
position
• This method is used when the proximity dog is near the stroke end and
the stroke range is narrow.
Count
method 3
Motor zero
point
• This method is valid when the stroke range is short and "count method
1" cannot be used.
Data set
method
Data set
method 1
Command
position
—
• It is used in a system where external input signals such as dog signal
are not set in the absolute position system.
• This method is valid for the data set independent of a deviation counter
value.
Data set
method 2
Motor actual
position
• It is used in a system where external input signals such as dog signal
are not set in the absolute position system.
Dog cradle method
Motor zero
point
DOG
(FLS/RLS)
• Home position is zero point of servo motor immediately after the
proximity dog signal ON.
• It is easy to set the position of proximity dog, because the proximity dog
is set near the position made to the home position.
Stopper
method
Stopper
method 1
Motor actual
position
DOG
• This method is valid to improve home position accuracy in order to
make the home position for the position which stopped the machine by
the stopper.
Stopper
method 2
—
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