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5. OPERATIONAL FUNCTIONS
5.5 Home position return
5.5.1 Summary
The home position return enables the establishment of a start position (home position) in positioning control.
By performing a home position return, instructed coordinates and machine coordinates will be consistent.
When the incremental system method is used, a home position return is required for each power supply. On
the other hand, when the absolute positioning detection system is used, performing a home position return
restores the current command position even after power supply is turned off. This makes a home position
return unnecessary after power is supplied again. Refer to Section 6.21 concerning absolute position detection
systems.
The following table shows the methods of home position return. Select the optimum method according to the
configuration and application of the machine with the home position return option 1 (parameter No.0240). For
any home position return method, when a home position return is completed, the current command position is
a position set in the home position coordinates (parameter No.0246, 0247).
Method Description
Dog method A method that uses the first Z-phase after the proximity dog rear end as the home position.
Data set method A method that uses a current position as the home position. No proximity dog or Z-phase is
necessary.
Stopper method A method that uses the position of the collision stop caused by JOG operation or something
similar as the home position. No proximity dog or Z-phase is necessary.
Dog cradle method A method that uses the first Z-phase after the proximity dog front end as the home position.
Limit switch combined method A method that uses the Z-phase prior to the limit switch of the opposite direction to the home
position return direction as the home position.
Limit switch front end method A method that uses the limit switch front end of the opposite direction to the home position return
direction as the home position. No proximity dog or Z-phase is necessary.
Dog front end method A method that uses the proximity dog front end as the home position. No Z-phase is necessary.
Z-phase detection method A method that uses the nearest Z-phase as the home position. No proximity dog is necessary.
Scale home position signal detection
method
A method that uses the linear scale home position signal as the home position.
Scale home position signal detection
method 2
A method that uses the nearest linear scale home position signal as the home position for home
return direction. No proximity dog is necessary.