16.20 HOME POSITION RETURN MODE
Before performing the home position return, make sure that the limit switch
operates.
Check the home position return direction. An incorrect setting will cause a
reverse running.
Check the input polarity of the external limit. Otherwise, it may cause an
unexpected operation.
16.20.1 Outline of home position return
A home position return is performed to match the command coordinates with the machine coordinates.
Under the incremental method, each power-on of the input power supply requires the home position return.
Contrastingly, in the absolute position detection system, once you have performed the home position return
at machine installation, the current position will be retained even if the power supply is shut off. Therefore,
the home position return is unnecessary when the power supply is switched on again.
This section shows the home position return methods of the driver. Select the optimum method according to
the configuration and uses of the machine.
(1) Home position return types
Select the optimum home position return type according to the machine type or others.
Home position return method
Torque limit changing dog
type
Deceleration starts at the external
limit detection. The position specified
by the first Z-phase signal, or the
position of the first Z-phase signal
shifted by the home position shift
distance is used as the home
position.
This is a typical home position return method
using an external limit.
The repeatability of the home position return is
high.
The machine is less loaded.
Used when the width of the external limit can be
set equal to or greater than the deceleration
distance of the servo motor.
Torque limit changing data
set type
An arbitrary position is used as
the home position.
An external limit is not required.
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