
B-63943EN-1/02 1.AXIS CONTROL
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1.6 FEED AXIS SYNCHRONIZATION CONTROL
Overview
When a movement is made along one axis by using two servo motors
as in the case of a large gantry machine, a command for one axis can
drive the two motors by synchronizing one motor with the other.
Moreover, by using a feedback signal from each motor, a positional
difference (synchronization error) between the two motors is detected
to compensate for the synchronization error. When a
synchronization error exceeding a set value occurs, a synchronization
error check can be made to issue an alarm and stop a movement along
the axis.
An axis used as the reference for feed axis synchronization control is
referred to as a master axis (M-axis), and an axis along which a
movement is made in synchronism with the master axis is referred to
as a slave axis (S-axis).
Z
(Slave axis)
(Master axis)
Fig. 1.6 (a) Example of machine with X and A being synchronous axes
Even when synchronization error compensation is not used, the
synchronization establishment function can be used for automatic
compensation to eliminate a machine coordinate error in cases such as
emergency stop cancellation.
An external signal can be used to turn synchronization on and off.
When synchronization is turned on and off using an external signal,
synchronization error compensation cannot be used.