
B-65270EN/05 4.SERVO FUNCTION DETAILS
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4.17 SYNCHRONOUS AXES AUTOMATIC COMPENSATION
(1) Overview
With synchronized axes having a long stroke, a machine twist may
occur due to the absolute precision of the scale and thermal expansion
of the machine. In such a case, the master motor and slave motor of
the synchronized axes pull each other, and if a large current flows for
the pull, an overheat problem or OVC alarm is raised.
The fundamental cause of this is a measurement position error. Pitch
error compensation can compensate for the scale error but cannot
compensate for thermal expansion due to change in temperature.
The synchronous axes automatic compensation function is useful for
such cases. The function monitors a torque error between the master
and slave and corrects the position on the slave side slowly to reduce
the torque error.
(Structure of the synchronous axes automatic compensation function)
Position error
Position error
Velocity
control
Velocity
control
Master axis
Slave axis
Low-pass
filter
Limit
Separate
detecto
Separate
detecto
(2) Series and editions of applicable servo software
(Series 15i-B,16i-B,18i-B,21i-B,0i-B,0i Mate-B,Power Mate i)
Series 90B1/A(01) and subsequent editions
Series 90B6/A(01) and subsequent editions
(Series 0i-C,0i Mate-C,20i-B)
Series 90B5/A(01) and subsequent editions