
B-63322EN/03 NC FUNCTIONS 20.AXIS CONTROL FUNCTIONS
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20.1 FOLLOW-UP
If the machine moves in the state in which position control on
controlled axes is disabled (during servo-off, emergency stop, or servo
alarm), feedback pulses are accumulated in the error counter. The
CNC reflects the machine movement corresponding to the error count
in the current position managed by the CNC. This operation is referred
to as follow-up. When follow-up is performed, the current position
managed by the CNC does not shift from the actual machine position.
You can select whether to perform follow-up for axes for which the
servo is turned off.
Follow-up is always performed during emergency stop or a servo
alarm.
20.2 MECHANICAL HANDLE FEED
It is possible to move the machine by hand, using the mechanical
handle installed on the machine; not by the NC (servo motor).
Move distance by the mechanical handle is followed up and actual
position in
The NC is revised. The mechanical handle feed is done by inputting
the servo off signal of the axis fed. It is necessary, however, to specify
following up of the movement in the servo off status with the follow up
signal.
20.3 SERVO OFF
Place the controlled axes in the servo off state; that is, they stop the
current to the servo motor, which disables position control. However,
the position detection feature functions continuously, so the current
position is not lost. These signals are used to prevent the servo motors
from overloading when the tools on the axes are mechanically clamped
under certain machining conditions on the machine, or to move the
machine by driving the motors by mechanical handles.
20.4 MIRROR IMAGE
The MDI-commanded or the program-commanded move direction of
each axis can be reversed and executed.
Mirror image is set by MDI setting or by input signals from PMC.
Mirror image can be applied to each axis.