
B–63172EN/01
17. AXES CONTROL
NC FUNCTION
99
Normally, the machine is controlled to move to a commanded position.
However, when the follow up function is applied, actual position in the
CNC is revised according to the move of the machine.
Follow up function is activated when:
– Emergency stop is on
Because machine movement during the emergency stop is reported, the
actual position of the machine is reflected in the CNC. Therefore,
machining can be resumed after the emergency stop has been deactivated,
without performing the reference point return again.
However, when a trouble has generated in the position detection system,
the system cannot follow up correctly. So present position in CNC does
not become correct value.
By input signal (follow up signal) from PMC follow up function can also
be applied to:
– Servo off
status. It is also valid in cases when the machine is moved with a
mechanical handle.
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.
Servo on/off control per axis is possible by input signals from PMC. This
function is generally used with the machine clamp.
The MDI–commanded or the program–commanded move direction of
each axis can be reversed and executed.
Mirror image is set by CRT/MDI setting or by input signals from PMC.
Mirror image can be applied to each axis.
17.1
FOLLOW UP
FUNCTION
17.2
MECHANICAL
HANDLE FEED
17.3
SERVO OFF
17.4
MIRROR IMAGE