NCT Group NCT 990T - Manual (Page 66)

6.1 Manual Reference Point Return Mode
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6 Manual Operation Modes
The manual operation modes are as follows:
Manual reference point return
Manual handle feed
Incremental jog
Jog
6.1 Manual Reference Point Return Mode
Reference point can be returned only upon power-on state of the machine, i.e. when there is no
EMG (emergency stop) state in the rightmost field (general NC state) of status bar. If one of
the axes has not been returned to the reference point, in case of that axis no absolute position-
ing (G90) can be programmed. The parametric overtravel also functions only after the
reference point return. The reference point return mode is indicated by caption REF in the 2
nd
field of the status bar.
If the machine is mounted with NCT machine control board the reference point return mode
can be switched on by pressing the button.
Axis Selection
After selecting the operation mode by pressing and holding down the
appropriate axis’s button returning to the reference point on the
selected axis is beginning. If the axis direction button is not held down
any longer the movement stops, if it is pressed again the process is
continued. More axes’ jog buttons can be pressed at a time, therefore
return to reference point can be made simultaneously on several axes.
On the
selected axis the direction of
movement depends on the
parameter and independent of
whether key of direction + or
key of direction
! is being
pressed. Generally on the control
panels +X,
!X, +Z, !Z are
equipped. This way the move-
ment on axes X, Z can be
directly started.
If the ABSOLUTE POSITION
screen is used during reference
point return, on the axes, on
which return to reference point
has already occurred, symbol %is
displayed beside the position, while on the ones, on which no return to reference point