NCT Group NCT 990T - Manual (Page 112)

13.5 Automatic Mode Restart with BLOCK RETURN Condition
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13.5 Automatic Mode Restart with BLOCK RETURN Condition
If automatic operation has been interrupted, manual operation was used to move away from
the workpiece and return is to be made to the interruption point, the BLOCK RETURN
condition needs to be used.
Its switch can be selected on the OPERATOR’S PANEL or POSITION screens. After
pressing the action menu key action
F5 CONDITIONS must be selected and the BLOCK RE-
TURN softkey pressed.
If NCT machine control board is used select the button.
The control calculates the return position by taking the possible changes of work zero point
offset values and tool offset values into account. In the general displaying area indicating the
distance to go position the difference between the return position and momentary position
appears.
Afterwards the return can be made by means of manual operation or automatically in automatic
mode.
13.5.1 Return to the Interruption Point by Means of Manual Operation
In the interrupted (INTD) state of automatic operation the BLOCK RETURN condition
can be switched on in any manual operation mode (Jog, Incremental jog, Manual handle feed).
When the condition is on the distance needed for return, is shown on the distance to go display
for each axis. The axes can be moved continuously in any (+/–) direction to the position,
where the distance to go is 0. The axis moved decelerates and stops automatically on the
return position. Afterwards the axis cannot be moved any more from this position, only if the
BLOCK RETURN condition is switched off.
There is no need to move fully to the return position, but by switching over to automatic mode
and pressing the START the return process can be continued. With the help of this
function return to start position can be made in the desired way, thereby avoiding the possible
obstacles.
13.5.2 Return to the Interruption Point in Automatic Operation
In automatic mode in case the BLOCK RETURN condition is on by the use of the
START button it returns to the start position of the block by linear interpolation. If an
obstacle is in the way of return, the movement can be interrupted with the help of the STOP
button. Afterwards the return can also be continued by means of a manual mode.