NCT Group NCT 990T - Manual (Page 96)

11 Intervention in the Course of Program Execution
96
11.3 Intervention by Means of Manual Handle in Automatic Operation
The manual handle operation can
also be turned on parallel to the
automatic operation. In this case
in the leftmost field of status bar
caption AUTM or AUTD
indicating automatic operation
can be seen, depending on where
the program execution takes
place from. At the same time in
the 2
nd field of status bar caption
HNDL appears, indicating the
manual handle operation.
By the use of the manual handle
a movement can be overlapped
to the movement of axes defined
in the program. The tool path
formed will differ from the one defined in the program.
The rules of operation are as follows:
– The rules of selecting axis and increment correspond to the ones discussed by manual handle
mode.
– The speed of intervention coming from the manual handle is added algebraically to the speed
resulting from interpolation, however the speed realized cannot be over the maximum
feedrate permitted, that is registered on the given axis.
If e.g. the maximum feedrate is 2000 mm/min and the selected axis is moved in
direction + by 400 mm/min, the speed coming from manual handle can be 1600
mm/min in direction +, or 2400 mm/min in direction –.
If the speed realized is over the maximum speed permitted, the control throws away the
useless pulses, in contrast to the normal manual handle mode.
– Movement is made even in feedrate override state 0%.
– As the effect of intervention by means of manual handle the direction can be reversed.
– Movement is not made in the following cases:
State G00, or other states of rapid traverse movement, as, e.g., positioning phase of
canned cycle, G28, G53, etc. even if no movement command is programmed on the
given axis.
STOP state.