NCT Group NCT 990T - Manual (Page 90)

9 Override Switches
90
switch
state
%
1 F0
2 25
3 50
4 100
switch
state
%
1 50
2 60
3 70
4 80
5 90
6 100
7 110
8 120
9 130
10 140
9.2 Rapid Traverse Override Switch
The rapid traverse override switch determines, by how many percent of
the rapid traverse rate defined in the parameter should the axes be
moved. The diagram beside contains the switch positions and the
percentages belonging to the positions.
F0 is a percentage fixed at parameter 1204 RAPOVER. Its practical
value is 10% or less.
If the value of parameter 1204 RAPOVER is 0 the rapid traverse
override values (depending on the PLC program) are the same discussed
earlier at feedrate override in the range of 0, 1, 2, 5, 10, 20, ..., 100%.
Consult with the machine tool builder on details.
Feedrate override switch position 0% stops the rapid traverse movements as well, so there is
no need to have a rapid traverse position 0%.
In basic configuration, rapid traverse rate override switch can be selected on OPERATOR’S
PANEL or POSITION screens. After pressing the action menu key, action
F4
% must be
selected. This way with the help of softkeys R–, R+ the percentage can be decreased (by means
of softkey R–), as well as increased (by means of softkey R+).
If the machine is mounted with NCT machine control board the
rapid traverse override value can be selected with four buttons
optionally.
L Note:
The control can also take over % value of rapid traverse rate from feedrate override switch.
For details turn to the machine tool builder for an information material.
9.3 Spindle Speed Override Switch
The spindle speed override switch has 11 positions. The switch deter-
mines, by how many percent of the programmed spindle revolution (S)
should the spindle be rotated. The diagram beside contains the switch
positions and the percentages belonging to the positions.
In basic configuration, spindle speed override switch can be selected on
OPERATOR’S PANEL or POSITION screens. After pressing the
action menu key, action
F4 % must be selected. This way with the help
of softkeys S–, S+ the percentage can be decreased (by means of
softkey S–), as well as increased (by means of softkey S+).
Three buttons are mounted on the NCT machine control board. In this
case in place of the above mentioned override adjustment with softkeys
the three buttons can be used. With the button in effect the value
is decreased, while by pressing the button it is increased. By