
B–63173EN–1/01
2. PREPARATIONS FOR OPERATION
103
NOTE
The overtravel amount of the motor after turning *IT or
*RILK to “0” is represented by the following formula.
Where
Q
max
: Overtravel quantity (mm or inch)
F
m
: Feedrate (mm/min or inch/min)
T
c
: Cutting time constant (ms)
T
s
: Servo time constant (Ts = 33ms normally)
A : Processing time of CNC
Standard interlock signal *IT : A=40ms
High–spped interlock signal *RILK : A=12ms
Q
max
=F
m
1
60
× (
T
c
1000
+
T
s
1000
+
A
1000
)
[Classification] Input signal
[Function] These signals disable feed along axes on an axis–by–axis basis.
A separate interlock signal is provided for each controlled axis. The
number at the end of each signal name denotes the number of the
corresponding controlled axis.
*IT 1
1 ..... Interlock for the first axis
2 ..... Interlock for the second axis
3
..... Interlock for the third axis
::
::
[Operation] a) In manual operation
The movement of an interlocked axis is inhibited, but the other axes
are movable. If an axis is interlocked during movement, it stops after
being decelerated, and it starts moving again when it is released from
interlock.
b) In automatic operation (AUTO RMT or MDI mode)
If an axis is interlocked while its movement is being commanded (the
move amount is not 0, inclusive of the tool offset), all axes movements
are prevented.
If a moving axis is interlocked, all axes stop moving after being
decelerated, and they start moving again when it is released from being
interlocked.
This function is effective during dry run.
Interlock signal for each
axis
*IT1 to *IT8<G130>