Yaskawa Yasnac PC NC - Manual (Page 43)

YASNAC PC NC Operating Manual Chapter 2: PC NC System Outline
2 - 22
2.6.2 MDI Operation
Automatic operation is possible by inputting a program in the MDI mode. Follow the procedure
indicated below.
Select the MDI mode with the MODE SELECT switch on the machine operation panel.
Enter the block of commands from the keyboard. For details of program entry operation in
the MDI mode, refer to 6.2, “MDI OPERATION JOB”.
Press the CYCLE START switch on the machine operation panel and the execution of the
entered program is started.
2.6.3 Feed Hold
The feed hold function suspends automatic operation temporarily. Follow the procedure indi-
cated below.
When the FEED HOLD switch on the machine operation panel is pressed while an axis is
moving, it stops after deceleration. The CYCLE START lamp on the machine operation
panel goes OFF and the FEED HOLD lamp lights.
After the completion of axis movement, the indicating lamp goes OFF.
1. If the execution of a drilling canned cycle is stopped halfway due to the single block
function, the FEED HOLD lamp automatically goes ON to indicate that the operation
is suspended during the execution of a drilling canned cycle.
2. The setting of the FEED HOLD switch is disregarded while a tapping cycle is executed
in the G84 mode.
3. If the FEEL HOLD switch is turned ON while M, S, T, or B* function not associated to
be completed although the FEED HOLD lamp lights immediately. After the completion
of the function, the FEED HOLD lamp goes OFF and operation stops.
2.6.4 Override
The following provides a general description of the override function. For details of override,
refer to the machine tool manuals.
(1) Feedrate Override
In the automatic mode (TAPE, MEM, MDI), feedrate specified by an F code can be over-
ridden in 21 steps in the range from 0 to 200% in increments of 10%, using the FEEDRATE
OVERRIDE switch on the machine operation panel. During the execution of a tapping cycle
(G74, G84), the setting is disregarded and the tapping cycle is executed in the feedrate speci-
fied by the program. If the OVERRIDE CANCEL switch is ON, the setting of the FEED
RATE OVERRIDE switch is disregarded and the axis are moved at the feedrate specified by
the F codes in a program.