Haas Automation VF Series, Control Book

Page: 56 / 127

49
January 2004
O
VERRIDE
B
UTTONS
D
ETAILS
The feedrate can be varied from 10% to 200% of the programmed value while in operation. This is done with the
fe10%, -10% and 100% buttons. The FEEDRATE override is ineffective during G74 and G84 tapping
cycles. FEEDRATE override does not change the speed of any auxiliary axes. During manual jogging, the
feedrate override will adjust the rates selected from the keypad. This allows for fine control of the jog speed.
The spindle speed can also be varied, from 10% to 150%, using the SPINDLE overrides as above. It is also
ineffective for G74 and G84. In the SINGLE BLOCK mode, the spindle may be stopped. It will automatically
start up upon continuing the program.
By pressing the HANDLE CONTROL FEEDRATE key, the jog handle can be used to control feedrate from 0%
to 999% in ±1% increments. By pressing the HANDLE CONTROL SPINDLE key, the jog handle can be used
to control spindle speed in ±1% increments (from 0% to 999%).
Rapid moves (G00) may be limited to 5%, 25%, or 50% of maximum using the keypad. If the 100% rapid is
too fast, it may be set to 50% of maximum by Setting 10.
In the Settings page, it is possible to disable the override keys so that the operator cannot select them. These
are Settings 19, 20 and 21.
The FEED HOLD button acts as an override button as it sets the rapid and feed rates to zero when it is
pressed. The CYCLE START button must be pressed to proceed after a FEED HOLD. When in a FEED HOLD,
the bottom left of the screen will indicate this. The door switch on the enclosure also has a similar result but
will display “Door Hold” when the door is opened. When the door is closed, machine operation will continue
normally. Door Hold can be prevented with Setting 51. Door Hold and FEED HOLD do not stop any auxiliary
axes.
When Parameter 57 flag DOOR STOP SP is set to 1, the door switch will stop the servos and the spindle. In
addition, the maximum spindle speed is 750 rpm with the doors open.
There is also an override function for the coolant supply. This is done from the Setting 32. The NORMAL setting
checks the low coolant alarm and turns the pump on and off with M-codes. The OFF setting ignores the
coolant alarm, but will alarm if an attempt is made to turn the coolant on. The IGNORE setting is used to ignore
all coolant commands and the low coolant alarm.
At any time a program is running, the operator may override the coolant setting by pressing the MDI Coolant
button. The pump will remain either on or off until the next M-code or operator action.
Overrides can be reset through to defaults upon processing M30 and/or RESET. This feature is selected by
Setting 83.