Feedrate Control and Spindle Motion
7.6 Percentage feedrate override (OVR, OVRA)
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
293
7.6 Percentage feedrate override (OVR, OVRA)
Function
You can use the programmable feedrate override to change the velocity of path axes,
positioning axes, and spindles via a command in the NC program.
Programming
OVR=…
or
OVRA[axis]=…
or
OVRA[SPI(spindle)]=… or OVRA[S…]=…
Parameter
OVR
Feedrate change in percent for path feedrate F
OVRA
Feedrate change in percent for positioning feedrate FA or for spindle
speed S
SPI
Converts the spindle number into an axis identifier; the transfer
parameter must contain a valid spindle number. The spindle
identifiers SPI(...) and S... are identical in terms of function.
Axis
Positioning axes or geometry axes
Range of values
…200%, integers; with path and rapid traverse override, the
maximum velocities set in the machine data are not overshot.
Example of programmed feed rate change
The programmed feedrate change refers to or is combined with the feedrate override set on
the machine control panel.
Example:
Set feedrate override 80%
Programmed feedrate override OVR=50
The programmed path feedrate F1000 is changed to F400 (1000 * 0.8 * 0.5).
N10 OVR=25 OVRA[A1]=70
;Path feedrate 25%, Positioning feedrate for A1 70%.
N20 OVRA[SPI(1)]=35
;Speed for spindle 1 35%.
or
N20 OVRA[S1]=35
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