Programmable Feedrate Override (Ovr, Ovrrap, Ovra); Programmable Acceleration Compensation (Acc) - Siemens SINUMERIK 840D sl Programming Manual

The revolutional feedrate can be deactivated for one or a number of axes/spindles
simultaneously with the FPRAOF command.
2.7.6

Programmable feedrate override (OVR, OVRRAP, OVRA)

The velocity of path/positioning axes and speed of spindles can be modified in the NC program.
Syntax
OVR=<value>
OVRRAP=<value>
OVRA[<axis>]=<value>
OVRA[SPI(<n>)]=<value>
OVRA[S<n>]=<value>
Meaning
OVR:
OVRRAP:
OVRA:
<axis>:
SPI(<n>)/S<n>:
<value>:
2.7.7

Programmable acceleration compensation (ACC)

In critical program sections, it may be necessary to limit the acceleration to below the maximum
values, e.g. to prevent mechanical vibrations from occurring.
The programmable acceleration override can be used to modify the acceleration for each path
axis or spindle via a command in the NC program. The limit is effective for all types of
interpolation. The values defined in the machine data apply as 100% acceleration.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Feedrate modification for path feedrate F
Feedrate modification for rapid traverse velocity
Feedrate modification for positioning feedrate FA or for spindle speed S
Axis identifier (positioning or geometry axis)
Spindle identifier
SPI(<n>) and S<n> are identical in terms of function.
Spindle number
<n>:
Note:
SPI converts spindle numbers into axis identifiers. The transfer parame‐
ter (<n>) must contain a valid spindle number.
Feedrate modification in percent
The value refers to or is combined with the feedrate override set on the
machine control panel.
Range of values: 0 ... 200%, integral
Note:
With path and rapid traverse override, the maximum velocities set in the
machine data is not overshot.
Fundamentals
2.7 Feed control
125