Percentage Feedrate Override (Ovr, Ovra) - Siemens SINUMERIK 840DE Programming Manual

Feedrate FPR[...]
As an extension of the G95 command (revolutional feedrate referring to the master spindle),
FPR allows the revolutional feedrate to be derived from any chosen spindle or rotary axis.
G95 FPR(...) is valid for path and synchronized axes.
If the rotary axis/spindle specified in the FPR command is operating on position control, then
the setpoint linkage is active. Otherwise the actual-value linkage is effective.
Feedrate FPRAON(...,...), FPRAOF(...,...)
The FPRAON command makes it possible to derive the revolutional feedrate for specific
positioning axes and spindles from the current feedrate of another rotary axis or spindle.
The first command identifies the axis/spindle that must be traversed at a revolutional
feedrate. The second command identifies the rotary axis/spindle that is to supply the
feedrate. The command need not be specified a second time. If it is not, the feedrate is
derived from the master spindle.
The revolutional feedrate can be deactivated for one or several axes/spindles simultaneously
with the FPRAOF command. The feedrate is calculated in the same way as for FPR(...).
Examples: The revolutional feedrate for master spindle 1 must be derived from spindle 2.
N30 FPRAON(S1,S2)
N40 SPOS=150
N50 FPRAOF(S1)
The revolutional feedrate for positioning axis X must be derived from the master spindle. The
positioning axis is traversing at 500 mm/revolution of the master spindle.
N30 FPRAON(X)
N40 POS[X]=50 FA[X]=500
N50 FPRAOF(S1)
7.8

Percentage feedrate override (OVR, OVRA)

Function
You can use the programmable feedrate override to change the velocity/speed 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...]=...
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Feedrate Control and Spindle Motion
7.8 Percentage feedrate override (OVR, OVRA)
7-25