Programmable Feedrate Override; Dry Run Feedrate - Siemens SINUMERIK 840D Function Manual

5.4.3

Programmable feedrate override

Function
The "Programmable feedrate override" function can be used to change the velocity level of path
and positioning axes via the part program.
Programming
Syntax
OVR=<value>
OVRA[<axis>=<value>
The programmable range is between 0 and 200%.
Default setting: 100%
Effectiveness
The NC/PLC interface signals DB21, ... DBB6 (rapid traverse or feedrate override active) and
DB31, ... DBX1.7 (axis-specific override active) do not refer to the programmable feedrate
override. The programmable feedrate override remains active when these signals are
deactivated.
The effective override is calculated from the product of the "Programmable feedrate override"
and the "Feedrate override via machine control panel (Page 159)".
The default setting for the "Programmable feedrate override" is 100%.
The default setting is effective:
● If no feedrate override is programmed or
● After reset if the machine data:
MD22410 $MC_F_VALUES_ACTIVE_AFTER_RESET (F function is active even after reset)
is not set.
Note
OVR is not effective with G33, G34, G35.
5.4.4

Dry run feedrate

Function
The dry run feedrate is used when testing part programs without machining the workpiece in
order to allow the program or program sections to execute with an increased path feedrate, for
example.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Meaning
Feedrate change for path feedrate F
Feedrate change for positioning feedrate FA
V1: Feedrates
5.4 Feedrate control
163