Programmable Feedrate Override - Siemens SINUMERIK 828D Function Manual

Override inactive
An override factor of 100% is internally effective if an override is not activated. The override factor at the NC/PLC
interface is not evaluated.
An exception is the zero setting for a binary interface and the 1st switch setting for a gray­coded interface. In
these cases, the override factors entered at the NC/PLC interface are evaluated. For a binary interface, the
override factor is always 0%. For a gray-coded interface, the value entered in machine data for the 1st switch
position value is output as override value. It should be populated with 0.
Reference to spindle override
The spindle override can refer to the speed or the programmed speed limited by the machine or setting data. The
setting is realized via:
MD12080 $MN_OVR_REFERENCE_IS_PROG_FEED (override reference velocity)
17.4.4

Programmable feedrate override

Function
The programmable feedrate override can be used to change the velocity level of path and positioning axes by
means of a command in the part program.
A separate feedrate override can be programmed for positioning axes.
Programming
The feedrate override can be changed with the following commands:
OVR= ....
OVRA[X1]= ...
The programmable range is between 0 and 200%.
The default setting is 100%.
Effectivity
Interface signals "Rapid traverse and feedrate override" (DB21, ... DBB6) and "Axis-specific override active"
(DB31, ... DBX1.7) do not apply to the programmable feedrate override. The programmable feedrate override
remains active when these signals are deactivated.
The active override is calculated from the product of the programmable feedrate override and the feedrate
override from the machine control panel.
The default setting is 100%. It is active if no feedrate override has been programmed or following a RESET, if
machine data:
MD22410 F_VALUES_ACTIVE_AFTER_RESET (F function active via RESET)
is not set.
OVR is not active with G33,G34,G35.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Feedrate change for path feedrate F
Feedrate change for positioning feedrate FA
V1: Feedrates
17.4 Feedrate control
1395