Siemens SINUMERIK 840D sl Function Manual page 1750

Detailed description
2.3 Feedrate control
Axis/spindle disable" DB31, ... DBX1.3
Activating "Axis/spindle disable" (DB 31, ...DBX1.3) disables the axial PLC interlocks "No
controller enable" and "Feed stop".
The axial and channelspecific override, however, is active.
"Spindle stop" DB31, ... DBX4.3
IS "Spindle stop" (DB31, ... DBX4.3) is used to stop the relevant spindle.
Activation of the "Spindle stop" function
If G33, G34, G35 active:
If G63 active:
If G331, G332 active:
2.3.3 Feedrate override on machine control panel
General
The operator can use the feedrate override switch to increase or decrease the path feedrate
relative to the programmed percentage with immediate effect. The feedrates are multiplied
by the override values.
An override between 0 and 200% can be programmed for the path feedrate.
The rapid traverse override switch is used to reduce the traversing velocity when testing a
part program.
An override between 0 and 100% can be programmed for the rapid traverse.
The feedrate can be changed axisspecifically for positioning axes. The override can be
between 0 and 200%.
The spindle override can be used to modify the spindle speed and the cutting rate (with G96,
G961). The override can be between 0 and 200%.
The override is not permitted to exceed the machinespecific acceleration and speed limits or
generate a contour error.
The feedrate override can be changed separately for path and positioning axes.
The overrides act on the programmed values or on the limits (e.g., G26, LIMS for spindle
speed).
A sequence of G63 blocks is traversed without taking into account the feedrate override. A
sequence of G63 blocks consists of directly consecutive blocks with G code G63. It starts
with the first G63 block and finishes with the first path motion block, which is not a G63 block.
34
Effective
(may cause contour deviations depending on
dynamic characteristics)
Effective
Not effective
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0