Special Features Of Handwheel Override In Automatic Mode - Siemens SINUMERIK 840D sl Function Manual

If the velocity parameter (F_value) is transferred with a value of 0, the activated handwheel
override acts as a path default (i.e., in this case the feedrate is not derived from axial
machine data
MD32060 $MA_POS_AX_VELO (initial setting for positioning-axis velocity).
References:
● Function Manual, Extended Functions; Positioning Axes (P2)
● Function Manual, Basic Functions, Basic PLC Program (P3)
4.5.3

Special features of handwheel override in automatic mode

Velocity display
The velocity display for handwheel override shows the following values:
● Set velocity
● Actual velocity
Effect on transverse axes
If the axis is defined as a transverse axis and DIAMON is active, the handwheel pulses are
interpreted and traversed as diameter values while handwheel override is active.
Dry-run feedrate
With active dry run
DB21, ... DBX0.6 (activate dry-run feedrate) = 1,
the dry-run feedrate is always effective
SD42100 $SC_DRY_RUN_FEED.
In this way, the axis is traversed to the programmed target position at dry-run feedrate
without any influence from the handwheel despite the active handwheel override with path
default (FDA[AXi] = 0), i.e., the path default is ineffective.
DRF active
When "Handwheel override in automatic mode" is activated, it is important to check whether
the "DRF" function is active (DB21, ... DBX0.3 = 1).
If this were the case, the handwheel pulses would also cause a DRF offset of the axis. The
user must, therefore, first deactivate DRF.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
= programmed velocity
= resultant velocity including handwheel override
H1: Manual travel and handwheel travel
4.5 Handwheel override in automatic mode
311