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

DB31, ... DBX62.1 (handwheel override active)
If the velocity parameter (F_Value) is transferred with the value 0, then the activated handwheel
override acts as distance input, i.e. in this case, the feed is not derived from the axial machine
data (see also Chapter "P2: Positioning axes (Page 653)"):
MD32060 $MA_POS_AX_VELO (initial setting for positioning axis velocity)
References:
Function Manual, Basic Functions, Basic PLC Program (P3)
4.13.1.3

Special features of handwheel override in automatic mode

Velocity display
The velocity display for handwheel override shows the following values:
● Set velocity
= programmed velocity
● Actual velocity
= resultant velocity including handwheel override
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.
Feedrate override
The feedrate override does not affect the velocity of the movements produced by the
handwheel (exception: 0%). It only affects the programmed feedrate.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
H1: Manual and handwheel travel
4.13 Use of handwheels in automatic mode
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