Siemens SINUMERIK 840D Function Manual page 712

H1: Manual traversing
17.13 Use of handwheels in automatic mode
Activation
The function is activated via interface signal:
DB21, ... DBX30.3 = 1
The feedrate is then no longer specified by the handwheel pulses, but by feedrate F...
programmed in the NC program.
Specifying the direction of rotation
The direction of rotation of the simulated handwheel is specified using the interface signal:
DB21, ... DBX30.4
Override
When the "Simulated contour handwheel" function is active, the override is effective as for NC
program execution.
Stopping traversing motion
If the "Simulated contour handwheel" function is deselected, or the direction of rotation
switched over, then the actual traversing motion is stopped along a braking ramp.
Boundary conditions
● Velocity limiting
– When the "Contour handwheel" function is activated via interface signal (DB21, ...
– When the "Contour handwheel" function is activated using command FD=0 in the NC
● Acceleration and velocity limit values
When traversing the axes using the "Contour handwheel" function, the axis-specific limit
values for acceleration, defined in machine data (e.g. MD32300 $MA_MAX_AX_ACCEL),
and velocity (MD32000 $MA_MAX_AX_VELO) are maintained.
● Interruption of traversing movement
If, while traversing using the "Contour handwheel" function, an NC stop is initiated (DB21, ...
DBX7.3 or 4), then the function remains selected. The handwheel pulses received during an
NC stop are not evaluated. Requirement: MD32084
$MA_HANDWH_CHAN_STOP_COND, bit 2 == 1
● DRF
An active DRF function (DB21, ... DBX0.3) additionally has a path override action.
712
DBX30.0 - 2), the path velocity that can be entered via the handwheel is limited to:
Max. path velocity = (programmed path velocity F...) * (MD12030
$MN_OVR_FACTOR_FEEDRATE[ 30 ] + reserve for dynamic operations)
program, the path velocity that can be entered via the handwheel is limited to the
maximum axis velocities defined in machine data (MD32000 $MA_MAX_AX_VELO).
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA