Siemens SINUMERIK 840DE

Feedrate Control and Spindle Motion
7.9 Feedrate with handwheel override (FD, FDA)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
7-29
Example: N20 POS[V]=90 FDA[V]=0
The automatic travel movement is stopped in block N20. The operator can now move the
axis manually using the handwheel.
Direction of movement, travel velocity
The axes accurately follow the path set by the handwheel in the direction of the leading sign.
Depending on the direction of rotation, you can travel forwards or backwards – the faster you
turn the handwheel, the higher the travel velocity.
Traversing range
The traversing range is limited by the starting position and the end point programmed with
the positioning command.
Handwheel travel with velocity overlay, FDA[axis]=...
In NC blocks with programmed FDA[...], the feedrate from the last programmed FA value is
accelerated or decelerated to the value programmed under FDA. Starting from the current
feedrate FDA, you can turn the handwheel to accelerate the programmed movement to the
target position or delay it to zero. The values defined in the machine data are used for the
maximum velocity.
Example:
N10 POS[U]=10 FDA[U]=100
POSA[V]=20 FDA[V]=150
Note
With velocity override of path axes, you always control the path velocity with the handwheel
of the 1st geometry axis.
Traversing range
The traversing range is limited by the starting position and the programmed end point.