Velocity Reduction According To Overload Factor - Siemens SINUMERIK 840D sl Function Manual

B1: Continuous-path mode, Exact stop, Look Ahead
4.3 Continuous-path mode
4.3.2

Velocity reduction according to overload factor

Function
The function lowers the path velocity in continuou-path mode until the non-tangential block
transition can be traversed in one interpolation cycle while respecting the deceleration limit
and taking an overload factor into account.
With the reduced velocity, axial jumps in velocity are produced with a non-tangential contour
at the block transition. These jumps in velocity are also performed by the coupled motion
synchronized axes. The jump in velocity prevents the path velocity dropping to zero. This jump
is performed if the axial velocity was reduced with the axial acceleration to a velocity from
which the new setpoint can be reached with the jump. The magnitude of the setpoint jump can
be limited using an overload factor. Because the magnitude of the jump is axial, the minimum
jump of the path axes which are active during the block change is considered during block
transition.
Figure 4-3
With a practically tangential block transition, the path velocity is not reduced if the permissible
axial accelerations are not exceeded. This means that very small bends in the contour (e.g.
0.5°) are overtraveled directly.
186
Axial velocity change on block transition
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions