Siemens SINUMERIK 840D sl Function Manual

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4.3.2 Velocity reduction according to overload factorFunctionThe function lowers the path velocity in continuou-path mode until the non-tangential blocktransition can be traversed in one interpolation cycle while respecting the deceleration limitand taking an overload factor into account.With the reduced velocity, axial jumps in velocity are produced with a non-tangential contourat the block transition. These jumps in velocity are also performed by the coupled motionsynchronized axes. The jump in velocity prevents the path velocity dropping to zero. This jumpis performed if the axial velocity was reduced with the axial acceleration to a velocity fromwhich the new setpoint can be reached with the jump. The magnitude of the setpoint jump canbe limited using an overload factor. Because the magnitude of the jump is axial, the minimumjump of the path axes which are active during the block change is considered during blocktransition.WWW%ORFNFKDQJH%ORFNFKDQJH;D[LV3DWKYHORFLW\9HORFLW\RIWKH;D[LV /HDGD[/HDGI[ D[/HDGI\ D\/HDGD\D[LDOYHORFLW\MXPS,32F\FOHI\!I[!I[!9HORFLW\RIWKH$[LDOYHORFLW\MXPS,32F\FOHI2YHUORDGIDFWRUFigure 4-3 Axial velocity change on block transitionWith a practically tangential block transition, the path velocity is not reduced if the permissibleaxial accelerations are not exceeded. This means that very small bends in the contour (e.g.0.5°) are overtraveled directly.B1: Continuous-path mode, Exact stop, Look Ahead4.3 Continuous-path modeBasic Functions186 Function Manual, 01/2015, 6FC5397-0BP40-5BA2