Siemens SINUMERIK 840D Function Manual

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Substitute characteristic curve with curved path sectionsIn the case of curved path sections, normal and tangential acceleration are consideredtogether. The path velocity is reduced so that only up to 25 % of the speed-dependentacceleration capacity of the axes is required for normal acceleration. The remaining 75 % of theacceleration capacity is set aside for the tangential acceleration, i.e., deceleration/accelerationon the path.YtUD1 DDPD[DHUVDUHGYUHG YHUV YPD[ Y① Normal range② Reducing rangeaN Normal accelerationaers: Substitute characteristic curve constant accelerationvers Substitute characteristic curve velocityr Path radiusFigure 12-7 Substitute path characteristic curve: Curved pathBlock transitions with continuous-path modeIf continuous-path mode is active, non-tangential block transitions result in axial velocity jumpswhen the programmed path velocity is used for traversing.As a result, the path velocity is controlled in such a way that prevents any axial velocityproportion from exceeding the creep velocity vred at the time of the block transition.Deceleration ramp with continuous-path mode and LookAheadIn the case of consecutive traversing blocks with short paths, an acceleration or decelerationoperation may be spread over several part program blocks.In such a situation the "LookAhead" function also takes into account the parameterized speed-dependent acceleration characteristic.B2: Acceleration and jerk12.2 FunctionsAxes and spindles382 Function Manual, 06/2019, A5E47437747B AA