Siemens SINUMERIK 840D sl Function Manual

Also see for SINUMERIK 828D Turning: Diagnostic manual Function manual Equipment manual Programming manual Operating manual

The determination of the transition condition has an effect firstly on the gear stage change timeand secondly on the accuracy of the approach to the preset gear stage change position.Block changeThe block change is stopped and the machining blocks are not started until the gear stage hasbeen changed by the PLC (DB31, ... DBX16.3).End of gear stage changeOnce the gear stage change has been completed, the spindle returns to open-loop controlmode and will automatically change to the closed-loop control mode defined by SPCON orSPCOF.All gear-specific limit values (min./max. speed of gear stage, etc.) correspond to the check-back values of the actual gear stage.Supplementary conditions● The spindle must have at least one measuring system.● Position-controlled operation must be possible and must have been activated.● Generally, it must be possible to execute SPOS from the part program, from a synchronizedaction or via FC18: “Start spindle positioning” without errors.Unless all requirements can be met, the function described cannot be used successfully.ActivationThe function of gear stage change at fixed positionis activated by the configuration:MD35010 $MA_GEAR_STEP_CHANGE_ENABLE = 216.4.9 Configurable gear step in M70Technical backgroundIn some machines the spindle needs to be in a particular gear stage during axis mode.Possible reasons:● Only one optimization (KV, feedforward control, filter) to suit a gear stage can be found inthe servo parameter set for axis mode (index 0). The machine data for this parameter setshould not be rewritten.● There is only one mechanical transmission ratio which, unlike the others, possesses littleor no backlash compensation. The spindle can only follow a path motion or transformations(e.g. TRANSMIT) together with other axes in this gear step.S1: Spindles16.4 Configurable gear adaptationBasic FunctionsFunction Manual, 01/2015, 6FC5397-0BP40-5BA2 1263