Siemens SINUMERIK 840D sl Function Manual

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PreconditionsThe following preconditions must be satisfied for an axis to be compensated:● Direct and indirect measuring system, mechanically coupled:– MD30200 $MA_NUM_ENCS = 2– MD31040 $MA_ENC_IS_DIRECT[ 0 ] = 0 or 1– MD31040 $MA_ENC_IS_DIRECT[ 1 ] = 1 or 0● Measuring system calibration has been released:MD34102 $MA_REFP_SYNC_ENCS = 1● Both measuring systems are referenced:– DB31, ... DBX60.4 (referenced/synchronized 1 / 2) = 1– DB31, ... DBX60.5 (referenced/synchronized 1 / 2) = 15.3.3.1 Commissioning: Axis-specific machine dataDelay timeThe delay time, during which the closed-loop control smoothly transitions from the indirect tothe direct measuring system, is entered in the machine data.MD32960 $MA_POSCTRL_DUAL_FEEDBACK_TIME = If the delay time is zero, then the function is inactive, and only the active measuring system(DB31, ... .DBX1.5 / .6 (position measuring system 1 / 2) ) is active for the position control.NoteAfter activating the "Dual position feedback" function, all of the existing measuring systemcompensations and monitoring functions remain unchanged and active; this means that theymay have to be deactivated by the user (e.g. backlash compensation values deleted).5.3.3.2 Supplementary conditionsReferencing and flying measurementAlso when the "Dual position feedback" function is active, the "Referencing" and "Measuring"functions refer to the active measuring system (DB31, ... .DBX1.5 / .6 (position measuringsystem 1 / 2) ).References● Function Manual Basic functions, Chapter "R1 Referencing"● Function Manual Extended Functions, Chapter "M5 measuring"K3: Compensations5.3 Backlash compensationExtended Functions264 Function Manual, 10/2015, 6FC5397-1BP40-5BA3