Siemens SINUMERIK 840D Function Manual

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The minimum gear stage speed is effective only in speed mode and can only be undershot by:● Spindle override 0%● M5● S0● DB31, ... DBX4.3 (spindle stop)● DB31, ... DBX2.1 (withdraw controller enable)● DB21, ... DBX7.7 (reset)● DB31, ... DBX2.2 (delete distance-to-go / spindle reset)● DB31, ... DBX18.5 (oscillation speed)● DB21, ... DBX7.4 (NC stop axes plus spindles)● DB31, ... DBX1.3 (axis/spindle disable)● DB31, ... DBX16.7 (delete S value)Maximum speedThe maximum speed of the gear stage of a spindle is configured in machine data:MD35130 $MA_GEAR_STEP_MAX_VELO_LIMIT[]The speed setpoints, generated taking into account the override, are limited to this speed.The following NC/PLC interface signal is set in the case that the speed is limited:DB31, ... DBX83.1 (speed setpoint limited)18.8.5 Diagnosis of spindle speed limitationSystem variablesThe effective/limiting spindle parameters can be read via the following system variables: Thesystem variables must be indexed with the spindle number and they return values only relevantin the speed control and spindle position modes.System variable Meaning$AC_SMAXVELO[] Maximum possible spindle speed [RPM].$AC_SMAXVELO_INFO[] Identifier for the speed-limiting data element.$AC_SMINVELO[] Minimum possible spindle speed [RPM].$AC_SMINVELO_INFO[] Identifier for the speed-increasing data element.$AC_SMAXACC[] Maximum possible spindle acceleration [rev/s2].$AC_SMAXACC_INFO[] Identifier for the acceleration-limiting data element.$AC_SPIND_STATE[] Spindle status in speed-control mode.: 0, 1, 2, ... maximum spindle number (0: current master spindle of the channel)S1: Spindles18.8 Spindle monitoringAxes and spindlesFunction Manual, 06/2019, A5E47437747B AA 829