Siemens SINUMERIK 840D Function Manual

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● Constant cutting rate (G96, G961, G97, G971)● Spindle actual speed display● Axis mode● Synchronous spindle setpoint couplingResynchronizing the position measuring system for the spindleIn the following cases, the spindle position measurement system must be resynchronized:● The position encoder is on the motor, a contactless proximity switch is mounted on thespindle and the gear stage is changed. Synchronization is triggered internally once thespindle is rotating in the new gear stage (see Synchronization procedure).● The machine has a selector switch for a vertical and horizontal spindle. Two differentposition encoders are used (one for the vertical spindle and one for the horizontal spindle),but only one actual value input is used on the controller. When the system switches from thevertical to the horizontal spindle, the spindle must be resynchronized.This synchronization is initiated with the NC/PLC interface signal:DB31, ... DBX16.4 (resynchronize spindle 1)orDB31, ... DBX16.5 (resynchronize spindle 2)The spindle must be in open-loop control mode.Restoring the position after a warm restartFor spindles with incremental position measuring systems, it is possible to buffer the actualvalues after a POWER OFF and after POWER ON, to restore the position last buffered beforeswitching-off, in order that position-dependent functions, e.g. transformations can be restored(see Section "Automatic restoration of the machine reference (Page 332)"). One application, forexample, is the tool retraction after a warm restart during processing with tool orientation (seeFunction Manual Basic Function, Section "Tool retraction after POWER ON with orientationtransformation").The following NC/PLC interface signals display the state of the position measuring system afterthe position has been restored:DB31, ... DBX71.4 ("Restored 1") for position measuring system 1DB31, ... DBX71.5 ("Restored 2") for position measuring system 2Once the tool has been retracted in JOG mode, axes whose positions have been restored arereferenced. As a consequence, signals DB31, ... DBX71.4/5 ("Restored 1/2") are deleted andsignals DB31, ... DBX60.4/5 ("Referenced/synchronized 1/2") are set.NoteIf machine data MD20700 $MC_REFP_NC_START_LOCK is set to a value of "2", then an NCstart is also possible with "restored" axis positions (in the MDI mode or when overstoring).S1: Spindles18.3 Reference / synchronizeAxes and spindles774 Function Manual, 06/2019, A5E47437747B AA