Siemens sinumerik 840D sl Function Manual

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Detailed description2.2 Referencing and synchronization of gantry axesSpecial functions: Gantry Axes (G1)12 Function Manual, 11/2006, 6FC5397-2BP10-2BA02.2 Referencing and synchronization of gantry axes2.2.1 IntroductionMisalignment after startingImmediately after the machine is switched on, the leading and synchronized axes may notbe ideally positioned in relation to one another (e.g. misalignment of a gantry). Generallyspeaking, this misalignment is relatively small so that the gantry axes can still be referenced.In special cases (e.g. gantry axes were stopped owing to a disturbance, power failure orEMERGENCY STOP), the dimensional offset must be checked for permissible tolerancevalues and a compensatory motion executed if necessary before the axes are traversed.To execute this compensatory motion, the gantry grouping must be invalidated by means ofthe following machine data:MD37140 $MA_GANTRY_BREAK_UP (invalidate gantry grouping)Gantry synchronizationAll gantry axes must first be referenced and then synchronized after the control system isswitched on. During gantry synchronization, all gantry axes approach the reference positionof the gantry grouping in the decoupled state. The reference position of the gantry groupingfor referencing the gantry axes corresponds to the reference position of the leading axis:MD34100 $MA_REFP_SET_POS (reference point value/destination point for distancecodedsystem)Otherwise, the reference position is the current actual position of the leading axis.These operations for referencing and synchronizing the gantry axes are executedautomatically in accordance with a special flowchart.Referencing processThe flowchart for referencing gantry axes using an incremental measuring system is asfollows:Section 1:Referencing of the leading axisThe axis-specific referencing of the gantry axis will be started by the active machine functionREF upon the leading axis' interface signal from the PLC user program:DB31, ... DBX4.7/4.6 (traversing key plus/minus)The leading axis approaches the reference point (operational sequence as for referencepoint approach).References:/FB1/ Function Manual, Basic Functions, Reference Point Approach (R1)