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In the NCK/PLC Menu, navigate to Axis > Reference and verify reference point search status for both axes involved in the transformation (typically X and Y for planar TRAFO). Check the axis display shows 'REF OK' status.

Execute manual axis referencing if required: use MDI mode and issue G code command G74 (reference point approach) or use the HMI Jog/Manual menu to drive each axis to its home switch and complete the reference sequence per MD 36010 (reference point approach direction).

Ensure workpiece is clear and machine is in safe state before referencing axes.

Verify transformation selection logic in the NC program. Remove any TRAFO activation (M code or G code) that occurs before G74 or reference completion. Restructure the program to execute G74 first, then allow cycle start to proceed with TRAFO selection.

Test the program flow in DRY RUN mode (via HMI Settings > Program Control) to confirm all axes reach REF OK status before the first transformation-dependent move command is executed.

Access Siemens SINUMERIK configuration via HMI > Diagnostics > Parameter Editor. Locate MD 28200 (Transformation Type) and MD 28201 (Transformation Axis Link) and note which axes are assigned (e.g., AXIS1=X, AXIS2=Y for standard Cartesian transformation).

Verify in MD 30010 that both axes listed in the transformation configuration are declared as 'Axis' type (not spindle, not virtual). Cross-check axis names in the transformation parameters against the actual physical axis names defined in the control (NCK > Axis Configuration menu).

If axis assignment is incorrect, edit MD 28201 to match the correct axis names, save parameters, and perform a 'Warm Reset' or 'Cold Reset' (via HMI System > Restart) to reload transformation metadata into the NCK.

Warm Reset will halt execution; ensure no active program is running.

After parameter correction, re-execute axis referencing (G74) on the corrected axes and retry the transformation activation.

Check the system status bar in the HMI Diagnostics view for any 'Battery Low' warnings or recent power cycle notifications. Review the NCK error log (Diagnostics > Alarm History) for recent encoder or reference point errors (alarms 200xx-210xx range).

On incremental encoder systems, manually jog both transformation axes to the mechanical reference point (home switch/limit) and initiate reference point search via G74 or HMI menu. This re-establishes absolute position correlation between encoder counts and machine coordinates stored in MD 32100.

Do not rely on last known position; always perform fresh referencing after power loss.

For systems with absolute encoders, check encoder connection status in Diagnostics > Encoder Status. If encoder fault codes appear (e.g., 'Encoder 1 Sync Lost'), contact field service to replace encoder or recalibrate absolute position offset per service manual procedure.