Code 280-047D: Offset of the turning spindle unknown
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Offset of the turning spindle unknown alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] A offset set in the rotary spindle for the milling operation cannot be considered for the necessary coupling of the eccentric turning. An offset can be defined by the workpiece datum, pallet datum or PLC datum. [Error correction] If you can ensure that no offset is needed, you can continue machining. In order to consider the offset, the configuration must be changed. Contact your machine tool builder. The rotary spindle must be included as axis in turning mode in the programmable axes (CfgChannelAxes/progAxes or CfgKinSimpleModel/progAxes). This rotary axis must make reference to the active channel spindle (CfgProgAxis/relatedAxis). 10/2023 [901]
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 280-047D on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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