Code 280-04A7: Spindle angle not unique
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Spindle angle not unique 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] You tried to orient the tool spindle even though the relative position between the input and tool coordinate systems prevents an unambiguous determination of the spindle angle. During a probing operation the center offset (CAL_OF1 and CAL_OF2) defined for the touch probe cannot be taken into account correctly. [Error correction] Avoid a spindle orientation under these conditions: - Status of the transformations and position of tilting axes - Active turning operation Probing: - Exactly align the touch probe mechanically and do not define any values for the center offset (CAL_OF1 and CAL_OF2).
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 280-04A7 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code 280-04A7.
Need a searchable reference for more Heidenhain TNC Series CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026