Code 280-04A5: Chamfer angle cannot be machined with the active tool
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Chamfer angle cannot be machined with the active tool 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] The programmed angle of the chamfer cannot be machined with the active tool. [Error correction] Check the value in input parameter Q354: The chamfer angle must be half of the point angle (TANGLE) of the tool. Enter the value 0 in Q354 in order to create a chamfer with half of the point angle (T-ANGLE) of the tool.
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 280-04A5 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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