Code 280-0494: Gear wheel definition incorrect
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Gear wheel definition incorrect 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 definition of the tooth geometry is incomplete or contradicts itself. The module and number of teeth are necessary for the definition of a gear tooth system according to DIN 3990 (ISO 6336). Outside diameter and tooth height are optional entries. The outside diameter must be greater than the inside diameter. [Error correction] Enter the module and the number of teeth. If there are deviations from DIN 3990 (ISO 6336) then you can define the outside diameter and tooth height. Check the definition of the outside diameter and tooth height. 10/2023 [907]
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 280-0494 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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