Code 280-0490: Machining depth does not increase monotonously
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Machining depth does not increase monotonously 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 calculated machining depth does not increase monotonously. The programmed entries result in a machining depth that was already exceeded by a previous cut. [Error correction] Reduce either the first infeed or the number of infeeds. The last infeed must be smaller than the first one. Check the following entries: - First infeed Q586 - Last infeed Q587 - Number of infeeds Q584
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 280-0490 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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