Code 231-A900: S traverse range exceeded when braking at contour
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical S traverse range exceeded when braking at contour 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
(SS2) %1 [Cause of error] - When braking at a contour (SS2), the maximum permissible path in the safety-related machine parameter distLimitStop2 was exceeded. [Error correction] - Check the parameter value: distLimitStop2: Axis-specific limit value for maximum permissible path upon SS2 reaction. - Inform your service agency 10/2023 [473]
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 231-A900 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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