Code 231-C780: Error while braking a drive %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Error while braking a drive %1 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] It was not possible to brake the drive when switching off. An unexpected acceleration of the drive was detected during the braking procedure. Possible causes: - Switch-off time is parameterized to be too brief - Load is too high - Too much noise in the signals of the speed encoder [Error correction] Remedy: - Check the machine parameter timeLimitStop1 (system with integrated functional safety (FS)) or delayTimeSTOatSS1 (system with external safety) - Check the load - Check the speed encoder - Inform your service agency
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-C780 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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