Code 231-E240: Axis %1 faulty braking process
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Axis %1 faulty braking process 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] - Axis was incorrectly braked during an SS1 reaction. Possible causes: - Adjusted delay time of the dv/dt monitoring (timeToleranceDvDt) is insufficient. An acceleration might occur after expiration of the delay time. - Drive is not optimally adjusted - Brake ramp in machine parameter motEmergencyStopRamp is not correctly adjusted [Error correction] - Check the entry in machine parameter timeToleranceDvDt - Check the adjusted braking ramp for emergency stops in machine parameter motEmergencyStopRamp - Check the velocity of the drive during the braking process with the control's internal oscilloscope - Adjust the drive. - Inform your service agency [562] 10/2023
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-E240 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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