Code 231-4400: Excessive following error (axis: %1)
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Excessive following error (axis: %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] - The following error of an axis exceeds one of the following error limits. - The acceleration entered is too large. - The motor does not move in spite of “Drive on.” [Error correction] - Reduce the contouring feed rate, increase the rotational speed. Remove any possible sources of vibration. Inform your service agency if the error occurs frequently. - Check the acceleration (CfgFeedLimits/maxAcceleration) - Check the following error limits (CfgPosControl/servoLagMin[1/2] or servoLagMax[1/2]) - The motor current must not be under limitation during acceleration
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 231-4400 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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