Code 231-8BD0: Excessive servo lag in %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Excessive servo lag in %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 a moving axis is greater than the value specified in the configuration datum CfgPosControl->servoLagMax1. - Overloaded drive - Insufficient lubrication - Mechanical stiffness - Machine vibration - Hardware error in the control loop - For analog axes, servo defective [Error correction] - Reduce the contouring feed rate, increase the rotational speed - Check the lubrication - Remove mechanical stiffness - Remove any possible sources of vibration - Check the parameter CfgFeedLimits->maxAcceleration - Analog axes: Check the servo - Inform your service agency if the error occurs frequently
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 231-8BD0 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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