Code 231-8910: Velocity too high for rotor position measurement %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Velocity too high for rotor position measurement %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] - An excessively high velocity was detected during the rotor position measurement - Cause 1: The rotor position is measured at a vertical axis without counterweight - Cause 2: The motor is in a poor switch-on position. The axis controls a certain position. [Error correction] - Regarding cause 1: Measure the rotor position with another method. Only methods that measure the rotor position at standstill are allowed. - Regarding cause 2: Restart the rotor position measurement - 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 231-8910 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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