Code 231-8080: Uz UV 1xx exceeds max.
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Uz UV 1xx exceeds max. 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] - DC-link voltage of the power supply unit too high - Defective braking resistor - Defective power supply unit (infeed/regenerative feedback module) - Interruption in the primary supply (fuses, wires, etc.) - Energy recovery not possible [Error correction] - Inform your service agency - Check the configuration datum (braking of the spindle) - Check the braking resistor - Replace the power supply unit - Check the fuses and wiring of the primary supply
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 231-8080 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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