Code 231-C3B0: Motor %1 does not run under max. current
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Motor %1 does not run under max. current 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] - Motor locked or blocked - Inverter defective - Motor defective - Wrong motor addressed - Assignment of PWM outputs entered incorrectly - Motor power cables mismatched - Motor encoder cable mismatched - Incorrect motor connection - The motor is loaded with the maximum torque [Error correction] - Check the inverter and exchange it if necessary - Inspect the motor and cabling - Check the motor load - Check whether the shaft can run freely - Check the machine parameters - 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-C3B0 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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