Code 231-8BC0: Motor current %1 too high
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Motor current %1 too high 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] - Incorrect motor or power module selected. - Volts-per-hertz spindle: Ramp gradient too high - Power module defective - Motor cable defective (short circuit) - Motor defective (short circuit, ground fault) - Humidity has entered the motor [Error correction] - Inform your service agency - Are the correct motor and power module selected? - Volts-per-hertz spindle: Readjust the ramp gradient (OEM) - Check the motor and motor cable for a ground circuit or short circuit - Exchange the power module
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 231-8BC0 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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