Code 231-C610: TRC: PWM freq. too high %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical TRC: PWM freq. too high %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 axis for which the torque ripple compensation was activated through MP2260.x is being driven with a PWM frequency of more than 5000 Hz. [Error correction] - Inform your service agency - Adjust the PWM frequency for the axis to a value less than or equal to 5000 Hz - To deactivate the compensation, delete the entry in MP2260.x
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-C610 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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