Code 230-04B0: Invalid PWM frequency configured for axis %2
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Invalid PWM frequency configured for axis %2 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 incorrect or invalid PWM frequency was configured. Frequencies up to 10 kHz are possible for CC 61xx and UEC 1xx. For Gen3 devices, depending on the UM device only frequencies up to 10 kHz are possible, or even only specific individual frequencies. [Error correction] Check and correct the configuration under CfgPowerStage->ampPwmFreq. 10/2023 [369]
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 230-04B0 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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