Code 330-00AD: Impermissible deviation of safe machine parameters
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Impermissible deviation of safe machine parameters 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] Safe machine parameters deviate between the individual parameter blocks of a safe axis. This is not allowed. The values have to match in all parameter blocks of an axis: - Encoder input - PWM output - Encoder resolution per path - Counting direction - Line count [Error correction] - Check the entries of the safe machine parameters and correct them if necessary - Switch the control off and on again - If the values of the machine parameters have been changed, they are to be loaded by entering the manufacturer's password. Then a corresponding acceptance test must be run. - Inform your service agency. [1168] 10/2023
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 330-00AD 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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