Code 330-00BA: MC error in the cut-out channel STO.A.x (-STO.A.P.x=1) %2
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical MC error in the cut-out channel STO.A.x (-STO.A.P.x=1) %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] The cutout channel test detected a fault: The axis-specific pulse release for the power stage over the A channel is defective. Switch-off signal: STO.A.P.x Switch-off signal: STO.A.x The acknowledgment signal for this cutout channel has the wrong condition, i.e. when - JH inverter: Power stage reports "no readiness" (RDY.x=0), although "readiness“ (RDY.x=1) is expected. - DRIVE-CLiQ inverter: Associated diagnostic signal is "0", although "1" is expected. [Error correction] - Check the wiring (PWM cable) - Hardware error (power module, controller unit) - 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 330-00BA 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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