Code 280-0938: Error in VTC.TAB
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Error in VTC.TAB 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] Entries in the table PLC:\VTC\VTC.TAB are incorrect: - An entry is missing from the feed rate fields - Both FMAX and a numerical value were entered for a feed rate - An incorrect string was entered instead of FMAX [Error correction] Check VTC.TAB and enter the values correctly
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 280-0938 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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