Code 702819: Controller enable BT axis missing
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Controller enable BT axis missing 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
Controller enable was output for the BT-axis, but the return signal via the drive interface is missing. The error has the following effect: Feed Stop No axis movements possible. "Spindle Stop" Tool spindle is stopped. Speed no longer possible. Read disable Control reads no further program blocks into memory. 1. Please see the additionally pending error messages. 2. Once the malfunction has been remedied, press [RESET] key The message is cleared. Error messages Axes (>Z) Controller enable BT axis missing
Source: CHIRON Error Message Overview, all series (Siemens control, V2.0.6, 2012)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Chiron Siemens-Control CNC Alarms
Chiron controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 702819 on the Siemens-Control CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Chiron's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 545 Chiron Siemens-Control CNC codes.
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