Code 231-9360: Double speed not possible %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Double speed not possible %1 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] - Control loop on X51 or X52 is defined as 'double speed', although the control loop on X53 or X54 is active - Control loop on X55 or X56 is defined as 'double speed', although the control loop on X57 or X58 is active (only CC 4xx with 8 control loops) [Error correction] - Define the control loop on X51 or X52 as 'single speed', or deactivate the PWM output X53 or X54 - Define the control loop on X55 or X56 is defined as 'single speed', or deactivate the PWM output X57 or X58 (only CC 4xx with 8 control loops) - Inform your service agency [442] 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 231-9360 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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