Code 700400: Safety clutch Z-axis disengaged
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Safety clutch Z-axis disengaged 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
Safety clutch of the Z-axis has released. Movement command for the Z-axis is blocked. (A movement of the other axes is still possible) 1. Switch to manual mode. 2. Set feed override switch to 10% (higher settings will be reduced to 10%). 3. Press [Z] key. 4. Activate bridging switch "Z-axis coupling" and at the same time move the Z-axis with key [ + ]. Z-axis motor moves in (+) direction until the safety clutch engages again. After the safety clutch has engaged, the movement command is blocked and the brake for the safety clutch is released again. 5. Press RESET. The message 700432 RE-APPROACH Z-AXIS HOME POSITION (CLUTCH RELEASED) appears. The safety clutch was triggered when traversing the Z-axis (e.g.: as a result of a collision). Safety clutch is also triggered if actuation of the brake „Release safety clutch“ does not occur when traversing the Z-axis (possible defective relay).
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 700400 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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