Code 702338: A-axis clamping not clamped
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical A-axis clamping not clamped 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
Actuation "Clamp A-axis clamping" was output, but the axis clamping is not yet clamped or still signals unclamped. PLC input signal "A-axis clamping clamped" is not registered. PLC input signal "A-axis clamping unclamped" is still registered. The error has the following effect: Feed Stop No axis movements possible. Read disable Control reads no further program blocks into memory. If the sensor signals are correct within a monitoring period, the program run is continued. After the monitoring time has elapsed, the machine stops. 1. Check the PLC input signals "A-axis clamping unclamped", "A-axis clamping clamped" and the pressure sensors. 2. Check the PLC output signals "Unclamp A-axis clamping", "Clamp A-axis clamping" and the valves. 3. Once the malfunction has been remedied, press [FEED START]. Message is cleared.
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 702338 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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