Code 700051: Clamping device not clamped
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Clamping device 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
The pressure switches for clamping device monitoring are not signalling correctly on the machining side. The work area should be acknowledged, but the clamping device is not yet clamped. PLC input signal "Clamping device clamped“ is not present. Cause 1: Cause 2: 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. Press the [Clamp/unclamp clamping device] key to clamp the device. 2. Check the pressure switch "Clamping device clamped" and PLC input signals. 3. Check the PLC output signals and "clamp clamping device" valves. 4. Check hydraulic unit system pressure. 5. As soon as the malfunction is remedied, press the following key: [FEED START] Message is cleared. This applies to the pneumatic as well as hydraulic clamping devices.
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 700051 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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