Code 700263: Main spindle clamped without tool (1)
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Main spindle clamped without tool (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
Actuation "Clamp tool" was output, but the response from the monitoring function for "Tool clamped" is not correct. According to the sensor signals, there is no tool in the spindle. Feed Stop and Spindle Stop after ending the tool change. If there is no tool in the spindle, and this is intentional, the program can be continued by pressing the following keys at the same time: [CYCLE START] and [FEED START] key Precondition: The speed was not programmed to be greater than 800 rpm. 1. Change the tool in the spindle. 2. Check the PLC output signals and the actuation of the "Unclamp tool" and "Clamp tool“ valves. 3. Check sensors and corresponding PLC - input signals. Check the voltage value of the analogue sensor. 4. Check the setting of the collet chuck and analogue sensor relative to the adjustment instructions. NOTICE! Adjustment should only be carried out by trained and instructed personnel. 5. As soon as the malfunction has been remedied, press [CYCLE START] or [FEED START] key. Message is cleared and the machining program can be continued. Error messages Tool management Main spindle clamped without tool (1)
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 700263 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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