Code 703161: Amplification motor, main spindle is not engaged
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Amplification motor, main spindle is not engaged 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 of "Engage amplification motor, main spindle" is output, but the response from the corresponding sensor is missing. PLC input signal "Amplification motor, main spindle, engaged" is not registered. Feed STOP and Spindle STOP No spindle enable. If the sensor signals correctly again within a certain monitoring time, the machine continues to run again immediately. After the monitoring time has elapsed, the machine stops. 1. Check sensor "Amplification motor, main spindle, engaged" and the associated PLC input signals. 2. Check the value of the current of the analogue sensor. 3. Check actuation and the valve "Engage amplification motor, main spindle". 4. Check spindle positioning of the main spindle and the amplification motor. If they do not agree, it could be that the coupling is stuck. 5. As soon as the malfunction has been remedied, press [FEED START] or [CYCLE START]: Message is cleared. The menu can be found under: [MENU SELECT] Chiron diagnosis total >> Amplific. Main spi. Error messages Tool spindle Amplification motor, main spindle is not engaged
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 703161 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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