Code 702715: Safety: Drive power supply contactor monitoring
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Safety: Drive power supply contactor monitoring 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
A The "Current supply drive" (power contactor) was switched off, but the feedback circuit "Monitoring current supply drive power contactor" is still missing. When the contactor is deactivated, the feedback circuit must signal signal state [1] (check). B When the contactor is activated, the feedback circuit must signal signal state [0] (check). Error messages Safety technology Safety: Drive power supply contactor monitoring For A With [Control OFF], it is not possible to unlock the protective door. Not possible to activate the control. For B Feed Stop and Spindle Stop are output in "AUTO" mode. 1. Check the feedback circuit and the PLC input signal "Contactor, drive power supply monitoring". (It could be that the contactor in the drive is defective) 2. As soon as the malfunction is remedied, press the following key: [RESET] Message is cleared. 3. The control can be activated again. Feedback circuit monitoring takes 2 seconds.
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 702715 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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