Code 700747: Power failure: Shut off main switch
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Power failure: Shut off main switch 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 machine control was switched on, but the drive module still reported an error. The PLC input signal "Drive control monitoring" signals (1). The "Drive controller monitoring function" is activated, e.g. in the event of a power failure so that the machine control is immediately switched off, whereby the axes can still be controllably stopped. The drive module is no longer ready for operation. 1. Switch off the machine with [Main switch OFF] 2. Switch on the machine with [Main switch ON] 3. Switch on the machine control with the [Control ON] key. 4. Press [RESET] key. Message is cleared. Signal state "Drive control monitoring": 0 = machine control switched on 1 = machine control switched off
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 700747 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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