Code 700734: Flow monitor cooling unit 2
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Flow monitor cooling unit 2 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
Cooling unit was switched on. After the delay time has elapsed, the PLC input signal "Flow monitor cooling unit 2" still signals signal state [0]. After switching on the cooling unit, the flow monitor is monitored for signal state [1] after a short delay time. Error messages Cooling unit Flow monitor cooling unit 2 Error message appears immediately. Exception: The effect of the malfunction only manifests itself 10 seconds after the pump (cooling unit) is switched on. "Feed Stop", as far as no thread-cutting or tool change is pending. "Spindle Stop", as far as no thread-cutting or tool change is pending. The controller enable of the spindles and axes is cancelled. 1. Check the setting of the flow monitor and the coolant flow. 2. Check the PLC input signal "Flow monitor cooling unit 2". 3. As soon as the malfunction has been remedied, press the [FEED START] or [JOG] and [RESET] keys. Message is cleared. Detailed information regarding the cause of the malfunction can be found in the operating instructions of the cooling unit.
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 700734 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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