Code 701746: Max. vacuum chamber coolant level
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Max. vacuum chamber coolant level 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 float switch in the vacuum chamber signals "Maximum" (signal status = 0). The switch is evaluated after a delay time (T80). The switch turned on and off 4x within a monitoring time of (T81). The PLC input signal "Coolant level vacuum chamber MAX." is not present. Feed Stop and Spindle Stop after end of program The 1st coolant pump, the 2nd coolant pump, bed rinsing and the seal water pump are switched off. 1. Check coolant level. 2. Check the float switch "Coolant level vacuum chamber MAX" and the PLC input signal. 3. As soon as the malfunction is remedied, press one of the following keys: [FEED START] [CYCLE START] Message is cleared.
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 701746 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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