Code 701748: Coolant filter monitoring
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Coolant filter 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
Pressure switch on the coolant filter has responded. PLC input signal "coolant filter monitoring“ is not present. The error has the following effect as soon as the end of the machining program has been reached: Feed Stop No axis movements possible. "Spindle Stop" Tool spindle is stopped. Speed no longer possible. The 1st coolant pump, the 2nd coolant pump and the bed rinsing are then turned off. For MT series: Channel-specific "Read-in stop" after pulling bar call ( M450 ) or workpiece counting pulse ( M60 ) on this channel. The other channel, respectively, continues to run until the next tool change or rapid feed ( G0 ). The 1st coolant pump, the 2nd coolant pump and the bed rinsing are then turned off. 1. Check coolant filter (contamination). 2. Check the pressure switch on the coolant filter and the PLC input signal "Coolant filter monitoring". 3. As soon as the malfunction is remedied, press one of the following keys: [FEED START] [CYCLE START] Message is cleared. If there is no coolant filter on the coolant system, the PLC input signal must, if necessary, be bridged (see circuit diagram).
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 701748 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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