The red light on the pendant blinked with the rhythm of a panicked heartbeat.
The main coolant tank is running low on water/soluble oil mixture. Refilling the tank usually clears this alarm instantly.
Go to the screen on your control panel. Look up the specific PMC parameter or "D-bit" associated with that external alarm (referenced in your Mori Seiki ladder manual). This shows you exactly which physical contact (NO/NC) is breaking the circuit. Step 5: Power Cycle the Machine mori seiki ex alarm list
These errors relate to peripheral management, including chips, coolant, and temperature controls.
This article provides a comprehensive overview of the (also commonly found on DuraTurn and DuraVertical series), focusing on interpreting these "EX" codes and offering troubleshooting steps to get your CNC machine back into production. The red light on the pendant blinked with
Effective troubleshooting requires moving beyond the alarm text itself to understand the mechanical and logical sequence the machine was attempting. By learning to use your machine's diagnostic tools—primarily the ladder logic and I/O screens—and by following structured maintenance, you can transform the EX alarm from a frustrating stop signal into a valuable guide for rapid, accurate diagnosis.
When a sensor fails to activate within a set time, or a hydraulic pressure switch remains open, the PLC triggers an EX alarm. Go to the screen on your control panel
A massive percentage of EX errors are caused by chips, sludge, or coolant interfering with proximity sensors. Locate the sensor associated with the fault (e.g., chuck clamped sensor, turret clamp sensor), clean it thoroughly, and verify if the built-in LED indicator changes state when metal passes in front of it. How to Prevent Frequent EX Alarms
Check the electrical manual to see the "truth table" for that specific alarm.