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You will need your machine's serial number. Once logged in, go to: Documentation → Electrical Diagrams → Alarm List (PLC Messages) . The EX list is usually in Appendix B of the maintenance manual.
Unplanned downtime cuts into profit margins. Implement these daily and weekly habits to prevent EX faults before they stop your spindles.
The turret failed to seat or clamp. Check for chips in the turret face. Chip Conveyor Overload
Mori Seiki machine "EX" alarms generally refer to (Machine Alarms) defined by Mori Seiki rather than the standard NC alarms provided by the control manufacturer like Fanuc . These codes typically signal issues with peripheral machine functions such as sensors, door interlocks, hydraulics, and tool changers. Common EX Alarm Categories
When a sensor fails to activate within a set time, or a hydraulic pressure switch remains open, the PLC triggers an EX alarm.
Safety interlocks protect the operator from high-speed moving parts and flying debris.
While you should always consult the specific wiring diagrams and ladder manuals for your exact machine serial number, the following list represents the most frequently encountered EX alarms across Mori Seiki platforms. 1. Fluid, Pressure, and Lubrication Alarms
Complete Mori Seiki EX Alarm List: Troubleshooting and Solutions
Do not confuse EX alarms with SV (Servo) alarms or OT (OverTravel) alarms. Resetting an EX alarm often requires cycling power or entering a specific reset M-code (such as M470 on DuraTurn series to reset chip conveyor faults).
Top up the coolant tank with the correct water-to-soluble-oil ratio. Clean the float switch if it is stuck with chips. EX0152: Coolant Pump Motor Overload
– The spindle failed to orient or index within the allotted time.
Check all E-stop buttons (including bar feeder or conveyor). Lubrication Level Low
What the machine was doing exactly when it faulted (e.g., changing tools, rapid moving, starting the spindle). The specific block of G-code on the execution screen. Step 2: Perform Visual and Physical Checks Many EX alarms are caused by simple physical discrepancies:
