Among these, are unique. Unlike system-level NC faults, EX alarms are generated by the machine tool builder’s Ladder logic. They indicate issues with the machine's peripheral systems, safety interlocks, fluid levels, or mechanical limits.
Here is a list of the most common EX alarms that CNC operators face: EX0101 / EX101: Lubrication Pressure Drop
The tool magazine failed to locate the correct tool pot within the allocated time.
EX alarms originate from the ladder logic. They are not hardware failure alarms (those usually start with "SV", "SP", or "OH"). Instead, EX alarms are triggered by: mori seiki ex alarm list
Inspect hydraulic hoses for bubbles or leaks. Verify that all electrical cabinet fans are spinning and filters are free of oily dust. To help narrow down the issue, let me know: What is the exact EX alarm number and text on your screen?
Knowing this bypasses the need for a full EX list in an emergency.
: Safety and Operation Alarms (e.g., Door Open, Emergency Stop). Among these, are unique
The turret failed to index within the allowed time or failed to seat and clamp back down properly after indexing.
These alarms protect the operator and the machine from physical crashes. They are frequently triggered by faulty sensors or mechanical misalignments.
The red light on the pendant blinked with the rhythm of a panicked heartbeat. Here is a list of the most common
Because EX alarms are defined by the machine builder (Mori Seiki), the exact code can vary slightly between models (e.g., NLX, NTX, DuraVertical). However, they generally follow these ranges:
| Alarm Code | Probable Cause | Immediate Action | | :--- | :--- | :--- | | | Turret clamp failure (unclamped) | Check turret clamping proximity switch. Hydraulic pressure low? | | EX1506 | Turret index time out | Tool binding. Clean turret curvic coupling. Check turret motor brake. | | EX1522 | Live tool motor overload (C-axis tool) | Reset thermal overload relay in electrical cabinet. | | EX2501 | ATC (Auto Tool Changer) arm out of position | Return ATC arm manually using the hydraulic release button. | | EX2510 | Tool magazine not at position | Re-home magazine with M-code (M80/M81 on some Mori models). |