Clean the safety switch assembly. Replace the door interlock switch if internal contacts are failing. 4. Chuck, Tailstock, and Fixture Alarms (EX0600 - EX0799)
On most modern Mori Seiki machines (such as those with Fanuc 32iB or MSG-501 controls), follow these steps to save the history: Insert a USB Drive : Locate the USB port on the operation panel. Navigate to System Menu : Press the Find Alarm/History
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Mori Seiki CNC machines are renowned for their rigidity, precision, and advanced control systems. Whether your machine runs on a classic MAPPS interface, a Fanuc-based control, or a Mitsubishi system, encountering an alarm is inevitable during standard operating lifecycles.
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. mori seiki ex alarm list
: Often triggered by the physical state of the machine during a cycle start.
Note: Exact alarm numbers can change based on your specific Mori Seiki model, such as an NLX lathe, NT mill-turn, or NHX vertical mill. Always check your machine manual for your exact build.
A tool retriever or a tailstock is in the wrong position.
: If the alarm message is vague, seasoned operators use the NC Ladder screen to find the specific bit (e.g., an X-input or R-bit) triggering the alarm. This tells you exactly which sensor or switch the machine is waiting for. Clean the safety switch assembly
The Ultimate Mori Seiki EX Alarm List: Diagnostic Guide & Troubleshooting Reference
External alarms directly impact your Overall Equipment Effectiveness (OEE). Implement these practices to prevent them:
The chip conveyor motor drew too much current, indicating a physical jam.
: Use the right arrow softkeys to find "OPERATIONAL HISTORY" or "ALARM HISTORY". Execute Output Chuck, Tailstock, and Fixture Alarms (EX0600 - EX0799)
The Mori Seiki EX Alarm List is a testament to intelligent machine design. It transforms a complex assembly of mechanical, electrical, and fluid power systems into a transparent and communicative partner for the operator. By distinguishing external, machine-specific alarms from generic controller errors, it provides a clear diagnostic pathway from symptom to solution. For any shop operating Mori Seiki or DMG MORI equipment, familiarity with this list is not optional—it is the key to minimizing downtime, protecting precision components, and maintaining the productive rhythm of modern manufacturing. Ultimately, the EX Alarm List gives the machine a voice; it is the skilled operator’s job to listen, interpret, and act accordingly.
| Component | Check | Prevents EX Alarm(s) | | :--- | :--- | :--- | | Hydraulic breather | Replace filter | EX1402, EX1425 | | Way lube tank | Refill, check for water contamination | EX1411 | | Chip conveyor motor | Clean swarf from limit switch | EX2010, EX2011 | | Turret coupling | Clean, light oil mist | EX1506 | | Door interlock switches | Test with meter for continuity | EX1001 |
Because EX alarms are specific to the machine's PLC (Programmable Logic Controller), the exact meaning can vary between models (e.g., NLX, NHX, or older SL series). You can find the definitive list for your specific machine in: The Operation Manual: Look for the "Alarm/Error List" section. The CNC Screen:
– If you have access, some EX alarms are embedded in Fanuc’s PMC ladder comments. Use the PMC → Message screen.
The tailstock body or quill is not in the correct position for machining, or the forward pressure switch wasn't satisfied when pressing against the part center.