Mori Seiki Ex Alarm List May 2026
You do not always need a service manual. If your machine is powered on and you have access to the control panel (standard or maintenance level), you can view the current and historical EX alarm list directly.
These alarms appear across multiple platforms—lathes (NL, DuraTurn, CTX), mills (NH, NMV), and mill-turns (NT, MT).
| EX Alarm | Typical Message | Common Cause | |----------|----------------|---------------| | EX1001 | DOOR OPEN | Safety interlock – door switch open during auto operation. | | EX1002 | TOOL LIFE OVER | One or more cutting tools have exceeded their preset tool life (counts or time). | | EX1003 | LOW AIR PRESSURE | Air supply < 0.4-0.5 MPa. Pneumatic chuck/clamp cannot actuate. | | EX1004 | CHUCK UNCLAMPED | Chuck unclamp confirmation sensor not made. | | EX1005 | TAILSTOCK NOT RETRACTED | Tailstock quill not fully back during part unload. | | EX1006 | COOLANT LEVEL LOW | Coolant tank level below minimum sensor. | | EX1007 | HYDRAULIC UNIT OVERTEMP | Hydraulic oil temp > 55°C (131°F). | | EX1008 | SPINDLE OIL FILTER CLOGGED | Spindle oil filter differential pressure high. | | EX1009 | CHIP CONVEYOR OVERLOAD | Chip conveyor motor thermal overload relay tripped. | | EX1010 | BAR FEEDER ALARM | External bar feeder fault (e.g., bar empty, feeder misaligned). | | EX1011 | LUBRICATION PRESSURE LOW | Centralized lube pump pressure switch open. | | EX1012 | SPINDLE ORIENTATION FAIL | M19 spindle orientation not completed within time. | | EX1013 | TOOL CLAMP/UNCLAMP ERROR | ATC (automatic tool changer) – tool not clamped or unclamped correctly. | | EX1014 | COUNTER SPINDLE SYNCHRO FAIL | C-axis or spindle sync error on twin-spindle lathe. | | EX1015 | SAFETY CIRCUIT TRIPPED | Emergency stop button, light curtain, or safety relay open. |
To appreciate the EX Alarm List, one must first distinguish it from standard system alarms. A system alarm, often displayed as a numeric code (e.g., 1020, 2001), originates directly from the CNC controller (typically a Fanuc, Mitsubishi, or Siemens unit) and indicates a problem with the core control logic—such as an overloaded servo, a broken encoder, or a loss of reference position. These alarms are generic across many machine brands using the same controller.
EX Alarms, however, are unique to the machine builder. The "EX" stands for External or, more accurately, Machine Builder-Specific Alarm. These alarms are programmed by Mori Seiki’s engineers within the ladder logic (PLC) of the machine. They monitor the peripheral systems—coolant pumps, chip conveyors, hydraulic units, door interlocks, tool changers, and lubrication systems. When an operator sees an alarm like “EX1040 SPINDLE UNIT LUBRICATION LOW,” this is not a generic controller alarm but a custom message created by Mori Seiki to pinpoint a condition specific to their machine’s design.
On Mori Seiki machines (typically using MAPPS interfaces or Fanuc controls), EX alarms refer to External (PLC) Alarms. These are generated by the machine tool builder rather than the CNC control itself, usually relating to peripheral hardware like the chip conveyor, tool changer, or coolant system. Common Mori Seiki EX Alarm Categories
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:
EX0001 – EX0499: Safety and Operation Alarms (e.g., Door Open, Emergency Stop). mori seiki ex alarm list
EX0500 – EX0999: Lubrication and Hydraulic Alarms (e.g., Low Oil Level, Pressure Drop). EX1000 – EX1999: Tool Changer (ATC) and Turret Alarms.
EX2000 – EX2999: Peripheral Equipment (e.g., Chip Conveyor, Bar Feeder, High-Pressure Coolant). Frequently Encountered EX Alarms Alarm Code Common Solution EX0000 Emergency Stop
Check all E-stop buttons (including bar feeder or conveyor). EX0501 Lubrication Level Low
Refill the way lube tank. Check for leaks if it empties quickly. EX1024 Turret Index Error
The turret failed to seat or clamp. Check for chips in the turret face. EX2041 Chip Conveyor Overload
Usually caused by a "rat's nest" of chips jamming the belt. Reverse the belt to clear. EX2500 Door Interlock
The door was opened during a cycle or the lock sensor is dirty/misaligned. How to Troubleshoot EX Alarms You do not always need a service manual
Check the Message: On the MAPPS or Fanuc screen, press the [MESSAGE] or [ALARM] hard key. EX alarms usually provide a text string (e.g., EX0501 LUBRICATION PRESSURE LOW).
Check the Ladder/Diagnostics: If the message is vague, look at the Diagnostic (DGNOS) bits. Mori Seiki manuals often list specific bits that trigger these alarms.
Inspect Physical Sensors: Since EX alarms are PLC-based, they are often triggered by a limit switch, proximity sensor, or pressure switch.
Consult the Manual: Every Mori Seiki machine is shipped with a "Maintenance Manual" or "Ladder Diagram" specific to its serial number. You can find digital versions or parts lists through Scribd or the DMG MORI Service Portal.
Do you have a specific EX alarm number appearing on your screen right now?
Mori Seiki EX Alarm List
The Mori Seiki EX alarm list is a comprehensive guide to troubleshooting and understanding the various alarms that may occur on Mori Seiki EX CNC machines. The following list outlines the most common alarms, their descriptions, and possible causes: To appreciate the EX Alarm List, one must
Alarm List:
Troubleshooting Steps:
Preventative Maintenance:
Regular maintenance can help prevent alarms and ensure optimal machine performance. Recommended maintenance tasks include:
This is just a draft, and you may need to modify it to fit your specific needs and requirements. Additionally, it's essential to consult the official Mori Seiki documentation and support resources for accurate and up-to-date information on alarms and troubleshooting procedures.
Entry-level Dura series share simpler alarms: