Mori Seiki Ex Alarm List May 2026

This is the strongest point of the Mori Seiki documentation compared to some competitors.

No single article can list every EX alarm, because machine builders and integrators add custom alarms. To get the official and complete list:

If you want, I can:

Mori Seiki "EX" alarms are external PLC (Programmable Logic Controller) alarms generated by the machine's ladder logic rather than the core Fanuc or Mitsubishi NC system. These codes specifically monitor machine-side components like doors, sensors, and fluid levels. Common EX Alarm Categories

Safety & Interlocks: Often triggered by the physical state of the machine during a cycle start.

EX0024 (CHUCK UNCLAMPED): Cycle start attempted with the chuck open.

EX0026 (DOOR NOT CLOSED): Attempting operation while the safety door is open.

EX0069 (DOOR LOCK CHECK TIME OVER): The door lock signal was not confirmed within the expected timeframe.

Fluid & Pressure Issues: Vital for preventing mechanical damage.

EX0560 (AIR PRESSURE LOW): Sudden drop in incoming air pressure.

EX0561/0562 (LUBRICANT PRESSURE LOW): Lubrication system failed to reach or maintain pressure; often indicates a pump failure or broken line.

EX2566 (HIGH-PRESS. COOLANT SYSTEM): An abnormality in the high-pressure coolant unit. Spindle & Turret States:

EX0453 (MILL SPINDLE ALARM): Indicates an issue with the mill spindle drive or amplifier.

EX0456 (SPINDLE INDEX TIME UP): Orientation or indexing took too long, suggesting a mechanical stall or sensor failure.

EX0095 (TURRET ILLEGAL MOVEMENT): The turret moved without a command; requires checking the driver or clamp signal. Troubleshooting Tips Mori Seiki Alarm Codes Overview | PDF - Scribd

Mori Seiki are machine-specific external alarms generated by the PLC (Programmable Logic Controller) rather than the standard CNC control (e.g., Fanuc or Mitsubishi). They typically relate to peripheral devices like the

turret, tool changer, lubrication system, or safety interlocks 🛠️ Common Mori Seiki EX Alarms Operational & Setup Alarms Need Zero-Return

– The machine requires an X or Z-axis reference return before operation. Editing Switch Key is ON

– Cycle start was attempted while the write-protect key was in the "ON" position. Chuck Unclamped

– Attempted to start a cycle while the chuck was not securely closed. Door Not Closed

– Safety door interlock is active; the door must be closed to start the cycle. Turret & Tooling Alarms Turret Illegal Movement

– The turret attempted to move without a command; check the output driver or clamp signal. Need Turret Zero-Return

– The turret station is not indexed to the correct home position. EX0356/0357: Turret Index Time Over

– The turret failed to complete its rotation within the allotted time; often caused by mechanical obstruction or sensor failure. EX0374/0375: Tool Life Up – Pre-set tool life count has reached its limit. Spindle & Motor Alarms Spindle Drive Unit Alarm – A fault has occurred in the spindle amplifier or drive. Spindle Orientation Time Up

– The spindle failed to reach its oriented stop position within the set time. EX1037/1038/1040: Overload Alarms

– Spindle, X-axis, or Z-axis is experiencing excessive load, possibly due to a crash or dull tooling. Maintenance & Fluid Alarms Electrical Cabinet Overheat mori seiki ex alarm list

– Temperature inside the cabinet is too high; check fans and filters. Air Pressure Drop

– Incoming shop air pressure is below the minimum required for tool changes or clamping. Oil Pressure Low

– Hydraulic pressure has dropped below the operating threshold. Insufficient Lubrication Oil

– Way-lube tank is low; refill the reservoir to clear the alarm. 🔍 Troubleshooting Steps Check the Message:

Most EX alarms include a brief text description on the screen. Inspect Sensors: Many EX codes (like EX0069 Door Lock

) are triggered by proximity switches that may be dirty or misaligned. Reset Power: For logic-based errors (like

), turning the machine power OFF and then ON can sometimes clear the state. Verify Fluid Levels:

Always check oil, air, and coolant levels first for any code in the

To help you troubleshoot a specific issue, could you tell me: exact alarm number showing on your screen?

of Mori Seiki machine you are using (e.g., NL, NH, DuraTurn)? What the machine was doing right before the alarm occurred? Mori Seiki Alarm Codes Overview | PDF - Scribd

combination M-commands have been mistakenly given at the same time. * EX0013, M85-COMMAND WITH SPINDLE ON, ALM0013, A0. 0, An M85. Mori Seiki Alarm Codes Overview | PDF - Scribd

pressed together with the O.T. release button after the hard O.T. limit switch has been. tripped. EX0064, AUTO-DOOR OPEN, ALM0064,

Mori Seiki EX Alarm Codes Overview | PDF | Lubricant - Scribd

Mori Seiki Ex Alarm List: Understanding and Troubleshooting

Mori Seiki, a leading manufacturer of CNC machines, provides an extensive range of alarm codes to help users diagnose and troubleshoot issues with their equipment. The Mori Seiki Ex alarm list is a comprehensive guide to understanding and resolving alarms that may occur on their machines.

What is the Mori Seiki Ex Alarm List?

The Mori Seiki Ex alarm list is a detailed catalog of alarm codes, descriptions, and troubleshooting procedures for Mori Seiki CNC machines. The list includes alarms for various machine models, including lathes, milling machines, and machining centers.

Common Mori Seiki Ex Alarms

Some common Mori Seiki Ex alarms include:

Troubleshooting Mori Seiki Ex Alarms

When an alarm occurs on a Mori Seiki machine, refer to the Ex alarm list to diagnose and troubleshoot the issue. Here are some general steps to follow:

Conclusion

The Mori Seiki Ex alarm list is a valuable resource for users to diagnose and troubleshoot issues with their CNC machines. By understanding the alarm codes and following the recommended troubleshooting procedures, users can quickly resolve issues and minimize downtime. Regular maintenance and checks can also help prevent alarms from occurring in the first place.

Over 60% of EX alarms are preventable. Follow this monthly checklist:

Alarm: 4010 / SPINDLE OVERHEAT

The Mori Seiki EX alarm list is more than a table of codes – it is a diagnostic roadmap into the machine’s PLC logic. While no single article can list every possible EX alarm (Mori Seiki has produced hundreds of control variants over 40+ years), the codes and categories covered here represent the vast majority of daily production stoppages.

Always start by verifying the obvious: hydraulic fluid levels, door closures, and chip conveyor jams. When those fail, access your machine’s PMC message history or log into the DMG MORI service portal with your serial number. For the rare, undocumented EX alarm, reading the PLC ladder directly is your ultimate fallback.

Final Reminder: Never bypass an EX safety alarm (e.g., door interlock or chuck clamp confirmation) to save cycle time. They exist to protect both the operator and the multi-ton machine investment. When in doubt, call a certified DMG MORI service technician – but now, with this guide, you’ll know exactly which EX alarm to report.

Need the exact EX alarm list for your specific model? Leave a comment with your machine’s year and control type, and we can narrow down the most common failure points.

EX alarm list for Mori Seiki CNC machines typically refers to external alarms

generated by the machine's Programmable Logic Controller (PLC) rather than the base Fanuc or Mitsubishi control

. These alarms often relate to machine-specific mechanical conditions, safety interlocks, and auxiliary equipment. Common Mori Seiki EX Alarms EX0006 - Wrong Combination of M-Codes : An invalid set of M-commands was given simultaneously. EX0018 - Need Zero-Return

: A cycle start was attempted without completing the necessary X or Z-axis zero returns. EX0024 - Chuck Unclamped

: Cycle start activated while the chuck was not securely clamped. EX0026 - Door Not Closed : The machine door is open during a cycle start attempt. EX0029 - Tailstock Inching / Quill Not Out

: Attempted cycle start during tailstock movement or with the quill in the wrong position. EX0069 - Door Lock Check Time Over

: The system did not receive a door lock confirmation within the expected timeframe. EX0095 - Turret Illegal Movement

: The turret attempted to move without a valid command; often requires checking the output driver or clamp signals. EX0099 - Panel Alarm

: General error related to the operator panel or its power supply. EX0491 - Spindle Speed Abnormal

: The actual spindle RPM deviates significantly from the programmed speed; often caused by mechanical resistance or sensor issues. EX0551 - Electrical Cabinet Overheat

: Excess heat detected in the electrical control unit; check filters and cooling fans. EX0560 - Air Pressure Low

: The incoming air pressure has dropped below the operational threshold. EX1047 - PMC Parameter Error

: Often indicates that PC spec parameters have been cleared or corrupted. General Troubleshooting Steps Check Physical Conditions : Verify air and hydraulic pressures are stable under load. Inspect Sensors

: On legacy machines, aging or dirty proximity sensors (especially on the ATC, turret, or door) are the most common cause of EX alarms. Review I/O Status

: Use the diagnostic or PMC/I/O status screens to see which signal the PLC is missing. Reference Manuals

: Because EX codes are machine-specific (e.g., a DuraVertical vs. an NL-series lathe), always consult the Operation Manual Ladder Diagram specific to your serial number for exact definitions. Are you currently seeing a specific alarm code on your screen, and what machine model are you working on?

top Legacy Mori Seiki CNC Error Codes Explained & How To Fix

Troubleshooting Mori Seiki EX Alarms: A Field Guide If you're staring at a Mori Seiki EX Alarm, you’re dealing with an "External" or PLC-side error. Unlike standard Fanuc CNC alarms that focus on the internal motion control, EX alarms are usually triggered by peripheral machine conditions—like a door that won't lock, a pressure sensor that's tripped, or a turret that isn't seated properly.

Below is a breakdown of common Mori Seiki EX alarm codes and practical steps to clear them. Common Mori Seiki EX Alarm Codes Message / Description Primary Fix / Check EX0069 Door Lock Time Over Check for chips in the door track or a faulty lock sensor. EX0099 Panel Alarm If you want, I can:

Typically related to the operator panel or power supply conditions. EX0453 Mill Spindle Alarm A fault is present in the spindle amplifier or drive unit. EX0551 Electrical Cabinet Overheat

Clean the cabinet filters and check if the cooling fans are spinning. EX0557 Oil-Air Lubricant Pressure Low

Verify your lubricant levels and check for leaks in the air lines. EX2027 Interlock Key Switch Release

The interlock was turned during an automatic cycle or feed hold. EX2566 High-Pressure Coolant System General abnormality in the coolant pump or system pressure. EX2595 Coolant Unit Filter Clogged The filter is restricted; it needs cleaning or replacement. EX2909 Door is Opening (Timer Power-on)

Front door was not closed when the weekly timer turned the machine on. Pro Troubleshooting Steps

Check Physical Interlocks: Many EX alarms are "safety chain" issues. Ensure all doors are fully closed, the interlock key is in the correct position, and emergency stop buttons are released.

Inspect Consumables: Alarms like EX0557 (Lubricant) or EX2595 (Filter) are often simple maintenance reminders. Before calling a tech, verify oil levels and clean your filters.

Ladder Logic Diagnosis: 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.

Power Cycle & Re-Homing: For transient errors, especially after a battery change (see EX2562), you may need to reset the home position via parameters (often Parameter 1815 for Fanuc-based Mori machines). Why "EX" Alarms Matter

Because these are machine-specific rather than control-specific, they vary between a Mori Seiki NLX lathe and an NHX machining center. Always refer to your machine’s specific Maintenance Manual for the definitive EX list tailored to your serial number.

Do you have a specific code currently on your screen that isn't listed here? Mori Seiki SL 15 with MF-T6 controller: resolving APC alarm

Comprehensive Mori Seiki EX Alarm List & Troubleshooting Guide

Mori Seiki CNC machines are known for their precision and durability, but operational errors—signaled by EX alarms—are inevitable in a busy production environment. Unlike standard CNC control alarms (like Fanuc P/S alarms), EX codes are "External" or machine-specific alarms defined by Mori Seiki’s own Programmable Logic Controller (PLC).

Understanding these codes is essential for minimizing downtime and ensuring the safety of both the operator and the machine. 1. Common Mori Seiki EX Alarm Categories

EX alarms are typically triggered by mechanical interlocks, sensor feedback, or peripheral device issues. They can be broadly categorized into several operational groups: Safety & Interlock Alarms

EX0026 / EX1928: DOOR NOT CLOSED – The cycle was started without the front door being properly closed and locked.

EX0023: START INTERLOCK ON – An external signal (like an emergency stop on a barfeeder) is preventing the cycle from starting.

EX2027: INTERLOCK KEY SWITCH RELEASED – The door interlock key was turned to "Release" during an automatic cycle. Spindle & Tooling Alarms

EX0451: SPINDLE DRIVE UNIT ALARM – Indicates a fault within the spindle amplifier or drive circuitry.

EX0456: SPINDLE INDEX TIME UP – The spindle failed to orient or index within the allotted time.

EX0412: CHUCK UNCLAMPED – A spindle rotation command was given while the chuck was not securely clamped.

EX0491: SPINDLE SPEED ABNORMAL – The actual spindle RPM deviates significantly from the programmed speed, often due to excessive load or parameter errors. Hydraulic & Lubrication Alarms

EX0561 / EX0562: LUBRICANT PRESSURE LOW – The lubrication system pressure has dropped or failed to build up, possibly due to a broken pipe or motor failure.

EX0570: INSUFFICIENT LUBRICATION OIL – The oil level in the lubrication tank is low and needs to be refilled.

EX2568: HYDRAULIC UNIT ALARM – A general fault detected within the hydraulic system. 2. Extended EX Alarm List Reference

Below is a reference for frequently encountered EX alarm codes found across Mori Seiki lathes and machining centers: Mori Seiki Alarm Codes Overview | PDF - Scribd