Mori Seiki Ex Alarm List <HD 2025>

The Mori Seiki EX alarm list is not a nuisance—it is a diagnostic goldmine. Each EX code points directly to a sensor, a logic condition, or an operator action that needs attention. By understanding the most common codes (EX1001 to EX1052) and how to systematically troubleshoot them, you can reduce average repair time from hours to minutes.

Keep a printed EX alarm quick-reference sheet near your machine’s electrical cabinet. Train every operator to differentiate between an EX alarm (usually a recoverable condition) and an NC alarm (requires deeper technical intervention). And finally, use historical EX alarm data to drive predictive maintenance—because the best downtime is the one that never happens.

Need a specific EX alarm explained? Leave your machine model and full EX message in the comments below, or consult your local DMG Mori technical support with the 4-digit code and alarm text exactly as shown on the screen.

Last updated: 2025-10-01. Compatible with MAPPS IV, MAPPS V, and Celos 5.x. For Fanuc 31i-based Mori machines, EX alarms may appear as “USER ALARM” followed by a number – refer to the separate Fanuc PMC manual.

Mori Seiki "EX" alarms are PLC-related messages that originate from the machine tool builder rather than the underlying CNC control (such as Fanuc or Mitsubishi). These alarms typically indicate mechanical, electrical, or sequence-related issues specific to the machine's peripheral hardware, such as the hydraulic unit, automatic tool changer (ATC), or door interlocks.

Below is a categorized list and troubleshooting guide for common Mori Seiki EX alarms. Common Mori Seiki EX Alarm Codes Alarm Code Description & Potential Cause EX0018 NEED ZERO-RETURN

Cycle start was activated before completing X and Z-axis zero returns after a machine lock cancel. EX0020 EDITING SWITCH KEY IS ON

Cycle start was attempted while the Edit Key switch was still in the ON position. EX0024 CHUCK UNCLAMPED

Attempted cycle start without the chuck being properly clamped. EX0026 DOOR NOT CLOSED The machine door is open, preventing cycle initiation. EX0069 DOOR LOCK CHECK TIME OVER

The door lock confirmation signal did not reach the control within the allotted time. EX0095 TURRET ILLEGAL MOVEMENT

The turret moved without a command; often caused by a faulty output driver or clamp signal. EX0099 PANEL ALARM

Indicates a general failure on the operation panel or flat-panel, often requiring a hardware check. EX0344 IMPROPER TURRET

The turret station number is out of the parameter range set for the machine. EX0453 MILL SPINDLE ALARM A fault in the milling spindle amplifier or drive unit. EX1001 HYDRAULIC UNIT ALARM

The hydraulic power unit reports a fault, such as low pressure or readiness failure. EX1449 SENSORING TOOL IN SPINDLE

The tool state prevents the ATC from returning or removing the tool in the spindle. Troubleshooting Steps Mori Seiki Alarm Codes Overview | PDF - Scribd

Symptoms: Conveyor stops, EX1009 appears after M-code M63 (conv on). Troubleshooting:

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.

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

– 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

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 mori seiki ex alarm list

: 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

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.

Mori Seiki machine "EX" alarms generally refer to external PLC alarms (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

While specific codes can vary slightly between models (e.g., NLX, NMV, or Dura), the following are frequent "EX" alarms and their standard meanings: Door & Safety Interlocks EX0026: Door not closed during cycle start.

EX0068 / EX0069: Door interlock or door lock check time over.

EX1024: Door must be opened once before starting a new cycle. Spindle & Turret Operations EX0312 / EX0386: Turret zero-return required.

EX0356 / EX0357: Turret indexing time-out (Turret #1 or #2). EX0456: Spindle orientation or indexing time-up.

EX0406: Spindle interlock signal is ON (prevents rotation due to a safety condition). Fluid & Pressure Systems EX0554: Oil-air pressure still down. EX0560: Air pressure drop/low. EX0561: Hydraulic oil pressure low. EX0570: Insufficient lubrication oil (Level Low). EX2568: Hydraulic unit alarm. Load & Overload EX1037 / EX1038: Spindle or X-axis overload. EX1050 / EX1051: Spindle or X-axis load warning. Peripheral & Operator Panel EX0097 / EX0099: Operator panel I/O or general panel alarm. EX0911 / EX0968: Bar stock has run out (Barfeeder). Troubleshooting Resources

For detailed lists and diagnostic procedures, refer to these professional documentation sources:

Comprehensive Lists: The Mori Seiki EX Alarm Code List on Scribd provides a high-level overview of codes from EX0013 through EX2027.

Official Downloads: Check the DMG MORI Download Center for official maintenance and instruction manuals tailored to your specific machine serial number.

Advanced Diagnostics: If a code is ambiguous, technicians often use the NC Ladder screen to find the specific coil (e.g., M7429 for EX0406) triggering the alarm to identify the missing sensor or signal condition.

Are you currently seeing a specific EX alarm number on your machine's screen that you need help clearing?

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

Mori Seiki EX Alarms are machine-specific external errors triggered by the Programmable Machine Control (PMC) rather than the base Fanuc or Mitsubishi CNC system. These codes typically relate to physical machine hardware like doors, turrets, spindles, and safety interlocks. www.scribd.com Common EX Alarm Categories Safety & Interlocks : Issues with door locks, emergency stops, or safety tests. Turret & Tooling

: Problems with turret indexing, clamp/unclamp signals, or illegal tool commands. Spindle & Tailstock

: Spindle speed abnormalities, lubrication failures, or tailstock position errors. Environment & Maintenance

: Overheating in electrical cabinets or low pressure in oil-air lubrication systems. www.scribd.com Frequent Mori Seiki EX Alarm Codes Alarm Code Description / Solution AUTO-DOOR OPEN Auto-door closed signal deactivated without a command. DOOR LOCK CHECK Door lock signal not received within the specified time. TURRET ILLEGAL

Turret moved without a command; check output driver or clamp. PANEL ALARM General operator panel or power supply condition error. IMPROPER T-CODE An invalid tool command was issued (Head 2/Turret 2). SPINDLE DRIVE Spindle drive unit alarm has been activated. SPINDLE SPEED Spindle speed abnormality detected; check parameters/unit. CABINET OVERHEAT

Excessive heat in the electrical cabinet; check filters/fans. LUBE PRESSURE Oil-air lubricant pressure is too low. Z-AXIS OVERLOAD Z-axis is overloaded during operation. BATTERY LOW Change the battery for memory backup. Execute safety validation test before starting operation. 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, www.scribd.com

Mori Seiki EX Alarm Code List | PDF | Switch | Equipment - Scribd

Mori Seiki EX Alarms are machine-specific (external) errors typically generated by the machine's PLC rather than the core CNC system (like Fanuc) . These alarms generally relate to physical interlocks, hardware sensors, and peripheral operations like the turret, tailstock, or lubrication system . Common EX Alarm Categories

Below are frequently encountered Mori Seiki EX alarms and their general causes: Interlocks and Safety

EX0024 (CHUCK UNCLAMPED): Cycle start attempted while the chuck was not clamped . The Mori Seiki EX alarm list is not

EX0026 (DOOR NOT CLOSED): Attempted to run the machine while the protective door was open .

EX0069 (DOOR LOCK CHECK TIME OVER): The door lock confirmation signal was not received within the expected time . Turret and Tooling

EX0207 (T-CODE NOT COMMANDED): Tool call rejected, often due to an error in the tool table or pot mapping .

EX0312 (NEED TURRET ZERO-RETURN): The turret is not indexed to the correct starting position .

EX0356/0357 (TURRET INDEX TIME OVER): Turret failed to complete indexing within the specified time, possibly due to a mechanical jam or faulty proximity switch . Fluid and Pressure Systems

EX0551 (ELEC. CONTROL UNIT OVERHEATING): Abnormal temperature rise in the electrical cabinet; check filters and cooling fans .

EX0560 (AIR PRESSURE DROP): Pneumatic pressure has fallen below the safe operating threshold .

EX0561 (OIL PRESSURE LOW): Decrease in hydraulic pressure; often tied to pump or piping issues .

EX0570 (INSUFFICIENT LUBRICATION OIL): Way lube level is low and needs to be refilled . Spindle and Drive

EX0451 (SPINDLE DRIVE UNIT ALARM): General fault in the spindle drive; check the drive unit itself for a secondary error code .

EX0456 (SPINDLE INDEX TIME UP): Spindle orientation or indexing failed to complete in the allowed time . Troubleshooting Steps

Identify the Signal: Navigate to the machine's message screen to view the active alarm history. PLC-specific alarms like EX codes can often be traced back to a specific "coil" or signal in the LADDER diagram (e.g., searching for signal X1009.5 for door sensors) .

Check Physical States: Verify that all sensors (proximity switches, pressure switches) are clean and properly triggered. For hydraulic alarms like EX2568, check the Hydraulic Power Unit (HPU) for its own internal error codes .

Manual Reset: Some alarms require a full power cycle or a specific manual reset procedure (like re-homing an axis using "P+CAN") to clear .

For exhaustive documentation, you can refer to comprehensive guides such as the Mori Seiki EX Alarm Code Overview or the Dura Vertical Alarm List. Mori Seiki Alarm Codes Overview | PDF - Scribd

Mori Seiki are machine-specific (external) alarms typically defined by the machine tool builder rather than the CNC control manufacturer (like Fanuc or Mitsubishi). These often relate to peripheral equipment or physical machine states. Mori Seiki EX Alarm categories and specific codes include: Common EX Alarm Codes EX0001 (Thermal Relay Tripped):

Usually indicates an overload in a motor (spindle, coolant pump, or hydraulic motor). Check the circuit breakers/overload relays in the electrical cabinet. EX0002 (Emergency Stop):

Triggered when an E-stop button is pressed or there is a fault in the E-stop circuit. EX0151 (Coolant Level Low):

The coolant tank level has dropped below the minimum sensor threshold. EX0451 (Spindle Lube Alarm):

Indicates an issue with the spindle lubrication system, such as low oil or a pressure fault. EX1011 (Door Open):

The machine door is not closed or the interlock sensor is not engaged while attempting a cycle. Where to Find Your Specific Alarm

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:

Most modern Mori Seiki (DMG MORI) machines allow you to press the

hard key, which often provides a brief description and a "Help" or "Detail" soft key for troubleshooting steps. Ladder Diagram:

For advanced troubleshooting, the alarm number corresponds to a specific bit in the PLC ladder. If you are looking for a specific code like , let me know the machine model

, and I can look up the specific troubleshooting steps for you. or help you troubleshoot a specific alarm number AI responses may include mistakes. Learn more

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:

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.

The service engineer, Kenji Tanaka, had seen the inside of a thousand machine shops. Grease under his fingernails was a permanent feature, and the whine of a high-speed spindle was his lullaby. But the DMG Mori Seiki NTX 2000 on the floor of Tanaka Industries was different. It was a beast, a five-axis symphony of German precision and Japanese soul. And right now, it was singing a song of pure fury.

The red light on the pendant blinked with the rhythm of a panicked heartbeat. EX 1047: COLLISION DETECTED. TOOL MAGAZINE AXIS (Z6).

Kenji sighed. He’d seen this before. The operator, a kid named Hiro, was pale as a ghost. "I swear, Tanaka-san," Hiro stammered, "I zero-returned everything. The tool changer arm was clear. It just… screamed."

Kenji didn’t blame him. The "EX" in the alarm list stood for "External," a catch-all for everything the main NC (Numerical Control) couldn’t categorize. It was the machine’s shadow language, a place where hardware failures, PLC (Programmable Logic Controller) logic conflicts, and user errors all bled together. Unlike a simple "OVERLOAD" alarm, an EX alarm required detective work.

He pulled up the EX Alarm List on the MAPPS IV panel. It wasn't just a list; it was a confession. The list was divided into sections: EX 1000s for tool management, EX 2000s for hydraulics, EX 3000s for safety interlocks. The problem was, the manual’s description for EX 1047 was frustratingly vague: "Abnormal load on magazine servo. Check physical interference and servo parameters."

Physical interference. That was the key. Kenji grabbed a flashlight and crawled into the belly of the beast. The tool magazine was a massive chain drum holding 240 tools. He rotated it by hand, listening. Click. Click. Click. Smooth. Then, at position 173, a faint scrape.

He peered into the gloom. There, wedged between the chain link and the guide rail, was a tiny, shattered ceramic chip from a broken milling insert. It was smaller than a grain of rice, but to a servo drive expecting perfect torque curves, it was a boulder. The machine hadn't crashed because Hiro had done anything wrong. It had crashed because a previous operator had ignored a dull tool, the insert had shattered, and the shrapnel had found a home in the magazine's heart.

But the story didn't end there. Kenji cleared the chip and tried a reset. The EX 1047 cleared. Then, a new alarm flickered: EX 2128: COOLANT LEVEL LOW (TANK 2). Annoying, but not the killer. He filled the tank. Then came EX 0912: SPINDLE OIL FILTER CLOGGED (PREDICTIVE).

This was the genius of the Mori Seiki system. It wasn't just a list of emergencies; it was a story of neglect. The clogged filter had caused higher back-pressure. The higher pressure had starved the hydraulic unclamping mechanism, making the drawbar grip a tool holder just a little too tightly. When the tool changer tried to pull that holder from position 173, the servo had to fight. It won the fight, but the jarring motion had dislodged the ceramic chip that had been resting on top of the holder. The chip fell into the chain guide, and the next tool change caused the EX 1047.

It was a cascade failure, a domino line of "minor" issues that the machine's predictive diagnostics had been screaming about for weeks.

Kenji called Hiro over. "The EX alarm list is not your enemy," he said, wiping grease off his hands. "It's the machine screaming for help before it dies. EX 0912 appeared three weeks ago in the history log. Did anyone check it?"

Hiro looked at his shoes. "The shift supervisor said it was a 'ghost alarm.' He cleared it." Last updated: 2025-10-01

Kenji nodded. That was the real problem. The machine was smarter than the people maintaining it. He spent the next four hours replacing the oil filter, flushing the coolant tank, re-greasing the tool magazine guide rails, and resetting the servo load parameters. When he finally powered up the NTX 2000, the spindle roared to life, smooth as a whisper. He ran a test cycle. Tool change after tool change. No EX alarms. Just the clean, rhythmic thunk-thunk-whir of precision engineering.

Before he left, he printed the last 90 days of the EX alarm history and taped it to the supervisor’s door. He circled the first appearance of EX 0912 and wrote in permanent marker: "This is where your $10,000 repair bill started. Next time, listen to the list."

The machine never threw an EX 1047 again. But more importantly, the operators learned that the EX Alarm List wasn't a curse. It was a conversation. And if you ignored it long enough, the machine would have the last word.

To generate a report or export a list of Mori Seiki EX alarms directly from the machine, you typically need to use the CNC's system menu to output the history to an external USB or memory card. How to Export the Alarm Report

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

: Use the right arrow softkeys to find "OPERATIONAL HISTORY" or "ALARM HISTORY". Execute Output

: Select the history type you need (System Alarm or Operation) and press the softkey to copy the file to your USB. Common Mori Seiki EX Alarm List

"EX" alarms are machine-specific external alarms often related to safety interlocks, sensors, and peripherals. Alarm Code Typical Cause / Solution START INTERLOCK ON Cycle start pressed while an external interlock is active. CHUCK UNCLAMPED

Attempting to start the cycle while the chuck is not clamped. DOOR NOT CLOSED The front door is open during a cycle start command. DOOR LOCK TIME OVER

The door lock signal was not confirmed within the allowed time. PANEL ALARM General error with the flat operation panel or its I/O. ELECTRICAL CABINET OVER HEAT

Internal temperature too high; check cabinet filters and fans. OIL-AIR LUBRICANT PRESSURE LOW Low pressure in the lubrication system. HIGH-PRESS. COOLANT SYSTEM Abnormality detected in the high-pressure coolant unit. COOLANT UNIT FILTER

The coolant filter is clogged and needs cleaning or replacement. EXECUTE SAFE TEST

Safety validation is required before the machine can operate. Troubleshooting "EX" Alarms Mori Seiki Alarm Codes Overview | PDF - Scribd

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

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

Since the EX series utilizes Fanuc controls (typically 16i/18i/21i or 0i-TD/TC), you will see standard Fanuc alarms.

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).

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 

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? 

The true value of the EX Alarm List emerges during unplanned downtime. Consider a scenario: A Mori Seiki NLX lathe suddenly stops mid-operation with the message “EX0315 COOLANT TANK LEVEL LOW.” Without the EX list, an operator might waste hours checking the CNC program, servo drives, or tool offsets. With the list, the diagnosis is immediate: either the coolant has evaporated, there is a leak, or the level sensor has failed. The machine has effectively diagnosed itself.

Moreover, the EX list aids in preventive maintenance. A recurring “EX0421 FILTER CLOG DETECTED” alarm, even after resetting, indicates a deeper issue—perhaps a failing pump or excessive debris in the system. By tracking which EX alarms occur most frequently, maintenance teams can shift from reactive repairs to data-driven predictive maintenance, addressing component wear before a catastrophic failure occurs.

Symptoms: Cannot start spindle, cannot run program. Troubleshooting:

Despite its utility, the EX Alarm List is not infallible. Several challenges exist: