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?
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
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 mori seiki ex alarm list
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
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.
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.
This guide is designed to help operators and maintenance technicians understand the alarm structure, common codes, and troubleshooting steps for Mori Seiki EX lathes (typically running on Mori Seiki MS/MSC or Fanuc-based controls).
The NL series often includes alarms for sub-spindle and live tooling.
The Mori Seiki EX series (including EX-101, EX-106, etc.) is known for reliability, but like all CNC machines, it communicates issues through specific alarm codes. Understanding the difference between System Alarms and Machine Alarms is the first step in troubleshooting.
If you want, tell me the exact alarm codes/messages shown on your EX machine and I’ll provide step-by-step diagnostics and likely fixes.
(Invoking related search suggestions...)
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: 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: On Mori Seiki machines (typically using MAPPS interfaces
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 "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
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
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 Part 2: How to Retrieve the Full Mori
: 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
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