Mori Seiki Ex Alarm List |work| -

On a Mori Seiki machine, "EX" alarms (External Alarms) are specific to the machine's PLC (Programmable Logic Controller) rather than the underlying Fanuc or Siemens CNC system. They usually signal that a physical condition—like a door being open or a sensor failing—is preventing the machine from operating.

Here is a list of common Mori Seiki EX alarms and what they typically mean: Common Safety & Interlock Alarms

EX0064: Auto-Door Open: The door closed detection signal was lost while the machine was supposed to be running.

EX0069: Door Lock Check Time Over: The system did not receive a "door locked" confirmation signal within the expected timeframe.

EX2027: Interlock Key Switch Released: The safety interlock key was turned to "release" during an automatic cycle.

EX4002: Open the Door then Close: A startup safety check requiring you to cycle the door once to verify the safety circuit. Spindle & Gearbox Alarms

EX0451: Spindle Drive Unit Alarm: A fault in the spindle's electrical drive system.

EX0456: Spindle Index Time Up: The spindle failed to reach its oriented position (indexing) within the allowed time.

EX0470: Gear Shift Error: A failure in the gear-shifting mechanism, often requiring a check of the gear sensors (e.g., SQ22 or SQ23).

EX0491: Spindle Speed Abnormality: The actual spindle speed does not match the commanded speed.

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 mori seiki ex alarm list

: 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

2. Encoder / Feedback Alarms

• Alarm: 2001 / FEEDBACK ERROR

  • Description: Position feedback inconsistent.
  • Typical causes: Encoder malfunction, loose cable, noise interference.
  • First-line actions: Inspect encoder connector, reseat cables, check shielding, run encoder diagnostics.

• Alarm: 2005 / ABSOLUTE ENCODER ERROR

  • Description: Absolute encoder mismatch or initialization failure.
  • Typical causes: Battery/backup loss, absolute value reset, encoder failure.
  • First-line actions: Reinitialize encoder per manual, verify battery/back-up, contact service if persists.

2. EX1004 – CHUCK UNCLAMPED

Symptoms: Cannot start spindle, cannot run program. Troubleshooting: On a Mori Seiki machine, "EX" alarms (External

• Manually clamp chuck using foot pedal or M10.
• Listen for hydraulic pump sound. No sound? Check hydraulic pressure gauge.
• Check proximity sensors on cylinder (clamp/unclamp switches). Often chips block the sensor.
• Override in diagnostics: PLC signal F14.0 (unclamp confirmation). If stuck at 0, replace sensor. Prevention: Clean chuck sensors daily. Use air blow before pallet change.

1. Power & Drive Alarms

• Alarm: 1001 / POWER FAILURE

  • Description: Main power interruption.
  • Typical causes: Mains loss, breaker trip, emergency stop.
  • First-line actions: Check main power, breakers, E-Stop reset; inspect power cables.

• Alarm: 1010 / X-axis SERVO ALARM

  • Description: Servo fault on X axis.
  • Typical causes: Overcurrent, encoder error, motor wiring.
  • First-line actions: Stop motion, verify wiring and connectors, check servo amplifier status, clear alarm and test jog slowly.

• Alarm: 1011 / OVERLOAD (SPINDLE/SERVO)

  • Description: Drive/motor overload.
  • Typical causes: Mechanical jam, excessive cutting load, low supply voltage.
  • First-line actions: Remove tool/work obstruction, reduce feed, check supply voltage and drive cooling.

Preventive maintenance to reduce alarms

• Regular lubrication and mechanical inspection (ways, ballscrews, turrets).
• Keep cables and connectors secured; check for wear and contamination.
• Monitor coolant levels, filters, and cleanliness.
• Maintain proper ambient temperature and ventilation for drives.
• Periodic encoder and servo tuning checks; update firmware per OEM guidance.
• Backup parameters and programs frequently.

3. Troubleshooting Effectiveness

The EX series alarm list is robust for a lathe platform.

• Interlock Chains: Mori Seiki is famous (or infamous) for safety interlocks. The alarm list excels here. If a door won't open or a chuck won't unclamp, the alarm list points to the specific sensor or relay preventing the action.
• Spindle and Turret Diagnostics: For the EX series turning centers, turret crashes are common. The alarm list distinguishes between "Turret Lock Failure" (clamping issue) and "Turret Index Alarm" (rotational issue), which saves hours of diagnostic time.

3. Common NC/System Alarms (Fanuc Based)

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

• PS010 (Improper G-Code): Syntax error in the program.
• OT050 / OT051 (Overtravel): The tool has hit a hardware limit switch.
  • Fix: Press and hold the OT Release button (usually inside the cabinet door or on the operator panel)

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 Alarm: 2001 / FEEDBACK ERROR

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? 

8. Safety & Emergency Alarms

• Alarm: 9001 / EMERGENCY STOP

  • Description: E-Stop activated.
  • Typical causes: Operator pressed E-Stop, safety condition.
  • First-line actions: Resolve hazard, reset E-Stop, follow safe restart procedure.

• Alarm: 9005 / SAFETY CIRCUIT FAULT

  • Description: Safety circuit integrity compromised.
  • Typical causes: Wiring fault, safety relay failure.
  • First-line actions: Do not operate machine until inspected; contact qualified technician.

Quick troubleshooting checklist (operators)

1. Stop machine motion; ensure safe state.
2. Note exact alarm code and message.
3. Check for obvious mechanical jams or safety triggers.
4. Power-cycle control if alarm persists after basic checks (when safe).
5. Inspect connectors, cables, and fuses related to alarmed subsystem.
6. If unresolved, document conditions and contact qualified service.