Mori Seiki Ex Alarm List -

Select the softkey, then choose [PMCDGN] and [STATUS] .

| Category | Alarm Code | Common Description | Likely Causes & Troubleshooting Steps | | :--- | :--- | :--- | :--- | | | EX2568 | HYDRAULIC UNIT ALARM | Cause: Low hydraulic pressure, insufficient oil, or a suction problem. Troubleshooting: 1. Check hydraulic pressure (3.5 MPa for NL1500/2000, 4.0 MPa for larger models). 2. Visually inspect tank oil level and for external oil leaks. 3. Clean the suction strainer if the oil level is adequate. 4. If the alarm persists, the pressure switch may be faulty; contact DMG MORI service. | | Spindle Drive | EX0451 | SPINDLE DRIVE UNIT ALARM | Cause: A malfunction in the main spindle drive amplifier. Troubleshooting: 1. Open the electrical cabinet and check the LEDs on the spindle amplifier; note any displayed code. 2. This can be triggered by a door lock device failure. Check the door lock's mounting, key, and locking action. 3. If LEDs indicate no obvious error, a failing component (contactors, motor, or amplifier) is likely. | | Spindle Drive | EX0457 | SPINDLE DRIVE UNIT ALARM #2 | Cause: A malfunction in the secondary (sub) spindle or milling motor drive. Troubleshooting: This alarm is nearly identical to EX0451 and should be handled as a separate drive unit problem. Follow the same amplifier LED checking and physical inspection steps. | | Spindle Drive | EX0491 | SPINDLE SPEED ABNORMAL | Cause: The difference between the commanded spindle RPM and the actual encoder feedback is too great. Troubleshooting: 1. This can happen with a misaligned bar or heavy workpiece that the spindle motor cannot accelerate fast enough. 2. Check the spindle speed sensor near the brake disc for dirt, misalignment, or damage. 3. Reduce the commanded RPM or spindle acceleration rate in parameters as a temporary workaround. | | Gear / Transmission | EX0470 | GEAR SHIFT TIME OVER (Reference R1604.0) | Cause: The gear change mechanism failed to engage the requested gear within the set time. Troubleshooting: 1. For servo-driven shifts, there is a specific "zero return" procedure in the manual to home the gear set. 2. For hydraulic shifts, check hydraulic pressure, solenoid valves, and the limit switches that confirm gear position. | | Door / Safety Interlock | EX1024 | DOOR MUST BE OPENED ONCE | Cause: The safety logic requires the door to be physically opened and closed to reset the interlock system. Troubleshooting: 1. Manually open and close the machine door before pressing [CYCLE START]. 2. If the message persists, the door switch tongue may be stuck in the "closed" position. Remove and reinsert the tongue. | | Door / Safety Interlock | EX1061 | MOTOR INTERRUPTION IS ABNORMAL | Cause: Often related to the door lock safety circuit and can be very difficult to diagnose. Troubleshooting: 1. Check relays in the safety module and examine all first inputs (X0.0 to X3.7) for activity. 2. A known fix on some models was replacing a failed Spindle Amplifier Module (e.g., Fanuc A06B-6088-H226) . Have suspect modules professionally tested. | | Turret / Tool Changer | EX1302-EX1323 | TURRET ROTATING / INDEX RANGE | Cause: These alarms signal problems with turret rotation, indexing, or steady rest operations. Troubleshooting: 1. Ensure the turret is not within the "indexing prohibited zone" for the X-axis. 2. EX1303 occurs if you command M-code (e.g., M340/M341) while the spindle is rotating. Stop spindle rotation before commanding the function. | | Turret / Tool Changer | EX1974 | ST. REST CLAMP / UNCLAMP TIME OVER | Cause: A hydraulic or pneumatic steady rest failed to fully clamp or unclamp within the expected time. Troubleshooting: 1. Check the hydraulic pressure to the steady rest circuit. 2. Inspect the physical condition of the clamp mechanism for binding or obstruction. 3. Verify the function of the clamp/unclamp limit switches. | | Tools / M-Codes | EX0999 | SEQUENCE PROGRAM ERROR | Cause: A generic catch-all for a sequence program error, often triggered by conflicting or unexpected M-codes. Troubleshooting: 1. This can occur if a requested mode conflicts with the machine's current state, such as engaging milling mode on the wrong head. Verify the program's M-codes and the machine's mode status. | | Axis Control | EX2018 | Y AXIS MODE ERROR | Cause: On Y-axis equipped lathes, this is a sequence error, often related to the order of operations for engaging the Y-axis. Troubleshooting: The Y-axis base block must be moved "OUT" before the servo engages or the brake releases. A specific procedure in the manual must be followed to satisfy the sequence interlock. |

| Alarm Code | Description | Probable Cause & Solution | | :--- | :--- | :--- | | | Hydraulic Motor Overload | The hydraulic pump motor drew too much current. • Check the hydraulic oil level (is it low?). • Check for clogged suction filters. • Check the thermal breaker in the electrical cabinet. | | E003 | Hydraulic Pressure Drop | System pressure dropped below the set threshold while the pump was running. • Check for leaks in the lines. • Check the pressure switch setting. • Pump may be worn out. | | E004 | Lubrication Oil Low | The way lube reservoir is empty. • Refill the way oil (typically Mobil Vactra #2). • Check the float switch if the tank is full but the alarm persists. | | E005 | Lubrication Cycle Error | The system did not detect a pressure rise during the lube cycle. • Check if the lubrication pump is working. • Check for blocked lines or a broken distributor block. |

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The tool turret failed to physically unclamp or index within the allotted time window. mori seiki ex alarm list

are external Programmable Machine Control (PMC/PLC) error codes generated by the machine tool builder rather than the core CNC system. While standard NC alarms (like Fanuc or Mitsubishi system errors) indicate core controller faults, EX alarms explicitly signify issues with peripheral machinery, safety interlocks, hydraulics, sensors, and mechanical overloads managed by Mori Seiki's custom logic.

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The control system detects that the front operator door is open during an automatic cycle, or the safety switch is malfunctioning.

Verify tailstock fluid levels. Ensure the tailstock forward/backward limit switches are clean and functioning. EX0300 to EX0399: Turret and Tool Changer (ATC) Alarms Select the softkey, then choose [PMCDGN] and [STATUS]

On the EX series, alarms are generally categorized by their prefix:

Note: Exact EX code definitions can vary slightly depending on your machine model (e.g., NLX, DuraTurn, NHX, Mori Seiki lathe vs. machining center) and the generation of the control. Always consult your specific machine’s wiring diagram and ladder manual for definitive schematics. Common Mori Seiki EX Alarm List & Solutions EX0001 to EX0099: Safety and Door Interlock Alarms

A: You must first follow your machine's "disaster recovery" or "emergency recovery" procedure. This almost always involves referencing specific axes to their home positions, re-establishing the tool magazine status, and confirming the tool changer arm and pallet changer positions. Attempting to just reset and restart will often create mechanical collisions.

Lack of oil or pressure in the tailstock movement system. Check hydraulic pressure (3

The auto-door closed detection signal was deactivated without a command. Check the door limit switch and sensors.

Mori Seiki machines categorize faults using specific lettering systems. Knowing the difference helps you isolate the hardware or software root cause immediately.