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).
: Check the DMG MORI Download Center for official maintenance and instruction manuals tailored to your specific machine serial number.
The Mori Seiki EX series (now DMG MORI EX) are high-performance CNC turning centers known for rigidity, accuracy, and productivity in metalworking. The alarm (error) system on these machines provides numeric and sometimes alphanumeric codes that indicate faults in drives, spindle, axes, probes, I/O, PLC, servo, following errors, temperature, encoder issues, and safety/interlocks. Correct interpretation of alarms is critical for safe, fast troubleshooting and minimizing downtime.
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
| 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. | mori seiki ex alarm list
The CNC safety circuit detects that the operator door is unlatched during automatic execution.
: Cycle start attempted with the chuck open.
The Mori Seiki EX alarm list is a valuable resource for machine operators, providing a comprehensive guide to troubleshooting and resolving issues. By understanding the alarm codes and messages, operators can quickly identify and address problems, minimizing downtime and optimizing machine performance. Regular review of the alarm list, combined with best practices for troubleshooting and maintenance, can help ensure the Mori Seiki EX machine runs smoothly and efficiently.
Check the hydraulic unit pressure gauge. Verify the hydraulic pump motor is running and not tripped on an overload breaker. Check fluid levels in the hydraulic tank and inspect for clogged filters. EX0351 / EX351: Air Pressure Drop This guide is designed to help operators and
The Automatic Tool Changer (ATC) arm or carousel did not complete its mechanical cycle within the allocated PLC time window.
Fix: Ensure the part is correctly loaded and clamped. Check the proximity switches on the hydraulic actuator at the rear of the spindle to ensure they are adjusted correctly for your stroke.
Note: Always consult the specific wiring diagrams and ladder manuals shipped with your machine's serial number for exact bit assignments. The list below represents the most frequent EX codes encountered across Mori Seiki fleets. Fluid and Environmental Alarms EX0151 / EX151: Lubrication Pressure Fault
The interlock was turned during an automatic cycle or feed hold. 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) The alarm (error) system on these machines provides
What is your machine's (e.g., NLX2500 with MAPPS, DuraTurn, SV-500)? What was the machine doing right when the alarm triggered?
Note: Exact alarm numbers and wording can vary slightly depending on your specific machine model, build year, and PLC version. Always consult the electrical schematics and ladder diagram shipped with your specific serial number. EX0001 - EX0099: Door Interlock and Safety Alarms
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