[2021] — Mori Seiki Ex Alarm List
Lack of oil or pressure in the tailstock movement system.
Lathe / Turning Center Specific Alarms (NL, NLX, SL, DuraTurn) EX0401 / EX401: Chuck Unclamp / Clamp Fault
The machine attempted to spin the spindle or move an axis while the front operator door or an access panel was detected open.
Twist and release all E-stop buttons around the machine cell. Check if a peripheral device (like a bar feeder) is powered off. EX0100 to EX0299: Fluid, Pressure, and Lubrication Alarms
1. Turn off the conveyor power.2. Manually clear any jammed parts, stringy chips, or debris.3. Reset the thermal overload switch inside the electrical cabinet. AIR PRESSURE DROP mori seiki ex alarm list
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 automatic way-lube system failed to build up or vent pressure within the programmed time limit.
On machining centers, the tool magazine failed to rotate to the targeted tool pot within the allocated time limit. Systematic Troubleshooting Protocol for EX Alarms
The hydraulic unit pressure has dropped below the safe operating threshold. Check the hydraulic oil level, the pressure gauge, and the pressure switch functionality. Lack of oil or pressure in the tailstock movement system
The "EX" in EX alarms stands for . These alarms indicate that a condition outside the main CNC control core has been triggered.
These pallet-changing machines have additional EX alarms:
The door lock confirmation signal was not received within the expected time . Turret and Tooling
Never let way lube or coolant drop near the critical minimum line. Establish a morning routine to top off all reservoirs. Check if a peripheral device (like a bar
Triggered directly by the drive amplifiers in the electrical cabinet. Common Mori Seiki EX Alarm List & Solutions
A massive percentage of EX errors are caused by chips, sludge, or coolant interfering with proximity sensors. Locate the sensor associated with the fault (e.g., chuck clamped sensor, turret clamp sensor), clean it thoroughly, and verify if the built-in LED indicator changes state when metal passes in front of it. How to Prevent Frequent EX Alarms
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.