1. Top off the coolant reservoir with the correct water/oil mixture.2. Clean chip debris away from the float sensor to prevent sticking.3. Check for external fluid leaks.
Generated by the machine tool builder (Mori Seiki) via the Programmable Logic Controller (PLC) or Ladder Logic.
| 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. |
Before diving into the list, it helps to understand how Mori Seiki classifies its errors:
Complete Guide to Mori Seiki EX Alarms: Troubleshooting and Fixes mori seiki ex alarm list
: The system did not receive a door lock confirmation within the expected timeframe. EX0095 - Turret Illegal Movement
Turret errors are common on lathes after an accidental tool bump or collision.
Unplanned downtime is expensive. Implementing a rigorous preventive maintenance routine will stop many common EX alarms before they ever trigger:
Often, a metal chip or a bent switch causes the alarm. Clean around the turret, ATC, and doors. 4. Summary Table of Common EX Alarms Alarm Code Description Typical Cause EX0069 Door lock time over Interlock solenoid or proximity switch failure. EX0095 Turret illegal movement Unclamp sensor failure or hydraulic pressure loss. EX1557 Coolant flow too low Clogged filter, low coolant, or faulty flow switch. EX4004 Please close the door Safety interlock preventing spindle rotation. EX3402 Spindle cooler flow off Low oil level in cooler or pump failure. Check for external fluid leaks
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
The tailstock body or quill is in an unsafe zone relative to the turret, or the tailstock pressure is inadequate.
| Alarm Code | Description | Probable Cause & Solution | | :--- | :--- | :--- | | | Turret Index Time Over | The turret could not reach the commanded position within the allowed time. • Stalled Motor: Check for mechanical jamming. • Sensor Issues: The turret may have physically locked, but the sensor didn't trigger. Clean the proximity switches. | | E110 | Turret Clamp Alarm | The turret failed to lock into position. • Check the "Turret Lock" proximity switch. • Check hydraulic pressure (if hydraulically clamped). • Mechanical debris between curvic coupling. | | E200 | Tool Post Overload | The live tooling motor (if equipped) or turret drive overloaded. • Check for seized bearings in the tool holder. • Reduce cutting forces. |
| Alarm Code | Probable Cause | Immediate Action | | :--- | :--- | :--- | | | Spindle drawbar unclamp fault | Check drawbar travel sensor. Air pressure to unclamp cylinder. | | EX1312 | Spindle orientation failure | M19 not completed. Check spindle encoder belt. | | EX1320 | Low chuck hydraulic pressure (front) | Adjust regulator on hydraulic power pack to 20-25 bar (depending on chuck size). | • Check the hydraulic oil level (is it low
If the alarm does not clear, perform a standard machine power cycle (Power Off, wait 30 seconds, Power On).
This guide to the Mori Seiki EX alarm list serves as a comprehensive technical reference, intended to be used alongside official machine documentation for accurate troubleshooting.
The turret failed to rotate and lock into the next tool position within the allowed time.
The parts catcher arm did not fully retract to its home position, posing a crash hazard for the turret tools. 4. Turret and Tool Changer (ATC) Alarms
: Indicates an issue with the mill spindle drive or amplifier.