Clean the dust off the chiller radiator filters and check fluid levels. EX0355 / EX355: Chuck Unclamped / Clamp Error
Alarm: 4001 / SPINDLE OVERSPEED
Machining centers require precise pressure and lubrication levels to protect the spindle and ways.
Note: exact alarm codes vary by EX model and control type (Mori Seiki/OI-T/Oi-F/Oi-TF or later FANUC/Siemens variants). Use the machine’s alarm manual for exact code meanings. Below are representative examples and first-step actions.
Alarm: 1011 / OVERLOAD (SPINDLE/SERVO)
He peered into the gloom. There, wedged between the chain link and the guide rail, was a tiny, shattered ceramic chip from a broken milling insert. It was smaller than a grain of rice, but to a servo drive expecting perfect torque curves, it was a boulder. The machine hadn't crashed because Hiro had done anything wrong. It had crashed because a previous operator had ignored a dull tool, the insert had shattered, and the shrapnel had found a home in the magazine's heart.
Among these, are some of the most common. Understanding how to read, diagnose, and clear these alarms is critical to minimizing downtime and maintaining production efficiency. What is a Mori Seiki EX Alarm?
Alarm: 6005 / COOLANT PUMP ERROR
: Sudden drop in incoming air pressure.
A significant percentage of EX errors are caused by proximity switches covered in metal chips, oil scum, or cutting fluid. Wipe the face of the sensor clean and check if the diagnostic LED on the back of the sensor toggles when metal passes by. Step 4: Consult the Diagnostic / PMC Screen
I can provide targeted diagnostic steps and specific PMC parameters for your machine setup. Share public link
This document provides a systematic, easy-to-scan alarm list for Mori Seiki EX series CNC machines. It groups alarms by category, gives typical causes, and suggests first-line troubleshooting steps. Use this as a quick-reference; follow your machine’s manual and safety procedures for detailed diagnostics and repairs.
The cooling unit for the spindle is overheating or failing. mori seiki ex alarm list
: Excess heat detected in the electrical control unit; check filters and cooling fans. EX0560 - Air Pressure Low
: The incoming air pressure has dropped below the operational threshold. EX1047 - PMC Parameter Error
: A cycle start was attempted without completing the necessary X or Z-axis zero returns. EX0024 - Chuck Unclamped
Mori Seiki "EX" alarms are external PLC (Programmable Logic Controller) alarms generated by the machine's ladder logic rather than the core Fanuc or Mitsubishi NC system. These codes specifically monitor machine-side components like doors, sensors, and fluid levels. Clean the dust off the chiller radiator filters