Mori Seiki "EX" alarms are PLC-related messages that originate from the machine tool builder rather than the underlying CNC control (such as Fanuc or Mitsubishi). These alarms typically indicate mechanical, electrical, or sequence-related issues specific to the machine's peripheral hardware, such as the hydraulic unit, automatic tool changer (ATC), or door interlocks.
Attempted cycle start without the chuck being properly clamped. DOOR NOT CLOSED The machine door is open, preventing cycle initiation. EX0069 DOOR LOCK CHECK TIME OVER
Indicates a general failure on the operation panel or flat-panel, often requiring a hardware check. IMPROPER TURRET
Cycle start was attempted while the Edit Key switch was still in the ON position. CHUCK UNCLAMPED
Cycle start was activated before completing X and Z-axis zero returns after a machine lock cancel. EDITING SWITCH KEY IS ON
Below is a categorized list and troubleshooting guide for common Mori Seiki EX alarms. Common Mori Seiki EX Alarm Codes Alarm Code Description & Potential Cause NEED ZERO-RETURN
The turret moved without a command; often caused by a faulty output driver or clamp signal. PANEL ALARM
The hydraulic power unit reports a fault, such as low pressure or readiness failure. SENSORING TOOL IN SPINDLE
The turret station number is out of the parameter range set for the machine. MILL SPINDLE ALARM A fault in the milling spindle amplifier or drive unit. EX1001 HYDRAULIC UNIT ALARM
The door lock confirmation signal did not reach the control within the allotted time. TURRET ILLEGAL MOVEMENT