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Mori Seiki Ex Alarm List Better -

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).

8. Safety & Emergency Alarms

  • Alarm: 9001 / EMERGENCY STOP

    • Description: E-Stop activated.
    • Typical causes: Operator pressed E-Stop, safety condition.
    • First-line actions: Resolve hazard, reset E-Stop, follow safe restart procedure.

  • Alarm: 9005 / SAFETY CIRCUIT FAULT

    • Description: Safety circuit integrity compromised.
    • Typical causes: Wiring fault, safety relay failure.
    • First-line actions: Do not operate machine until inspected; contact qualified technician.

2. Encoder / Feedback Alarms

  • Alarm: 2001 / FEEDBACK ERROR

    • Description: Position feedback inconsistent.
    • Typical causes: Encoder malfunction, loose cable, noise interference.
    • First-line actions: Inspect encoder connector, reseat cables, check shielding, run encoder diagnostics.

  • Alarm: 2005 / ABSOLUTE ENCODER ERROR

    • Description: Absolute encoder mismatch or initialization failure.
    • Typical causes: Battery/backup loss, absolute value reset, encoder failure.
    • First-line actions: Reinitialize encoder per manual, verify battery/back-up, contact service if persists.

How to read this list

  • Alarm code: standard numeric or alphanumeric identifier.
  • Description: concise label shown on the control.
  • Typical causes: common reasons the alarm appears.
  • First-line actions: safe, immediate checks and corrective steps for operators/maintenance.

2. EX1004 – CHUCK UNCLAMPED

Symptoms: Cannot start spindle, cannot run program. Troubleshooting:

  • Manually clamp chuck using foot pedal or M10.
  • Listen for hydraulic pump sound. No sound? Check hydraulic pressure gauge.
  • Check proximity sensors on cylinder (clamp/unclamp switches). Often chips block the sensor.
  • Override in diagnostics: PLC signal F14.0 (unclamp confirmation). If stuck at 0, replace sensor. Prevention: Clean chuck sensors daily. Use air blow before pallet change.

On older Fanuc-controlled Mori (M-series, L-series without MAPPS)

  • EX alarms are displayed as user-defined macros: EX1001 = #1000 input signal.
  • Use SYSTEM → PMCMNT → ALARM to view active EX alarm text.

Common specific alarms (examples and actions)

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. mori seiki ex alarm list

  • Alarm: Following error (axis X/Y/Z)
    Action: Stop program, clear alarm, check for mechanical obstructions, inspect axis slides/ballscrews, verify servo tuning and encoder connection, run single-axis jog test.
  • Alarm: Servo amplifier fault / Drive overcurrent
    Action: Remove load, inspect for shorted motor cables, check cutting parameters, verify cooling/ventilation, check drive LEDs and error logs.
  • Alarm: Spindle encoder error
    Action: Check encoder cable/connectors, inspect encoder feedback for contamination, attempt homing sequence, replace encoder if defective.
  • Alarm: Turret indexing fault
    Action: Verify turret lock/clamp sensors, cycle turret manually if safe, check hydraulic/pneumatic supply and pressure, inspect turret drive motor and brakes.
  • Alarm: Tool magazine/ATC fault
    Action: Check tool presence sensors, clear jams, inspect gripper and magazine motor, run ATC cycle in single-step mode.
  • Alarm: Emergency stop / safety circuit
    Action: Ensure E-stop and safety door switches are released, inspect safety relays and wiring, reset per safety procedures.
  • Alarm: Low DC bus / mains phase loss
    Action: Check incoming power, fuses, mains contactor, measure voltages, inspect power supply modules.
  • Alarm: Program memory / parameter error
    Action: Backup parameters, check for corrupted media (CF/SD), reload parameters from backup, update or re-flash firmware if needed.

1. EX1002 – TOOL LIFE OVER

Symptoms: Machine stops mid-cycle, message: "Tool life expired for Txx". Troubleshooting:

  • Go to OFFSET → TOOL LIFE or TOOL DATA.
  • Identify the worn tool (T code).
  • Replace the insert or tool.
  • Reset tool life counter: C-INPUT → set COUNT = 0 or RESET.
  • If using tool life management, execute M110 (skip life NC) temporarily. Prevention: Adjust life expectations based on actual machining data.