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Locate the proximity switch, limit switch, or pressure sensor tied to the alarm description. Clean away stuck metal chips, wiping off oily sludge that can bridge magnetic sensors. 3. Utilize the Diagnostic Screen (NC Side)

The machine attempted to execute a command (like spindle start or automatic cycle) while the operator door was open.

: Spindle speed abnormalities, lubrication failures, or tailstock position errors. Environment & Maintenance

Generated by Mori Seiki’s ladder logic. These point to mechanical switches, sensors, fluids, and safety guard violations. They typically range from EX0000 to EX3000+ depending on the machine generation (e.g., NL, NLX, DuraTurn, NH, NV series). Common Mori Seiki EX Alarm List & Solutions

Last updated: 2025-10-01. Compatible with MAPPS IV, MAPPS V, and Celos 5.x. For Fanuc 31i-based Mori machines, EX alarms may appear as “USER ALARM” followed by a number – refer to the separate Fanuc PMC manual.

The safety switch mounted on the door frame is misaligned, dirty, or broken. The PLC detects a mismatch between the physical door state and the switch contacts.

Clean chips out of door tracks and wipe down all visible proximity switches. Hydraulic Units

– The spindle failed to reach its oriented stop position within the set time. EX1037/1038/1040: Overload Alarms

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.

Before diving into specific codes, use this structured four-step framework to safely diagnose and clear any external alarm on your Mori Seiki machine. Step 1: Check Diagnostics and PMC Signals

The maintenance switch used to bypass safety doors is turned ON during automatic operation.

These errors ensure that workholding is secure before the spindle spins or axes move.

Note: Alarm codes can vary slightly depending on the specific Mori Seiki model (e.g., NLX, NTX, DuraTurn, NHX) and the generation of the MAPPS/Fanuc control. Always consult your specific machine's ladder diagram and electrical manual for exact definitions. 1. Lubrication & Fluid Alarms (EX0001 – EX0099)