DMG Mori Maintenance and Troubleshooting Guide

DMG Mori machines use several control families, including the CELOS-integrated platforms and the older NC-based controls, and their alarm styles reflect that range. You will see alarm codes with an AL prefix, M-series codes, and plain numeric codes, depending on the model and control. This guide focuses on the parts of DMG Mori maintenance that are specific to the platform: how the alarm families are grouped, which subsystems tend to need attention, and where the official documentation lives. Intervals, pressures, and parameter values come from the DMG Mori manuals for your machine, not from this article.

Identify the Control and Model Family

Start by recording the machine model, the control type, and the software version. DMG Mori sells turning centers, milling machines, and multi-tasking machines, and the alarm numbering and diagnostic screens differ between them. A code that is clear on one model may not appear the same on another, so match every fault to the correct manual before acting on it.

How DMG Mori Alarm Codes Are Grouped

DMG Mori alarms are usually identified by a prefix and a number. The AL series covers a broad range of machine conditions, the M series covers many specific functions, and some controls report plain numeric codes. Use the prefix to narrow the subsystem involved, then confirm with the full message text. Our reference library includes many published DMG Mori codes, and the DMG Mori alarm codes index lists them all.

Axis Limit and Overtravel Alarms

Overtravel conditions are among the most common alarms on DMG Mori machines. DMG MORI Alarm AL190 reports an X-axis positive overtravel, and DMG MORI Alarm AL193 reports a Y-axis negative overtravel. Stroke limit alarms such as DMG MORI Alarm M5101, a Y-axis stroke limit, usually mean the axis has reached a configured boundary. Before moving the axis, confirm the position and the limit values against the machine documentation, and clear any collision risk first.

Spindle Drive and Orientation Faults

Spindle problems on these machines range from orientation to drive faults. DMG MORI Alarm AL013 reports a spindle orientation failure, DMG MORI Alarm AL051 covers a spindle drive fault, and DMG MORI Alarm AL053 reports a spindle bearing temperature condition. Check the spindle cooling and bearing temperature readings, and follow the spindle service procedure in the DMG Mori manual before restarting.

Cooling, Fans, and Coolant Systems

Thermal and fluid alarms are usually easier to prevent than to fix. DMG MORI Alarm AL202 covers a cooling fan failure, and DMG MORI Alarm AL091 reports a coolant level that is low. Keep fan filters clean, check the coolant level at the start of each shift, and confirm the fluid meets the specification in your machine documentation.

Pneumatic and Lubrication Systems

Air and lubrication faults can stop a machine before any axis moves. DMG Mori Alarm AL501 reports a pneumatic air pressure low condition, and DMG MORI Alarm N500 covers a lubrication system error. Confirm the air supply pressure and the lubricant level, and inspect lines and fittings for leaks. The required pressure and lubricant grade must be taken from the DMG Mori specification for your model.

Tool Magazine and Changer Alarms

Tool handling alarms often trace back to the magazine position or the tool data. DMG MORI Alarm N010 reports that a tool is not in the magazine, and DMG MORI Alarm W011 covers a pallet changer fault. Check the magazine contents against the tool table, confirm the tool data is current, and inspect the changer mechanism for debris before running a cycle.

Network and CELOS Communication

On machines with CELOS integration, some alarms relate to network or application communication rather than the machine itself. DMG MORI Alarm M5300 covers a CELOS network issue, and DMG Mori Alarm AL901 reports a network communication fault. Check the network cabling and the connection settings with your IT and machine documentation. Avoid changing network addresses without coordination.

Backups and Parameter Records

Save machine parameters, PLC files, tool data, and the programs in active use, and store copies off the machine. Record the control software version with each backup, since restoring a backup to a different version can cause problems. Verify a backup by reading it back before you depend on it for recovery.

Preventive Maintenance Routine

A practical daily routine checks coolant level, air pressure, lubrication, fan operation, and the alarm history since the last shift. Log what you find so recurring problems show up. Periodic service intervals, filter changes, and fluid replacement must follow the DMG Mori maintenance schedule for your machine, since these depend on the model and duty cycle.

Where to Find Official DMG Mori Documentation

DMG Mori publishes operator, maintenance, and parameter manuals for each machine model and control. Use the manual that matches your model and software version, because alarm text and parameter names change between platforms. Your DMG Mori service representative or authorized distributor can confirm model-specific details. The machine's alarm history screen gives the exact alarm prefix and number, which is the most reliable search key in the manual index.

Frequently Asked Questions

Which DMG Mori alarm codes are in the AxisMD library?

The library includes many published DMG Mori codes across AL, M, and numeric series, with more added as they are verified. Browse the DMG Mori alarm codes index for the current list.

Can I clear an overtravel alarm by jogging the axis away?

Be careful. Jog the axis only after confirming the position and the limit, and follow the DMG Mori procedure for overtravel recovery. Moving an axis into a limit or collision risk can cause serious damage.

How often should I service a DMG Mori machine?

Follow the maintenance schedule in the DMG Mori manual for your model. Intervals depend on the machine, the work it does, and the environment, so use the manufacturer's schedule rather than a fixed number from a general guide.