Mitsubishi M01 0020 alarm: Excessive error during movement

Mitsubishi/MELDAS detects that the axis does not follow the commanded position during movement. It is an alarm from the Servo / ejes area, and in the catalog it is listed as “Excessive error during movement”. On the machine you notice it like this: The axis stops while moving, Noise or mechanical harshness, Alarm in a specific area.

On the shop floor it almost always comes from one of these causes: Mechanical jam, Dry guides, Encoder/cable, Ganancia servo incorrecta, Carga excesiva. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after removing the cause; if it returns, stop. Resetting without fixing the cause first only hides the problem: Mitsubishi M01 0020 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Identify the axis, Check lubrication and obstacles, Try a slow move only if it is safe. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Mitsubishi M01 0020 active, avoid this: Do not force the axis repeatedly, Do not raise servo limits to produce. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If it repeats or there is noise or a crash. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is critical: there is a real risk of damage to the machine, the tool or a person. Leave the machine stopped, do not keep resetting it to see if it goes away, and call maintenance before producing again. Guidance reference. Always confirm the full text in the exact machine/control manual.