Mitsubishi S01/S02 alarm: Mitsubishi servo alarm

Familia orientativa de fallos de servo/eje en controles Mitsubishi/MELDAS. It is an alarm from the Servo / ejes area, and in the catalog it is listed as “Mitsubishi servo alarm”. On the machine you notice it like this: The axis does not enable, Drive shows alarm, Fault when moving or homing.

On the shop floor it almost always comes from one of these causes: Amplificador servo, Cable de motor/encoder, Mechanical overload, Drive parameter/alarm. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset once the cause is resolved and with the axis in a safe state. Resetting without fixing the cause first only hides the problem: Mitsubishi S01/S02 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: Write down the complete code of the drive, Identify the axis, Check mechanical lock and safety. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Mitsubishi S01/S02 active, avoid this: Do not reset repeatedly if it comes back, Do not work on an energised amplifier. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If the drive shows a persistent alarm or the axis does not enable. 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. Mitsubishi requires complete CNC and drive code for reliable diagnosis.