Siemens F30015 alarm: SINAMICS: phase failure in motor cable

The SINAMICS drive detects a phase imbalance on the motor output. It is an alarm from the Servo / ejes area, and in the catalog it is listed as “SINAMICS: phase failure in motor cable”. On the machine you notice it like this: The motor does not start or it vibrates, Drive trip, May appear when energising or under load.

On the shop floor it almost always comes from one of these causes: Motor cable with an open phase, Contactor de salida atascado, Motor winding damaged in one phase. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset only after phase repair. Resetting without fixing the cause first only hides the problem: Siemens F30015 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: Anotar F30015, Check the connectors with the drive powered off, Measure phase-to-phase resistance (service). That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Siemens F30015 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

Siempre. 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.