By following a logical, step-by-step diagnostic process—visual inspection, continuity testing, megger testing, and swap tests—you can pinpoint the cause within an hour. Remember: do not simply reset the fault and restart. Find the physical root cause, or it will return, often with more severe damage (including a burnt motor or drive).
Lastly, document your findings. Keeping a log of recurring 7902 faults can reveal systemic issues like undersized cables, excessive vibration, or environmental contamination (dust, moisture) in the motor terminal box. Consult the official Siemens manual for your specific drive model (function diagrams 8010–8020 for output monitoring). For hands-on help, Siemens Technical Support can provide remote diagnostic assistance using Starter or STARTER software to trace current waveforms in real time. siemens drive fault code 7902
The official Siemens description: “Phase failure in the motor feeder cable.” Lastly, document your findings
This fault triggers the drive’s built-in monitoring function, which compares the current in all three phases (U, V, W) at the drive’s output. If the current in one phase falls below a specific threshold relative to the others, the drive assumes a cable break or motor winding failure and shuts down to prevent damage. Siemens drives do not rely solely on external sensors. They use internal current measurement at the inverter’s output stage. When the motor is running, the drive expects balanced currents. If one phase deviates by more than a programmable tolerance (typically set via parameter p3230 in Sinamics), the drive triggers fault 7902. For hands-on help, Siemens Technical Support can provide