If the hardware is sound, the fault is likely a tuning issue:
For detailed parameter lists and specific drive models, you can refer to the Siemens SiePortal Support F7902 Technical FAQ specific parameter numbers for a particular Siemens drive series, such as the SINAMICS G120 siemens drive fault code 7902
If you must run a rotating identification ( p1910 = 2 ), uncouple the motor from the gearbox or mechanical load if possible. High load inertia or static friction during a tuning cycle will cause the identification algorithm to fail, generating an F7902 error. If the hardware is sound, the fault is
A classic mistake occurs when a motor is wired for a Delta ( Δcap delta Verify U-V-W connections for the motor
Connect to the drive using Siemens Starter, Startdrive, or the BOP-2/AOP30 operator panel.
Verify U-V-W connections for the motor.