7902 Hot! — Siemens Drive Fault Code

If the motor spins but the drive still reports a 7902 fault, the PI controller may be too slow to respond, allowing the motor to lag behind the setpoint.

: Acceleration torque (increase to provide more starting torque). r0949r 0949 : Fault value (interprets the exact cause of the stall). To help narrow down the solution, could you tell me:

When Elias arrived, the massive machine stood silent, a sleeping giant. The control cabinet door was open, and Marcus was standing back, looking at the Siemens Sinamics S120 drive module like it was a bomb about to detonate. siemens drive fault code 7902

When facing an F07902 fault, follow this structured checklist to locate and resolve the issue. Step 1: Perform a Mechanical Inspection

: If this happens during an OFF/ON cycle, try activating the "Flying Restart" function (p1200=1). If the motor spins but the drive still

The load is too heavy, the machine is jammed, or the motor is physically unable to move.

is unequivocally a power delivery warning . In 95% of cases, the problem is external to the drive: a loose wire, a failing contactor, a damaged cable, or a motor winding opening. Only in about 5% of cases is the drive’s own output stage at fault. To help narrow down the solution, could you

If the drive is in closed-loop control (p1300 = 21) and the encoder signal is faulty, the drive may get conflicting data.

Set (Identify motor data at standstill) and give a run command to allow the drive to measure winding resistance and leakage inductance. This updates the internal mathematical model for better torque control. Conclusion

what does this code mean? It means the the drive thinks the motor has stalled. Please see parameters p1744, p1755 and p2178. Siemens SiePortal SINAMICS G120XA fault F07902 - ID: 109773411 - Support

Siemens drives do not rely solely on external sensors. They use internal 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.