Siemens Drive Fault Code 7902 ((better)) (Desktop QUICK)

In specific applications where a stall is expected during normal operation (e.g., torque control mode or holding a load against a stop), the 7902 fault may be nuisance.

. This typically occurs when the drive loses synchronism with the motor, meaning the motor is unable to rotate at the speed commanded by the inverter. Common Causes Missing Motor Data Identification

This report provides a comprehensive overview of the (F07902), often occurring in SINAMICS G120XA, G120, and S120 drives. 1. What is Fault F07902? siemens drive fault code 7902

Troubleshooting Siemens Drive Fault Code 7902: Motor Stalled (F07902)

Before changing parameters, restore the converter to its factory settings to remove any incorrect configurations (using a BOP-2, IOP-2, or Smart Access Module). 2. Enter Quick Commissioning Set the drive to quick commission ( p10 = 1 ). 3. Set Motor Data (Crucial Step) In specific applications where a stall is expected

: Motor excitation time (increase if fault occurs immediately at start). p1610p 1610

If the drive detects that the measured values deviate radically from the mathematical model expected based on the entered nameplate parameters, or if the current cannot flow correctly, it aborts the test and throws F7902. Common Causes Missing Motor Data Identification This report

Mechanically disconnect the motor from the driven equipment. Run the motor uncoupled. If the fault disappears, the problem is a mechanical overload or a seized component in your machine. If the fault persists with the motor uncoupled, the issue lies with the drive, motor, or parameterization.

If using Vector Control, consider adjusting the changeover speed threshold between the open-loop and closed-loop model zones to stabilize low-speed torque calculation. Prevention and Long-Term Reliability

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

It is important to differentiate this from . While similar, F07902 generally occurs when the motor enters a current limit situation above a specific speed threshold. Common Symptoms