Siemens Drive Fault Code: 7902

The Siemens drive fault code 7902 (specifically F07902) indicates that the motor has stalled. This fault occurs when the drive detects that the motor is no longer rotating as expected while under load or during acceleration. Primary Causes

He checked the DC link voltage. The capacitors in the line module were humming, charged and ready. But the second motor

Begin with verifying that the PLC master is actively exchanging cyclic data with the drive’s configured station address. Then check hardware integrity of the bus cable and termination. If the issue persists, match telegram settings exactly between the drive (P0922) and the master’s hardware configuration. siemens drive fault code 7902

If your SINAMICS drive just threw a "Motor Stalled" error, don't panic. Here is a rapid-fire checklist to get back up and running:

. 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 The Siemens drive fault code 7902 (specifically F07902

Conclusion

Siemens drive fault code 7902 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.

Incorrect Limit Settings: If the current limit (p0640) or torque limits are set too low for the application, the motor cannot pull enough power to move the load, triggering the stall fault. The capacitors in the line module were humming,

Are you using encoder feedback or is it in sensorless (V/f) control? sinamics drive motor fault 7902 - SiePortal - Siemens