Siemens — Drive Fault Code 7902

Here is the breakdown and common solutions for this fault.

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

A loose connection or failing contactor in the output side.

Ensure the current limit is high enough to allow the motor to break away from a standstill. Step 4: Motor Identification Run siemens drive fault code 7902

A critical note for troubleshooting: . If you are in V/f control ( P1300 = 0 ), the drive’s stall detection is largely inactive, and you will not see this code.

Yes, by setting p0600 = 0 (disable temperature monitoring). However, this removes overtemperature protection – .

However, a critical nuance often missed: In some Siemens drive firmware versions, can also indicate a wire break or short circuit in the temperature sensor feedback circuit , rather than actual overheating. This dual nature makes it a tricky fault to diagnose without systematic testing. Here is the breakdown and common solutions for this fault

To avoid recurring F07902 disruptions, implement these long-term maintenance strategies:

This comprehensive troubleshooting guide breaks down the core internal logic, primary physical causes, parameter mitigation strategies, and sequential resolutions for the F07902 fault code. Internal Diagnostic Logic: Why F07902 Triggers

. This happens when the drive determines that the motor's actual speed deviates from the setpoint for longer than the configured delay time. Siemens SiePortal Primary Causes and Remedies sinamics drive motor fault 7902 - SiePortal - Siemens Conclusion A loose connection or failing contactor in

If fault appears at start command:

If the motor was never commissioned with the drive, run a static identification (p1910 = 1) followed by a rotating measurement (p1960). This teaches the drive the exact electrical characteristics of the motor. Failure to do this is a primary cause of unexplained 7902 faults in sensorless vector control.