By understanding what Siemens drive fault code 7902 indicates and following systematic troubleshooting steps, users can often quickly resolve issues and maintain the reliability and efficiency of their drive systems.
Low-speed, high-torque applications (hoists, mixers, extruders). P1745 is a percentage threshold. The default is 5.0% to 10.0% . If your load causes a larger model error, increase this value. siemens drive fault code 7902
If the motor isn't genuinely stalling but the drive thinks it is, you can adjust parameters to be less sensitive: Increase delay time: p2178p 2178 (Stall delay). Increase fault tolerance: p1745p 1745 . Specific Fix for G120XA By understanding what Siemens drive fault code 7902
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. The default is 5
The drive triggers this fault when the deviation between the calculated motor speed and the actual speed exceeds a specific threshold for a set amount of time. sinamics drive motor fault 7902 - SiePortal - Siemens
: Incorrectly set motor data (voltage, current, or frequency) or missing motor identification (ID) runs.
Trying to accelerate a high-inertia load too quickly. 3. Electrical Issues