Code 7902 - Siemens Drive Fault

The motor is struggling to turn the mechanical load.

In the world of industrial automation, Siemens drives (such as the Sinamics S120, G120, G130, and S150 families) are renowned for their precision, durability, and advanced diagnostic capabilities. However, like any complex electromechanical system, they occasionally encounter faults that can bring production lines to a halt. One such fault that often perplexes maintenance engineers and technicians is . siemens drive fault code 7902

"Partner?" Marcus asked. "The press only has one main motor." The motor is struggling to turn the mechanical load

Manually rotate the motor (if safe) to ensure the load isn't seized or jammed. Verify Parameter Settings: One such fault that often perplexes maintenance engineers

| Step | Action | |------|--------| | 1 | Check (actual speed) — does it really exceed p2162? | | 2 | Verify p1082 (maximum speed) ≥ p2162 (overspeed threshold). | | 3 | Increase p2162 slightly (e.g., 1.1× p1082) if mechanical limits allow. | | 4 | Check encoder: cable shielding, terminal tightness, p0400 encoder type. | | 5 | Perform motor data identification (p1910 = 1) and speed controller optimization (p1960 = 1). | | 6 | Increase deceleration time p1121 to avoid regen overshoot. |

Tell me the exact Siemens drive model (e.g., SINAMICS G120 CU240E-2 ) and whether you have an encoder or are running in V/f or vector control.