A loose connection or failing contactor in the output side.
For specialty motors (such as permanent magnet synchronous motors, third-party servomotors, or highly specialized induction motors), standard auto-calculation parameters may fail. siemens drive fault code 7902
During commissioning, if the motor nameplate data (current, power, speed, torque) was entered incorrectly, the drive’s internal mathematical model will miscalculate a stall condition. A loose connection or failing contactor in the output side
Adjust the drive’s dynamics to match the physical load capabilities. Increase Ramp-Up Time ( p1120p 1120 or highly specialized induction motors)