In applications where the motor is still spinning when the drive starts (like a fan), a lack of the "Flying Restart" function ( p1200 ) can cause F07902. Troubleshooting Steps
A motor stall fault rarely points to just one component. It can be caused by mechanical failures, incorrect drive parameters, or electrical issues. 1. Mechanical Blockage or Overload
: Ensure the motor is not physically blocked or overloaded. siemens drive fault code 7902
Subject: G120XA solution to warning F7902 motor out of step - Siemens
The physical configuration of the motor terminals creates an electrical impedance the drive cannot reconcile. In applications where the motor is still spinning
Check r61 (Position) and r63 (Speed) while running. If necessary, change the rotation direction with p1821=1 . C. Mechanical Check
Parameter thresholds for stall detection are set too tightly for the application. Check r61 (Position) and r63 (Speed) while running
Update the corresponding drive parameter to accurately reflect this topology. 3. Inspect the Physical Motor and Cable Integrity
Yes, by setting p0600 = 0 (disable temperature monitoring). However, this removes overtemperature protection – .
Jams in conveyors, pumps, mixers, or gearboxes physically lock the rotor.
Give the drive a run command to allow it to measure winding resistance and leakage inductance.