In SINAMICS firmware versions (e.g., V4.7+), 7902 indicates that the has been interrupted or never established. The drive is configured for fieldbus control (e.g., P0700 = 6 for PROFIBUS, or P0922 telegram selected) but no valid cyclic data exchange is occurring.
Does the fault happen or while the machine is running at speed ? siemens drive fault code 7902
. This critical protection fault occurs when the drive detects that the difference between the set speed and actual speed has exceeded a defined tolerance for too long, often because the motor cannot generate enough torque to overcome the load. Siemens SiePortal 1. Primary Causes of F7902 Mechanical Overload: In SINAMICS firmware versions (e
Manually rotate the motor (if safe) to ensure the load isn't seized or jammed. Verify Parameter Settings: Primary Causes of F7902 Mechanical Overload: Manually rotate
G120XA solution to warning F7902 motor out of step - Siemens