Siemens Drive Fault Code 7902

If you see , your drive has been "orphaned." It thinks the controller (PLC) has abandoned it. 95% of the time, this is a broken cable, a loose connector, or the PLC being stopped.

Fault code 7902 in Siemens drives typically indicates a specific issue related to the drive's operation. The exact meaning can vary slightly depending on the specific model and version of the Siemens drive. However, generally, this code points to a problem that requires attention to prevent further issues or damage to the drive and connected equipment.

Troubleshooting Siemens Drive Fault Code F07902: Causes and Solutions siemens drive fault code 7902

: Motor data identification and rotating measurements (static optimization) were not performed or completed.

If the motor data identification (p1910 / p1960) was not performed, the internal motor model may be inaccurate. The drive might calculate a speed that does not match reality, leading to a false positive stall alarm. This is especially common when commissioning third-party motors without performing a rotating measurement. If you see , your drive has been "orphaned

: Double-check the following parameters against the actual motor nameplate: (Rated voltage) (Rated current) (Rated power) (Rated speed)

Ensure match the motor nameplate precisely. The exact meaning can vary slightly depending on

This fault is usually —meaning the drive will not restart automatically. It requires a manual reset after the root cause is fixed.