Siemens Drive Fault Code 7902 ~repack~

: The default delay time for stall detection is too short for high-inertia loads. siemens drive fault 7902 - Click2Electro

The 7902 fault is rarely a hardware failure in the drive itself. Instead, it is typically related to improper motor parameterization or application issues:

Cross-check the motor nameplate against the drive parameters ( Perform Motor ID: Re-run the motor data identification ( siemens drive fault code 7902

Connect to the drive using Siemens software (such as STARTER, Startdrive, or the BOP-2/IOP-2 operator panels) to verify key parameters.

: Incorrect motor phase lead connections or disconnected motor cables. : The default delay time for stall detection

If the fault occurs when trying to start a motor that is already spinning (coasting), enable the "Flying Restart" function ( Adjust Fault Limits:

Use embedded motor temperature sensors (PT100/PTC) wired to the drive to catch overheating before a stall occurs. : Incorrect motor phase lead connections or disconnected

In technical terms, the drive’s internal motor model compares the expected motor speed (based on the setpoint) against the actual speed feedback (or an estimated value). If the deviation between what should be happening and what is happening exceeds a predefined threshold for a set amount of time, the drive shuts down and raises the F7902 fault to prevent damage to the mechanics, the motor, or the drive itself.

For SINAMICS G120XA drives experiencing frequent 7902 faults, Siemens recommends the following: