Primarily seen in SINAMICS S120 and G120/G120XA drives using Vector Control (VC) or Sensorless Vector Control (SLVC).
at start, or only when you add a load? sinamics drive motor fault 7902 - SiePortal - Siemens
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Verify and adjust the following parameters within your Siemens TIA Portal or Starter software:
This parameter sets the allowable speed difference between the setpoint and actual speed in rpm . Impact: This is primarily used in encoder-based vector control. If the encoder feedback jitters or lags, the deviation might exceed P1744 , triggering the fault.
A loose connection or failing contactor in the output side.
In closed-loop control modes, a damaged encoder, loose coupling, or broken feedback cable will feed incorrect speed data back to the inverter.
"Is it jammed?" his apprentice, Leo, asked, pointing at the massive hoist gears.
Lock out and tag out (LOTO) the drive following local safety protocols.
The load on the motor is significantly higher than its rated capacity, preventing it from reaching the set speed. Incorrect Motor Data:
: Inspect the connected machinery for jams, broken bearings, or excessive friction that could be stalling the shaft. Adjust Stall Protection Parameters
