Siemens Drive Fault Code 7902 Extra Quality -

The Siemens drive fault code indicates that motor has stalled or is out of step

4. Check for Electrical Noise

Step 3: Inspect Wiring

This fault triggers the drive’s built-in monitoring function, which compares the current in all three phases (U, V, W) at the drive’s output. If the current in one phase falls below a specific threshold relative to the others, the drive assumes a cable break or motor winding failure and shuts down to prevent damage. siemens drive fault code 7902

This fault indicates that the drive has stopped receiving valid cyclic process data telegrams from the higher-level controller (PLC) within the configured monitoring time. The Siemens drive fault code indicates that motor

  • Increase ramp-up/down times (p1120, p1121) to reduce peak current.
  • Lower pulse frequency (p1800) from default 4 kHz to 2 kHz if torque quality allows.
  • Extend thermal time constant (p0611) cautiously—only if motor intermittent duty cycle permits.
  1. Reduce load: Check mechanical binding, gearbox issues, or conveyor tension.
  2. Improve cooling: Clean motor fins, install external forced ventilation, or switch to a motor with higher IP rating or forced cooling (e.g., IC416).
  3. Adjust parameters:

    : The load on the motor exceeds its torque capability, physically preventing it from turning. Incorrect Parameter Settings Increase ramp-up/down times (p1120, p1121) to reduce peak

    Common Causes