Old Hand Fault Finder

Siemens SINAMICS G120 F07900: Drive: Motor blocked

What it means The motor ran at the torque limit below the speed threshold (p2175) for longer than the delay (p2177).

✓ Checked against the manual (Oct 2026): meaning and actions match the official fault table. Manual page.

Likely causes

  • Mechanically stuck load
  • Torque limit too low
  • Speed oscillating against the limit

Checks, in order

  1. Check that the motor can turn freely with power locked out
  2. Check the effective torque limit (r1538, r1539)
  3. Check p2175 and p2177

Old Hand tip

Check the brake release before anything else.

Source

Source (reworded, not copied): Siemens, SINAMICS G120 Control Units CU240B-2/CU240E-2 List Manual, 02/2023, A5E33839529, section 4.2 List of faults and alarms, PDF page 885. Official manual (PDF). Fault numbers and names can differ between firmware versions.