Old Hand Fault Finder

Siemens SINAMICS G120 F07901: Drive: Motor overspeed

What it means Motor speed went past the maximum allowed (speed limit p1082 plus hysteresis p2162).

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

Likely causes

  • Overhauling load pushing the motor
  • Speed limit or hysteresis set too tight

Checks, in order

  1. Check r1084 or r1087 and correct p1082 and p2162 if needed
  2. Consider speed-limit precontrol (p1401.7 = 1)

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.