Old Hand Fault Finder

Siemens SINAMICS G120 F30001: Power unit: Overcurrent

Cites the manual · line-by-line check pending

What it means The power unit saw too much current.

Likely causes

  • Short or ground fault on output
  • Accel too fast
  • Wrong motor data

Checks, in order

  1. Megger motor and cable
  2. Check ramp-up
  3. Recheck motor data/commissioning

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. Official manual (PDF). Fault numbers and names can differ between firmware versions.