Old Hand Fault Finder

Siemens SINAMICS G120 F30021: Ground fault

Cites the manual · line-by-line check pending

What it means Ground fault detected on the output.

Likely causes

  • Insulation failure in motor or cable

Checks, in order

  1. Megger motor and cable

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.