Old Hand Fault Finder

Siemens SINAMICS G120 F30002: DC link voltage overvoltage

Cites the manual · line-by-line check pending

What it means DC link voltage went too high.

Likely causes

  • Regenerating load
  • Fast ramp-down
  • High line voltage

Checks, in order

  1. Lengthen ramp-down
  2. Enable Vdc max controller
  3. Add braking resistor

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.