Siemens alarm F30005: Power unit: overload I2t
SINAMICS S120 drive fault · SINAMICS S120
What it means
Thermal I2t model of the power unit exceeded - sustained current above rated for too long.
Likely causes
- mechanical binding on axis (slides, ballscrew, gibs)
- counterbalance failure on vertical axes
- tool overload / blunt tool / excessive feeds
- drive undersized for duty cycle
- motor data mismatch causing overcurrent draw
Triage note: Symptom, not root cause in most cases: compare actual current (r0068/r0027) during the offending move against mechanics before buying hardware.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- Request a quote →
next-larger Motor Module (6SL3120-…) if chronically undersized
motor module (resizing) · Check if others ruled out
- Request a quote →
axis ballscrew/gib/way components
mechanics (root cause, not electronics) · Common cause
Need the part urgently?
Send us alarm F30005 with your machine details — typical RFQ turnaround is 24–48h.