Siemens alarm F30011: Power unit: line phase failure
SINAMICS S120 Line Module fault · SINAMICS S120
What it means
Missing or heavily imbalanced line supply phase at the infeed (ALM/SLM/SML).
Likely causes
- blown input fuse (one phase)
- loose/torched input terminal
- line contactor single-phasing
- grid supply imbalance
Triage note: Check all three phases under load - a marginal connection can measure OK unloaded.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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input fuses per line module rating
line fuses · Primary suspect
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line contactor per cabinet design
main contactor · Common cause
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6SL3130-… (ALM) / 6SL3210-1SE… (SLM)
Line Module (terminal damage) · Check if others ruled out
Need the part urgently?
Send us alarm F30011 with your machine details — typical RFQ turnaround is 24–48h.