Siemens alarm 300512: Axis %1 drive %2 direct feedback recognized
SINUMERIK 840D/810D powerline drive alarm (SIMODRIVE 611D) · SIMODRIVE 611D/611U
What it means
At ramp-up the drive compared the true rotor position against the position information delivered by the motor encoder and found a deviation above 45 degrees electrical. This flags local contamination of the encoder or a loose/shifted encoder mounting - resuming operation without repair risks uncontrollable movement.
Likely causes
- contaminated encoder disc/scale (oil mist, swarf)
- encoder tape/disk slipped or loosely mounted coupling
- encoder cable/shield disturbance mimicking position shift
- encoder replaced without re-running commissioning identification
Triage note: Safety-relevant: correct the cause and re-commission before re-enabling the axis.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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per fitted encoder
encoder · Common cause
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6FX2002-…
cable · Check if others ruled out
Need the part urgently?
Send us alarm 300512 with your machine details — typical RFQ turnaround is 24–48h.