Siemens alarm 300607: Axis %1 drive %2 current controller at limit
SINUMERIK 840D/810D powerline drive alarm (SIMODRIVE 611D) · SIMODRIVE 611D/611U
What it means
The demanded current setpoint cannot be forced into the motor even with maximum available voltage - per Siemens the classic signature of a phase missing or the motor not connected. Because full voltage with no current response also matches blown bridge hardware, treat it as an electrical-integrity alarm.
Likely causes
- phase missing: loose/blown motor fuse, open contactor pole, broken motor cable conductor
- DC link voltage absent (upstream infeed/precharge issue)
- Uce monitoring tripped inside power section (reset by power cycling)
- contact between control module and power section interrupted
- motor winding failure
Triage note: Check motor connection continuity phase-to-phase first; a power-cycle clears Uce latched states before condemning the module.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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6FX5002-… / 6FX6002-…
cable · Common cause
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6SN1123-…
power-module · Common cause
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6SN1118-…
control-board · Common cause
Need the part urgently?
Send us alarm 300607 with your machine details — typical RFQ turnaround is 24–48h.