Siemens alarm 300502: Axis %1 drive %2 maximum current monitoring of phase current R (measuring circuit error phase R)
SINUMERIK 840D/810D powerline drive alarm (SIMODRIVE 611D) · SIMODRIVE 611D/611U
What it means
Overcurrent/current-measurement fault detected on phase R of the affected drive.
Likely causes
- phase-to-phase or phase-to-ground short in motor cable
- motor winding fault on the affected phase
- failed current sense/IGBT leg on power module
- loose motor terminal connection
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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6SN1123-…
SIMODRIVE 611D power module · Primary suspect
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motor per axis nameplate (1FT6/1FT7/1PM…)
motor · Common cause
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6FX5002-…
motor power cable · Common cause
Need the part urgently?
Send us alarm 300502 with your machine details — typical RFQ turnaround is 24–48h.