BETONPARTSDiagnosis sheet · https://betonparts.com/en/faults/electrical/hums/
Electrical and control system · Motors
Contactor pulls in, motor hums but does not turn
⚠ STOP the equipment until this is fixed.
- Symptom
- Contactor pulls in, motor hums but does not turn
- Likely cause
- One phase missing, mechanical jam, or low voltage.
- Check
- Measure all three phases; turn the machine by hand (locked out).
- Fix
- Restore the phase; free the load.
Manual · Book 8 · § 14.1
Parts you may need
⚠ Every look inside, turn by hand or open step means full lockout first. Never enter a silo or a bin with material in it.
Plant / site
Machine and serial no.
Date
Checked by
Findings and actions
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