Motor Fault — High Vibration Alarm
What This Fault Means
A high vibration alarm from a vibration sensor or PLC monitoring point indicates the motor or driven equipment is exceeding acceptable vibration levels (typically >7.1 mm/s RMS per ISO 10816).
Common Causes
- Shaft misalignment between motor and driven equipment
- Unbalanced rotating element (impeller, coupling, fan)
- Worn or failed bearings (inner/outer race defect)
- Loose mounting bolts or soft foot condition
- Resonance at operating speed
Recommended Fix
- Take vibration readings in horizontal, vertical, and axial directions at both bearings.
- Check mounting bolt torque and shim for soft foot.
- Laser-align the motor to the driven equipment.
- If bearing defect frequencies are present, plan a bearing replacement.
- For imbalance, have the rotating element dynamically balanced.
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