Do NOT use compressed air at pressures > 30 psi to avoid impeller deformation.
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| Symptom | Possible Cause | Diagnostic Steps | corrective Action | |---------|----------------|-------------------|--------------------| | Fan does not start | Power supply absent / breaker tripped | 1. Verify breaker status 2. Measure voltage at VFD terminals | Reset breaker; replace faulty breaker | | Motor overload alarm | Over‑current due to blockage or low voltage | 1. Check inlet/outlet for obstruction 2. Measure line voltage | Clear blockage; verify supply voltage ≥ 415 V | | Excessive vibration | Imbalance, bearing wear, loose mounting | 1. Use vibration analyzer 2. Inspect mounting bolts | Re‑balance impeller or replace bearing | | Noise (squealing) | Bearing lubrication loss or mis‑alignment | 1. Listen for frequency pattern 2. Check bearing temperature | Re‑grease bearings or replace if worn | | Speed does not follow setpoint | VFD communication error (Modbus) | 1. Ping VFD IP address / check RS‑485 wiring 2. Verify baud rate | Repair wiring; re‑configure VFD | | Temperature > 85 °C | Insufficient cooling, ambient > 45 °C, dirty motor vents | 1. Inspect motor vents 2. Measure ambient temperature | Clean vents; install auxiliary cooling fan |
Key Test Values (reference for service techs): Do NOT use compressed air at pressures >
| Parameter | Normal Range | |-----------|--------------| | Motor Insulation Resistance | > 1 MΩ (megohm megger) | | Stator Current Unbalance | < 5 % | | Bearing Temperature | ≤ 80 °C (after 30 min run) | | VFD Input Voltage | 460 ± 10 % V |
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