The fan supplies less air than
expected.
Wrong choice of the fan.
Re-calculate the parameters and select the right fan.
Wrong direction of the impeller rotation
direction.
If necessary, change the impeller rotation direction by
changing the phase sequence on the electric motor
terminals. (see the “Commissioning” section).
Impeller contamination with foreign objects or
debris.
Clean the impeller from foreign objects or debris.
Increased noise, vibration in
the fan.
Loose screw connections.
Check the screw connections for proper tightness.
No vibration mounts on the fan.
Install the anti-vibration mounts.
Impeller contamination with foreign objects or
debris.
Clean the impeller from foreign objects or debris.
Worn bearings.
Replace the bearings.
Unstable power supply, unstable motor
operation.
Check the stability of power supply parameters and
electric motor operation.
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