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Page 11 of 14
SYMPTOMS
CAUSE
SOLUTIONS
SPEC
Reduced performance after
a period of correct function
Start up problems
Excessive noise
Leak in the fan casing seal
and/or leak in the inlet/outlet
ducts
Excess power absorption
Reduced power supply
tension
High number of rpms needed
to obtain the required
performance
Faulty bearings
Replace seal and check ducting.
Check rotation direction; check any
turbulence conditions in inlet; check
motor running speed, power supply
tension and winding problems.
Check data on the motor plate
Use soundproofing and/or silencers;
opt for a larger fan with equal
performance or a fan with a minor
peripheral speed
Check wear and tear on bearings
(especially sealed bearings)
2
2
2
2
2
Vibration
Poorly balanced impeller or
impeller knocking against the
casing
Poorly balanced rotating parts
Unsuitable base
Check impeller balance
Check balancing again
Add weights to the base to increase
stability
2
2
2