11
Operation anomalies
Anomalies
Causes
Rimedies
Difficult start
Reduced supply voltage.
Insufficient motor static
torque.
Check motor plate data.
Close the air locks to
reach full speed if
necessary, replace
the motor.
Insufficient air flow.
Insufficient pressure
Clogged ducts and/or
suction points.
Clogged impeller.
Insufficient speed rotation
Ducts and suction point
cleaning.
Clean the impeller
Filter cleaning or
replacement.
Supply voltage check if
necessary, correct.
Performance drop
after a period of
acceptable
operation.
Circuit leak before and/or
after the fan.
Damaged impeller.
Circu it check and
restoration of original
conditions.
Check the impeller, if
necessary.
Replace through an
original spare part.
Air pulsation
The fan capacity
conditions are close to
zero - flow instability.
Clogging or wrong
connection.
Insufficient vo ltage from
the speed -regulator
Increase the min. speed
on the electronic
speed -regulator.
Modify the circuit and/or
replace the fan.
Clean and/or restore
the suction duct.
Excessive vibrations.
Rotating parts unbalance.
Check the impeller
balance - in case,
restore or replace it.
Through an original
spare -part.
Belt galling.
Anomalous scrubbing on
the pulley.
Previous lack of
maintenance
Belt substitution pulley
alignment.
