2
01.10
FIL.168.--.M.4L
105
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WAMECO
®
N.
EFFECT
CAUSES
POSSIBLE REMEDIES
FAN
Lack of capacity (with reduction in power
at normal rotational speed).
Clogged pipings and/or obstructed suction points.
Clean pipings and hoods; check the position of
locks.
1
Insufficient rotational speed.
Check the power voltage and the connection of
motor terminals; check the gear ratio and that belts
do not slip.
Working pressure higher than design.
Design error. Replace motor and pulleys; replace
and/or adapt the circuit.
Clogged wheel.
Clean the wheel through the special door when the
machine is stopped.
Reversed rotation direction.
Check the connection of windings on motor
terminal board.
Overloaded filter.
Increase the operating frequency of the automatic
cleaning device (where foreseen) or operate
manually.
Suction vorticity in the same rotation direction as
the wheel.
Fit an anti-turbulence device (straightening blades).
Changes in section, sharp and close curves.
Check the layout of the air-water circuit.
Sudden expansions or curves not allowing the
normal reset of the inlet dynamic pressure.
Check the layout of the air-water circuit.
1
Excessive air capacity. (if rotational speed
is correct, high absorpition for radial fans
with curved blades aorwards).
Rotational speed
See 1)
Check the rotation direction; the particular
conditions of suction turbolence; rotational speed
in the a.c. motor; power voltage and winding faults.
Air leaks through access doors, pipings, wrong-
manufactured or wrong-installed components, or
bypass locks not closed properly
Check the system and replace the non-complying
components.
Excessive evaluation of circuit power losses
Close the locks or slow the speed down to the
desired performance
2
Insufficient pressure.
Too much low rotational speed.
See 1)
Capacity higher than design values because of an
error in the circuit dimensioning or of air
temperature significantly different from the 15 °C
reference value.
Replace the gasket and check the piping
conditions.
Wheel partially blocked and/or damaged.
Check the wheel assembly position and conditions.
Reversed rotation direction.
See 1)
3
Fall in performances after a satisfactory
operating period.
Leak in the gasket of the fan volute and/or leak in
the suction and pressing pipings.
Replace the gasket and check the piping
conditions.
4
Difficult starting.
Excessive power absorption.
See 2)
reduced power voltage.
Check the motor plate data.
Insufficient motor pick up torque.
Replace with a more powerful motor or, for radial
fans, close the locks until reaching full speed. This
is not valid for axial fans.
Fuses not suitable for actual needs.
Replace them.
Inadequate evaluation of the fan inertia and of the
fitting components.
Recalculate the moments of inertia and, if
necessary, equip the fan with a new motor drive.
5
Absorbed power higher than plate data.
High rotational speed so to require a higher power
than the installed one.
Replace motor and pulleys and/or redefine the
system.
Air density higher than design data.
See above.
6
Air pulsations
Capacity higher than design lebels for a pressure
lower than design value.
See above.
Axial fan working in the initial area of the
characteristic under stall conditions.
Redefine the system and/or replace the fan.
Centrifugal fans operating under conditions of zero
capacity.
See above.
Instability of the suction flow with presence of
vortex.
Redefine the inlet by the introduction of flaps.
Detachment of the fluid vein from the back of the
blade or the walls of a pipe.
Redefine the system and/or replace the fan.
7
Excessive noise
High number of revolution to get the required
performance.
Use soundproof boxes and/or silencers;choose a
bigger machine with the same performances or a
machine with lower rim speed.
Failure in bearings.
Check the wear of bearings (in particular the proof
ones) and lubrication.
Wheel unbalance and its sliding on the box.
Check the assembly positions of wheel and
pipings.
Eccentricity between rotor and stator.
Check the concetricity.
Vibrations in the winding.
Can be reduced with higher quality motors.
8
Vibrations
Unbalances in the rotating parts.
Recheck the balancing
Inadequate support structure (natural frequency
close to the one correspnding to the fan rotational
speed).
Alter the support adding some weight
FAULT FINDING
BETRIEBSSTÖRUNGEN UND ABHILFE
INCONVENIENTS ET SOLUTIONS
INCONVENIENTI E SOLUZIONI
Summary of Contents for WAM WAMECO FIL.168 M.4L Series
Page 113: ......
