Fault Finding - WAMGROUP WAMECO FIL.168-M.4L Mode D'emploi

WAMECO
N. EFFECT
FAN
Lack of capacity (with reduction in power
at normal rotational speed).
1
Excessive air capacity. (if rotational speed
1 is correct, high absorpition for radial fans
with curved blades aorwards).
2 Insufficient pressure.
Fall in performances after a satisfactory
3
operating period.
4 Difficult starting.
5 Absorbed power higher than plate data.
6 Air pulsations
7 Excessive noise
8 Vibrations
-

FAULT FINDING

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