Datasheet

ENGLISH
be drained before opening it.
MAKING THE MACHINE SAFE
Fromnowon,“makingthemachinesafe”entailsthefollowingoperations:
• Makesurethemachineisdisconnectedfromallpowersupplies
• Makesureallmovingpartshavecometoafullstop
• Waituntiltheinternalandexternaltemperatureofthemachinehasreachedavaluewhichisnottoohottothetouch
• Providesuitablelightingfortheareaaroundthemachine(bygivingtheoperatorselectricallights,ifnecessary)
• Mechanicallylockupallmovingparts.
For any operation to be carried out on the machine (maintenance and cleaning), the operators must wear the required personal
protective equipment (PPE).
8. DISPOSAL
Whenthefanreachestheendofitslife,thefinaluserorwhoeveractsonhisbehalfmustcorrectlydisposeofit.Thisoperation
requires some important operations to be carried out:
• separatetheelectricalcomponentsfromthemechanicalcomponents
• drainthelubricants
• separatedifferentmaterialssuchasplastics,steel,copperetc.
All materials must be separately disposed of
Dispose of the materials in special recycling areas; do not litter the environment.
9. OPERATING PROBLEMS
Bearinmindthat,ifanaeraulicsystemisnotworking,theremaybemorethanonecause.Allcausesmustbeidentifiedand
systematically removed.
Some possible faults, causes and solutions for aeraulic systems:
9.1 Difficultstartup Reduced power voltage.
Motor start-up torque too low.
Unsuitable fuses for the start-up conditions.
Unsuitable assessment of the fan inertia
and of the coupling components.
Too much power drawn.
Check the motor nameplate data
Close the shutters until full speed is reached
(does not apply to axial fans). If this is case,
replace the motor with a more powerful motor.
Replace.
Work out again the inertial momentum and, if
needsbe,fitanewmotoronthefan.
See 9.2
9.2 Power input higher that
the value shown on the
identificationlabeland/
or the motor nameplate.
Rotation speed too high.
Air density higher than the project data.
The fan works with excessive pressure.
The motor turns at a lower speed than its
normal rotating speed.
Replace the motor and/or the pulleys and/or
redesign the system.
As above.
Redesign the system or replace the type of fan.
Check the power voltage and, if needs be,
rectify it. Check that the winding is not defective
and, if so, repair or replace.
9 . 3 Airflowratetoolow.
At the nominal rotation
speed, the input power
is reduced, especially
for the centrifugal fans
with forward curved
blades or with radial
blades. The power
input is less affected for
centrifugal backward
blade fans.
Obstructed pipes and/or blocked up inlet
points.
Rotation speed too low.
Working pressure higher than the design
specifiedpressure.
Blocked up impeller.
Clean pipes and hoods, check shutter position.
Check power voltage and check motor con-
nections, check drive ratios; if needs be, rectify
it. Check that the belts do not slip; if they do,
restore their correct tension.
Design error; replace the motor and/or the
pulleys, replace and/or adapt the circuit.
Clean the impeller.
Pag. 20