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Malfunction
8.1
Motor does not work upon start-up.
8.2
Thermal protector trips at time of
start-up.
8.3
The thermal protector of the motor
starter trips occasionally.
8.4
The capacity is not constant.
8.5
The pump turns but does not supply
water.
8.6
The pump vibrates.
Cause
a)
Lack of electric power supply.
b)
Burnt fuses.
c)
Thermal protector triggered.
d)
Faulty motor.
a)
Thermal
protector
malfunction.
b)
Faulty cable connection.
c)
Faulty motor winding.
d)
Mechanical
blocking
pump.
e)
Calibration of thermal overload
relay too low.
a)
Calibration of thermal overload
relay too low.
b)
Low voltage during peaks.
a)
Suction
pressure
(cavitation).
b)
Suction manifold / pump partially
obstructed by impurities.
c)
The pump takes in air.
a)
Suction manifold / pump partially
obstructed by impurities.
b)
Base and check valve locked in
closed position.
c)
Leak in the suction manifold.
d)
Presence of air in the suction
manifold or in the pump.
e)
Motor
turns
in
direction.
a)
Anchoring on faulty base.
b)
Foreign bodies obstruct the
pump.
c)
"Laboured" rotation of the pump. Check that the pump turns
d)
Faulty electrical connection.
Solution
Connect electric power supply.
Change fuses.
Reset thermal protector.
Replace motor.
contacts
Replace the contacts of the
motor starter.
Clamp or replace cables.
Replace motor.
of
the
Eliminate
block of the pump.
Calibrate the motor starter
correctly.
Calibrate the motor starter
correctly.
Check electrical power supply.
too
low
Check NPSH of the pump.
Clean
pump
manifold.
Check suction conditions.
Clean
pump
manifold.
Repair the base or check
valve.
Repair the suction manifold.
Check suction conditions.
the
wrong
Change the rotation direction
of the motor.
Check and fully lighten the
nuts of the stud bolts
Have the pump dismantled
and clean it.
freely
without
resistance.
Check the pump connections.
the
mechanical
or
suction
or
suction
abnormal
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