Troubleshooting - FLOWTECH flowboost K.H Operation And Maintenance Manual

Troubleshooting

To fix problems related to electric pump operation, follow the instructions in the Table. If you do not have the
necessary knowledge and skills, contact qualified personnel.
FAULT POSSIBLE CAUSES
a) The internal parts are blocked
by foreign bodies:
b) Clogged suction pipe:
10.1 The
c) Air inside the suction pipe
pump runs
but does not
d) The pump is not primed:
deliver
e) The suction pressure is too low
and generally accompanied by
cavitation noises:
f) Insufficient motor voltage:
a) Faulty anchoring to the surface:
b) Foreign bodies obstruct the
10.2 The
pump:
pump
vibrates
c) Obstructed pump rotation:
d) Faulty electrical connection:
a) Insufficient voltage:
b) Pump obstructed by foreign
10.3 The
bodies:
motor
heats up
c) Room temperature exceeding
abnormally
+40°C:
d) Connection error in the terminal
block:
a) The motor does not run at
normal speed (foreign bodies or
faulty power supply, etc.):
10.4 The
b) Faulty motor:
pump does
not deliver
c) Poor pump filling:
the expected
d) The motor turns in the wrong
performance
direction (three-phase motor):
f) Insufficient motor voltage:
a) Thermal relay value too low:
10.5 The
b) Voltage too low:
circuit
breaker trips
c) Phase down:
d) Faulty thermal relay:
10.6 The a) The suction height has not been
flow rate is adhered to:
not regular
b) The suction pipe has a lower
diameter than that of the pump:
c) The strainer and the suction
pipe are partially clogged.
flowboost
K.H Pump Manual
SOLUTIONS
Disassemble the pump and clean.
Clean the pipe.
Check the watertight integrity of the entire pipe up to
the pump and waterproof it.
Fill and prime the pump. Check the watertight integrity
of the foot valve.
Too many pressure drops on the suction side or the
suction height is too high (check the NPSH of the
installed pump).
Check the voltage of the motor terminals and the
correct cross-section of the conductors.
Check and fully tighten the nuts of the stud bolts.
Disassemble the pump and clean.
Check that the pump turns freely without any abnormal
resistances.
Check the connections to the pump.
Check the voltage at the motor terminals. The voltage
must be ± 6% of the rated voltage.
Disassemble the pump and clean.
The motor is designed to operate at a maximum room
temperature of
+ 40°C.
Check that the connections comply with the diagram
shown inside on the terminal cover and the rating plate.
Dismantle the pump and correct the anomaly.
Replace it.
Repeat the priming operation.
Reverse the direction of rotation by crossing 2 phase
wires in the terminal block or the electric panel.
Check the voltage to the motor terminals and the
correct cross-section of the conductors.
Check the intensity with an ammeter, set the intensity
value indicated on the motor rating plate.
Check that the cross-section of the electrical cable
conductors is correct.
Check and replace the electric cable or fuse if required.
Replace it.
Review the installation conditions and
recommendations provided in this manual.
The suction pipe must have the same diameter as the
pump suction hole.
Clean the suction pipe.
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