15
Use and installation instruction manual
ENGLISH
TABLE 1 - TROUBLESHOOTING
FAULT
POSSIBLE CAUSES
SOLUTIONS
10.1
The pump runs but does not
deliver
a) The internal parts are blocked by foreign bodies:
Disassemble the pump and clean.
b) Clogged suction pipe:
Clean the pipe.
c) Air inside the suction pipe
Check the watertight integrity of the entire pipe up to the pump
and waterproof it.
d) The pump is not primed:
Prime the pump.
Check the tightness of the foot valve.
e)
The suction pressure is too low and generally accompanied by
cavitation noises:
Too many pressure drops on the suction side or the suction height
is too high (check the NPSH of the installed pump).
f) Insufficient motor voltage:
Check the voltage of the motor terminals and the correct cross-
section of the conductors.
10.2
The pump vibrates
a)
Faulty anchoring to the surface:
Check and fully tighten the nuts of the stud bolts.
b) Foreign bodies obstruct the pump:
Disassemble the pump and clean.
c)
Obstructed pump rotation:
Check that the pump turns freely without any abnormal
resistances.
d) Faulty electrical connection:
Check the connections to the pump.
10.3
The motor
heats up abnormally
a)
Insufficient voltage:
Check the voltage at the motor terminals. The voltage must be ±
6% of the rated voltage.
b) Pump obstructed by foreign bodies:
Disassemble the pump and clean.
c) Room temperature exc40°C:
The motor is designed to operate at a maximum room temperature
of + 40°C.
d) Connection error in the terminal block:
Follow the instructions in the motor manual, refer to the
installation instructions.
10.4
Pump performance low
a)
The motor does not run at normal speed (foreign bodies or
faulty power supply, etc.):
Dismantle the pump and correct the anomaly.
b) Faulty motor:
Replace it.
c) Poor pump filling:
Repeat the pump filling procedure (chapter 7.1)
d) The motor turns in the wrong direction (three-phase motor):
Reverse the direction of rotation by crossing 2 phase wires at the
terminal block of the motor or the cut-out switch.
e)
The drain-priming plug or its insert are not screwed in
completely:
Check and screw it again.
f) Insufficient motor voltage:
Check the voltage to the motor terminals and the correct-cross
section of the conductors.
10.5
The circuit breaker trips
a) Thermal relay value too low:
Check the intensity with an ammeter or record the intensity value
according to the motor rating plate.
b) Voltage too low:
Check that the cross-section of the electrical cable conductors is
correct.
c) Phase down:
Check and replace the electric cable or fuse if required.
d) Faulty thermal relay:
Replace it.
10.6
The flow rate is not regular
a) The suction height is not observed:
Review the installation conditions and recommendations provided
in this manual.
b) The suction pipe diameter is smaller than that of the pump:
The suction pipe must have the same diameter as the pump
suction hole.
c) The strainer and the suction pipe are partially clogged.
Clean the suction pipe.
