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Idiomas disponibles
Idiomas disponibles
Operating and installation manual
7.1 Replacing the motor
For all versions of the pump with motor of rated power less or equal to 4kW, first
remove the coupling safety casings to access the motor clamping screws (see fig.20).
For all other versions, the motor clamping screws are easily accessible.
For all other versions, the motor clamping screws are easily accessible on the exterior
(see fig.19). The motor shaft must have a key drive.
Note: It is not necessary to carry out any operations on the pump shaft
and motor shaft connection joints.
WARNING: Replace the safety casings where necessary; failure to observe
these instructions may cause personal injury.
7.2 Replacing the mechanical seal
The type of mechanical seal can be identified from the pump Identification Code point
4.1 and from fig.14.
For the models with motor power less or equal to 4kW, follow the instructions in fig. 11;
for motor power bigger than 4kW, instructions in fig.12
8 DISPOSAL
The disposal of this product, or part thereof, must be executed using local public or
private waste collection.
PROBLEM
9.1
The pump turns but does
not deliver
9.2
The pump vibrates
9.3
The motor heats up
abnormally
9.4
The pump does not deliver
sufficient pressure
9.5
The automatic circuit
breaker trips
9.6
The flow is not regular
TROUBLESHOOTING TABLE:
CAUSE
a)
The internal parts are obstructed by foreign bodies:
Suction pipe is blocked:
b)
Air is entering the suction pipe:
c)
The pump is unprimed:
d)
e)
The suction pressure is too low and generally
accompanied by cavitation noise:
Voltage is insufficient to power the motor:
f)
a)
Anchorage on a faulty base:
b)
Foreign bodies obstructing the pump:
c)
Obstruction in the pump rotation:
d) Faulty electrical connection:
a) Insufficient voltage:
b)
Pump blocked by foreign bodies:
c)
Ambient temperature higher than +40°C:
d) Connection error in the terminal board:
a)
The motor is not rotating at normal speed (foreign bodies
or faulty power supply etc.):
The motor is faulty:
b)
Pump is not filling properly:
c)
d) The motor rotates in reverse (three-phase motor):
e)
The discharge-priming cap is not fully screwed on:
f)
Voltage is insufficient to power the motor:
a) Relay value too low:
b)
Voltage is too low:
c)
Interruption of a phase:
d)
The relay is faulty:
a) The suction height is not being observed:
b)
The suction piping has a diameter smaller than that of the The suction piping should have the same diameter as the
pump:
The filter and the suction piping are partially blocked:
c)
9 TROUBLESHOOTING
WARNING: Before any repairs to the electric pump, check that the power
supply is disconnected and that it cannot be accidently reconnected during
maintenance operations.
WARNING: If the electric pump is used for hazardous liquids, inform the
personnel who will carry out the repair. In this case, clean the pump so as to
guarantee the safety of the operator.
For problems and solutions, consult also table below:
TROUBLESHOOTING TABLE
ACTION
Have the pump dismantled and
cleaned. Clean the pipe.
Check that the pipe is airtight right up to the pump and
seal.
Re-prime it by filling the pump. Check that the base valve
is air tight.
Excessive loss of head in suction or the suction height
is excessive (check the NPSH of the installed pump).
Check the voltage of the motor terminals and the
correct diameter of the connections.
Check and fully tighten the nuts on the bolts of the
studs. Have the pump disassembled and cleaned.
Check that the pump can rotate freely without any
abnormal resistance.
Check the pump connections.
Check the voltage at the motor terminals. The voltage
should be ± 10% of the rated voltage (± 6% si 60 Hz).
Have the pump dismantled and cleaned.
The motor is designed to function at a maximum
ambient temperature of + 40°C.
d) Connection error in the terminal board: Follow
the instructions on the motor plate and FIG. 4
Have the pump dismantled and correct the problem.
Replace it.
Open the bleed valve of the pump and bleed until all
air bubbles disappear.
Invert the rotation direction by exchanging two phase wires
on the motor terminal board or the motor protection breaker.
Check it and tighten it
Check the voltage of the motor terminals and the
correct diameter of the connections.
Check the intensity with an ammeter or record the
intensity value indicated on the motor plate.
Check that the diameter of the conductors of the
electrical cable is the right one.
Check the electrical cable or fuse and replace, if
necessary,. Replace it.
Check the installation conditions and the
recommendations contained in this manual.
pump suction mouth.
Clean the suction duct.
ENGLISH
35
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