Troubleshooting Table - E-Tech EH 3 Betriebs- Und Installationshandbuch

Operating and installation manual
8 DISPOSAL
Disposal of this product or parts of it must be carried out using the local public or
private waste disposal systems.
9 TROUBLESHOOTING
WARNING: Before any repairs to the electric pump, check that the power
supply is disconnected and that it cannot be accidentally reconnected
during maintenance operations.
WARNING: If the electric pump is used for hot and/or hazardous liquids, it is
essential to inform the personnel who will carry out the repair. In this case,
clean the pump so as to ensure the safety of the operator.
For problems and solutions,

"TROUBLESHOOTING TABLE"

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
consult table below:
TROUBLESHOOTING TABLE:
CAUSE
a) The internal parts are obstructed by foreign bodies:
b) Inlet pipe is blocked:
c) Air is entering the inlet pipe:
d) The pump is unprimed:
e) Inlet pressure is too low and generally accompanied by
cavitation noise:
f) Voltage insufficient to power the motor:
a) Anchorage on a faulty base:
b) Foreign bodies obstructing the pump:
c) Obstruction to the pump rotation:
d) Faulty electrical connection:
a) Insufficient voltage:
b) Pump blocked by foreign bodies:
c) Ambient temperature more 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.)
b) The motor is faulty:
c) The pump is not filling properly:
d) The motor rotates in reverse (three-phase motor):
e) Voltage insufficient to power the motor:
a) Thermal overload relay value too low:
b) Voltage is too low:
c) Interruption of one phase:
d) The thermal overload relay relay is faulty:
a) The inlet height is not being observed:
b) The inlet piping has a smaller diameter than the pump:
c) The suction filter and inlet piping are partially blocked:
ACTION
Dismantle the pump and clean it.
Clean the pipe.
Check that the pipe is airtight right up to the pump and seal it.
Re-prime it by filling the pump. Check that the base valve is
airtight.
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 conductors.
Check and fully tighten the nuts on the bolts of the studs.
Dismantle the pump and clean it.
Check that the pump can rotate freely without any abnormal
resistance.
Check the pump connections.
Check the voltage of the motor terminals. The voltage should
be ± 10% of the rated voltage.
Dismantle the pump and clean it.
The motor is designed to function at a maximum ambient
temperature of +40°C.
Check that the connections respect the diagram shown inside
the cover of the terminal box and the data plate information.
Dismantle the pump and correct the problem.
Replace it.
Repeat the priming operation.
Invert the direction of rotation by exchanging two phase wires
on the motor terminal board or the electrical control panel.
Check the voltage of the motor terminals and the correct
diameter of the conductors.
Control the intensity with an ammeter, set the value of the
intensity shown on the motor rating plate.
Check that the diameter of the conductors of the electric cable
is correct.
Check the electric cable or fuse and replace if necessary.
Replace it.
Check the installation conditions and the recommendations of
this manual.
The inlet piping should have the same diameter as the inlet
mouth.
Clean the inlet duct.
ENGLISH
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