Lowara e-LINE Serie Manual De Instalación, Uso Y Mantenimiento página 24

en - Original instructions
7 Troubleshooting
Precautions
WARNING:
 Faults must be corrected by a technician
possessing the technical-professional
requirements outlined in the current
regulations
 Observe the safety requirements in the
chapters on Use and Operation and
Maintenance
 If a fault cannot be corrected or is not
mentioned, contact Xylem or the
Authorised Distributor.
7.1 The pump unit is turned on but does
not work
Cause
Power supply cut off
The thermal overload
protection of the motor has
been triggered
The device that detects
the absence of liquid or
minimum pressure has
been triggered
Power supply cable is
damaged
The condenser is faulty, if
present
Control panel faulty
Motor (coil) faulty
7.2 The differential protection device
(RCD) is activated
Cause
Motor leaking
Unsuitable type of
differential
7.3 The thermal overload protection of
the motor is triggered when the
pump unit starts
Cause
It is calibrated at a value too low
in relation to the rated current of
the motor
24
Remedy
Restore the power supply
Reset the thermal
overload protection in the
control panel or the one in
the pump unit
Top up the liquid or
restore minimum pressure
Replace the power supply
cable
Replace the condenser
Check and repair or
replace the control panel
Check and repair or
replace the motor
Remedy
Check and repair or replace
the motor
Check the type of differential
Remedy
Recalibrate
Missing power supply phase
Loose and/or faulty connections
of the thermal overload
protection
Loose and/or incorrect and/or
faulty (star-delta) connections in
the terminal board of the motor
Motor (coil) faulty
Pump unit mechanically seized
up
Power supply cable is damaged
Check valve faulty
Foot check valve faulty
Flap valve damaged, worn or
faulty (models LNTE and LNTS)
7.4 The thermal overload protection of
the motor is triggered occasionally,
or after the pump unit has been
running for a few minutes
Cause
It is calibrated at a value
too low in relation to the
rated current of the motor
Input voltage outside the
rated limits
Unbalanced input voltage
Incorrect working curve
(flow rate greater than the
maximum permitted flow
rate)
Liquid too dense,
presence of solid or
fibrous substances (pump
unit overloaded)
Room temperature too
high, exposure to sunlight
Pump unit faulty
Check the power
supply and restore
the phase
Tighten or replace
the clamps and
terminals
Tighten or replace
the clamps and
terminals
Check and repair or
replace the motor
Check and repair
the pump unit
Replace the power
supply cable
Replace the check
valve
Replace the foot
valve
Replace the flap
valve
Remedy
Recalibrate
Make sure the voltage
values are correct
Make sure the voltage of
the three phases is
balanced
Reduce the required flow
rate
 Reduce the density of
the liquid and/or
 Remove the solid
substances and/or
 Increase the size of the
motor
 Lower the temperature
at the point of the
thermal overload
protection and/or
 Protect against direct
sunlight
Send the pump unit to an
authorised workshop for
testing