Lowara SV-B Serie Montage, Betrieb Und Wartung Seite 19

Cause
There are foreign objects (solids or fi-
brous substances) inside the pump
which have jammed the impeller.
The pump is overloaded because it is
pumping liquid that is too dense and
viscous.
The pump runs but delivers too little or no water.
Cause Remedy
The pump is clogged. Contact the Sales and Service Department.
The troubleshooting instructions in the tables below are for installers only.
7.2 The main switch is on, but the electric
pump does not start
Cause
There is no power supply.
The thermal protector incorpora-
ted in the pump (if any) has trip-
ped.
The thermal relay or motor pro-
tector in the electric control panel
has tripped.
The protective device against dry
running has tripped.
The fuses for the pump or auxili-
ary circuits are blown.
7.3 The electric pump starts, but the
thermal protector trips or the fuses blow
immediately after
Cause
The power supply cable is dam-
aged.
The thermal protection or fuses
are not suited for the motor cur-
rent.
The electric motor is short cir-
cuit.
The motor overloads.
7.4 The electric pump starts, but the
thermal protector trips or the fuses blow a
short time after
Cause
The electrical panel is situated in an ex-
cessively heated area or is exposed to di-
rect sunlight.
The power supply voltage is not within
the working limits of the motor.
A power phase is missing.
7.5 The electric pump starts, but the
thermal protector trips a varying time after
Cause
There are foreign objects (solids or
fibrous substances) inside the
pump which have jammed the im-
peller.
e-SV - English
Remedy
Contact the Sales and Service De-
partment.
Check the actual power require-
ments based on the characteristics
of the pumped liquid and then con-
tact the Sales and Service Depart-
ment.
Remedy
• Restore the power supply.
• Make sure all electrical connections
to the power supply are intact.
Wait until the pump has cooled down.
The thermal protector will automatically
reset.
Reset the thermal protection.
Check the:
• water level in the tank, or the mains
pressure
• protective device and its connecting
cables
Replace the fuses.
Remedy
Check the cable and replace as necessa-
ry.
Check the components and replace as
necessary.
Check the components and replace as
necessary.
Check the operating conditions of the
pump and reset the protection.
Remedy
Protect the electrical panel from
heat source and direct sunlight.
Check the operating conditions of
the motor.
Check the
• power supply
• electrical connection
Remedy
Contact the Sales and Service Depart-
ment.
en - Translation of the original instructions
Cause
The pumps delivery rate is higher
than the limits specified on the da-
ta plate.
The pump is overloaded because it
is pumping liquid that is too dense
and viscous.
The motor bearings are worn.
7.6 The electric pump starts, but the
system's general protection is activated
Cause
A short circuit in the electrical system.
7.7 The electric pump starts, but the
system's residual current device (RCD) is
activated
Cause Remedy
There is an earth (ground) Check the insulation of the electrical system
leakage. components.
7.8 The pump runs but delivers too little or
no water
Cause Remedy
There is air inside the pump
• Bleed the air
or the piping.
The pump is not correctly Stop the pump and repeat the prime proce-
primed. dure. If the problem continues:
• Check that the mechanical seal is not
• Check the suction pipe for perfect tight-
• Replace any valves that are leaking.
The throttling on the delivery Open the valve.
side is too extensive.
Valves are locked in closed or Disassemble and clean the valves.
partially closed position.
The pump is clogged. Contact the Sales and Service Department.
The piping is clogged. Check and clean the pipes.
The rotation direction of the Change the position of two of the phases
impeller is wrong (three-phase on the terminal board of the motor or in
version). the electric control panel.
The suction lift is too high or Check the operating conditions of the
the flow resistance in the suc- pump. If necessary, do the following:
tion pipes is too great.
• Decrease the suction lift
• Increase the diameter of the suction pipe
7.9 The electric pump stops, and then
rotates in the wrong direction
Cause
There is a leakage in one or both of the following
components:
• The suction pipe
• The foot valve or the check valve
There is air in the suction pipe.
7.10 The pump starts up too frequently
Cause
There is a leakage in one or both of the fol-
lowing components:
• The suction pipe
• The foot valve or the check valve
Remedy
Partially close the on-off valve down
stream until the delivery rate is equal or
less than the limits specified on the da-
ta plate.
Check the actual power requirements
based on the characteristics of the
pumped liquid and replace the motor
accordingly.
Contact the Sales and Service Depart-
ment.
Remedy
Check the electrical system.
leaking.
ness.
Remedy
Repair or replace the
faulty component.
Bleed the air.
Remedy
Repair or replace the faulty
component.
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