Lowara ATEX Manual De Instalación, Uso Y Mantenimiento página 19

7.2 The main switch is on. The pump unit
does not start.
Cause
There is no power supply.
The thermal protector
incorporated in the pump (if any)
has tripped.
The thermal relay or motor
protector in the electric control
panel has tripped.
The protective device against dry
running has tripped.
The fuses for the pump or
auxiliary circuits are blown.
7.3 The pump unit starts, but the thermal
protector trips or the fuses blow
immediately after
Cause
The power supply cable is
damaged.
The thermal protection or fuses
are not suited for the motor
current.
The electric motor is short circuit.
The motor overloads.
7.4 The pump unit starts, but the thermal
protector trips or the fuses blow a short
time after
Cause
The electrical panel is situated in
an excessively heated area or is
exposed to direct sunlight.
7.5 The pump unit 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
impeller.
The pumps delivery rate is
higher than the limits specified
on the data plate.
The pump is overloaded
because it is sucking a dense
and viscous liquid.
The motor bearings are worn.
7.6 The pump unit starts, but the system's
general protection is activated
Cause
A short circuit in the electrical
system.
Solution
•
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:
•
liquid level in the tank, or the
mains pressure.
• protective device and its
connecting cables.
Replace the fuses.
Solution
Check the cable and replace as
necessary.
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.
Solution
Protect the electrical panel from
heat source and direct sunlight.
Solution
Contact Xylem or the Authorised
Distributor.
Partially close the on-off valve
down stream until the delivery
rate is equal or less than the
limits specified on the data
plate.
Check the actual power
requirements based on the
characteristics of the pumped
liquid and replace the motor
accordingly.
Contact Xylem or the Authorised
Distributor.
Solution
Check the electrical system.
7.7 The pump unit starts, but the system's
residual current device (RCD) is activated
Cause
There is a leak to earth.
7.8 The pump runs but delivers too little or no
liquid
Cause
There is air inside the pump or
the piping.
The pump is not correctly
primed.
The throttling on the delivery side
is too extensive.
Valves are locked in closed or
partially closed position.
The pump is clogged.
The piping is clogged.
The rotation direction of the
impeller is wrong
(three-phase version)
The suction lift is too high or the
flow resistance in the suction
pipes is too great.
The power supply voltage is not
within the working limits of the
motor.
A power phase is missing.
7.9 The pump unit 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 following components:
•
The suction pipe
• The foot valve or the check
valve
There is a ruptured membrane or
no air pre-charge in the pressure
tank.
7.11 The pump vibrates and generates too much
noise
Cause
Pump cavitation
en - Original instructions
Solution
Check the insulation of the
electrical system components.
Solution
• Bleed the system.
Stop the pump and repeat the
prime procedure.
If the problem continues:
•
Check that the mechanical
seal is not leaking.
•
Check the suction pipe for
perfect tightness.
• Replace any valves that are
leaking.
Open the valve.
Disassemble and clean the
valves.
Contact Xylem or the Authorised
Distributor.
Check and clean the pipes.
Change the position of two of
the phases on the terminal
board of the motor or in the
electric control panel.
Check the operating conditions
of the motor. If necessary, do
the following:
•
Decrease the suction lift.
•
Increase the diameter of the
suction pipe.
Check the operating conditions
of the motor.
Check the
• Power supply
•
Electrical connection
Solution
Repair or replace the faulty
component.
Bleed.
Solution
Repair or replace the faulty
component.
See the relevant instructions in
the pressure tank manual.
Solution
Reduce the required flow rate by
partially closing the on-off valve
downstream from the pump. If
the problem persists check the
operating conditions of the
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