Xylem LOWARA ESH ATEX Manuel D'installation, D'exploitation Et De Maintenance page 31

7.3 The electric pump 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 electric pump 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.
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
impeller.
The pumps
delivery rate is
higher than the
limits specified on
the data plate.
The pump is
overloaded
because it is
pumping liquid that
is too dense and
viscous.
The motor bearings
are worn.
Remedy
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.
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 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.
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 Check the insulation of
ground (earth) the electrical system
leakage. components.
7.8 The electric pump starts, but the
thermal protector trips a varying time
after
Cause Remedy
There is air Bleed the air.
inside the pump
or the piping.
The pump is not
Stop the pump and
correctly primed.
repeat the prime
procedure.
If the problem
continues:



The throttling on Open the valve.
the delivery side
is too extensive.
Valves are Disassemble and clean
locked in closed the valves.
or partially closed
position.
The pump is Contact Xylem or the
clogged. Authorised Distributor.
The piping is Check and clean the
clogged. pipes.
The rotation Change the position of
direction of the two of the phases on the
impeller is wrong terminal board of the
. motor or in the electric
control panel.
Check the operating
The suction lift is
conditions of the pump.
too high or the
If necessary, do the
flow resistance in
following:
the suction pipes

is too great.

en - Original instructions
Remedy
Check the
electrical system.
Check that the
mechanical seal is
not leaking.
Check the suction
pipe for perfect
tightness.
Replace any
valves that are
leaking.
Decrease the
suction lift.
Increase the
diameter of the
suction pipe.
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