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31
en - Original instructions
7.3 The electric pump starts, but the
thermal protector trips or the fuses
blow immediately after
Cause
Remedy
The power supply
cable is damaged.
Check the cable and
replace as necessary.
The thermal
protection or fuses
are not suited for
the motor current.
Check the
components and
replace as necessary.
The electric motor is
short circuit.
Check the
components and
replace as necessary.
The motor
overloads.
Check the operating
conditions of the
pump and reset the
protection.
7.4 The electric pump starts, but the
thermal protector trips or the fuses
blow a short time after
Cause
Remedy
The electrical
panel is situated in
an excessively
heated area or is
exposed to direct
sunlight.
Protect the electrical
panel from heat
source and direct
sunlight.
The power
supply voltage is
not within the
working limits of
the motor.
Check the operating
conditions of the
motor.
A power phase is
missing.
Check the
power supply
electrical
connection
7.5 The electric pump starts, but
the thermal protector trips a varying
time after
Cause
Remedy
There are foreign
objects (solids or
fibrous
substances) inside
the pump which
have jammed the
impeller.
Contact Xylem or the
Authorised Distributor.
The pumps
delivery rate is
higher than the
limits specified on
the data plate.
Partially close the on-
off valve down
stream until the
delivery rate is equal
or less than the limits
specified on the data
plate.
The pump is
overloaded
because it is
pumping liquid that
is too dense and
viscous.
Check the actual
power requirements
based on the
characteristics of the
pumped liquid and
replace the motor
accordingly.
The motor bearings
are worn.
Contact Xylem or the
Authorised Distributor.
7.6 The electric pump starts, but the
system's general protection is
activated
Cause
Remedy
A short circuit in the
electrical system.
Check the
electrical system.
7.7 The electric pump starts, but the
system's residual current device
(RCD) is activated
Cause
Remedy
There is an
ground (earth)
leakage.
Check the insulation of
the electrical system
components.
7.8 The electric pump starts, but the
thermal protector trips a varying time
after
Cause
Remedy
There is air
inside the pump
or the piping.
Bleed the air.
The pump is not
correctly primed.
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.
The throttling on
the delivery side
is too extensive.
Open the valve.
Valves are
locked in closed
or partially closed
position.
Disassemble and clean
the valves.
The pump is
clogged.
Contact Xylem or the
Authorised Distributor.
The piping is
clogged.
Check and clean the
pipes.
The rotation
direction of the
impeller is wrong
.
Change the position of
two of the phases on the
terminal board of the
motor or in the electric
control panel.
The suction lift is
too high or the
flow resistance in
the suction pipes
is too great.
Check the operating
conditions of the pump.
If necessary, do the
following:
Decrease the
suction lift.
Increase the
diameter of the
suction pipe.