Tabla de contenido
en - Original instructions
Checking the bearing
seals
Check for quiet running
6.3 Disassemble and replace the pump
parts
For more information about spare parts and assem-
bly and disassembly of the pump, contact the local
sales and service representative.
7 Troubleshooting
7.1 Troubleshooting for users
The main switch is on, but the electric pump
does not start.
Cause
The thermal protector
incorporated in the
pump (if any) has trip-
ped.
The protective device
against dry running has
tripped.
The electric pump starts, but the thermal protection
trips a varying time after.
Cause
There are foreign objects
(solids or fibrous sub-
stances) inside the pump
which have jammed the
impeller.
The pump is overloaded
because it is pumping liq-
uid that is too dense and
viscous.
The pump runs but delivers too little or no liquid.
Cause
Remedy
The pump is clog-
Contact the Sales and Service
ged.
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
24
place the mechanical
seal if leakage is found.
Check correct seating of
axial seal rings mounted
on the shaft. Only gentle
contact of the sealing lip
shall be established.
Check frequently for qui-
et running of the pump
with vibration measure-
ments tools.
Remedy
Wait until the pump has
cooled down. The thermal
protector will automatical-
ly reset.
Check the liquid level in
the tank, or the mains
pressure.
Remedy
Contact the Sales and
Service Department.
Check the actual power
requirements based on
the characteristics of the
pumped liquid and then
contact the Sales and
Service Department.
Cause
Remedy
There is no power
supply.
The thermal protector
Wait until the pump has
incorporated in the
cooled down. The thermal
pump (if any) has trip-
protector will automatically
ped.
reset.
The thermal relay or
Reset the thermal protec-
motor protector in the
tion.
electric control panel
has tripped.
The protective device
Check the:
against dry running
has tripped.
The fuses for the
Replace the fuses.
pump or auxiliary cir-
cuits are blown.
7.3 The electric pump starts, but
the thermal protector trips or the
fuses blow immediately after
Cause
Remedy
The power supply ca-
Check the cable and re-
ble is damaged.
place as necessary.
The thermal protection
Check the components
or fuses are not suited
and replace as necessary.
for the motor current.
The electric motor is
Check the components
short circuit.
and replace as necessary.
The motor overloads.
Check the operating condi-
tions of the pump and re-
set the protection.
7.4 The electric pump starts, but
the thermal protector trips or the
fuses blow a short time after
Cause
The electrical panel is situ-
ated 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. Check the
• Restore the power sup-
ply.
• Make sure all electrical
connections to the pow-
er supply are intact.
• liquid level in the tank,
or the mains pressure.
• protective device and its
connecting cables.
Remedy
Protect the electrical
panel from heat source
and direct sunlight.
Check the operating
conditions of the motor.
• power supply
• electrical connec-
tion
Tabla de contenido
