en - Translation of the original instructions
There are foreign objects (solids or Contact the Sales and Service
fibrous substances) inside the Department.
pump which have jammed the im-
peller.
Disconnect and lock out electrical power before installing or
servicing the unit.
The pump is overloaded because Check the actual power require-
it is pumping liquid that is too
dense and viscous.
ments based on the characteris-
tics of the pumped liquid and then
contact the Sales and Service
Department.
• Maintenance and service must be performed by skilled
and qualified personnel only.
• Observe accident prevention regulations in force.
• Use suitable equipment and protection.
• Make sure that the drained liquid does not cause dam-
age or injuries.
The pump runs but delivers too little or no liquid.
The pump is clogged. Contact the Sales and Service Department.
If the user wishes to schedule regular maintenance deadlines, they are
dependent on the type of pumped liquid and on the operating condi-
tions of the pump.
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
Contact the local sales and service representative for any requests or
information regarding routine maintenance or service.
Extraordinary maintenance may be necessary to clean the liquid end
and/or replace worn parts.
There is no power supply.
• Restore the power supply.
• Make sure all electrical connec-
tions to the power supply are in-
tact.
After approximately five years, the grease in the motor bearings is so
aged that a replacement of the bearings is recommended. The bear-
ings must be replaced after 25000 operating hours or according to the
motor supplier maintenance instructions, whichever is shorter.
The thermal protector incorpo- Wait until the pump has cooled down.
rated in the pump (if any) has The thermal protector will automati-
tripped.
Motor with regreasable bearings
Follow motor supplier maintenance instructions.
The thermal relay or motor
protector in the electric control
panel has tripped.
Reset the thermal protection.
For information about torque values, pump data see Figure 28 .
The protective device against Check the:
dry running has tripped.
• liquid level in the tank, or the
mains pressure
• protective device and its con-
necting cables
Check the flexible elements of the
coupling. Replace the relevant
parts if there is any sign of wear
and check the alignment.
The fuses for the pump or
auxiliary circuits are blown.
Check the mechanical seal
Checking the bearing seals
Check for leakage of the mechani-
cal seal. Replace the mechanical
seal if leakage is found.
7.3 The electric pump starts, but the thermal
protector trips or the fuses blow immediately
after
Check correct seating of axial seal
rings mounted on the shaft. Only
gentle contact of the sealing lip
shall be established.
The power supply cable is
damaged.
Check the cable and replace as nec-
essary.
6.4 Disassemble and replace the pump parts
For more information about spare parts and assembly and disassem-
bly of the pump see Figure 1 , Figure 2 , Figure 3 .
The thermal protection or fuses Check the components and replace
are not suited for the motor
current.
See the Repair and Assembly Instructions which are available for
download from our homepage.
The electric motor is short cir- Check the components and replace
Check the operating conditions of the
pump and reset the protection.
7.1 Troubleshooting for users
7.4 The electric pump starts, but the thermal
protector trips or the fuses blow a short time
after
The main switch is on, but the electric pump does not start.
The thermal protector incorpo-
rated in the pump (if any) has
tripped.
Wait until the pump has cooled
down. The thermal protector will au-
tomatically reset.
The electrical panel is situated in an Protect the electrical panel from
The protective device against
dry running has tripped.
Check the liquid level in the tank, or
the mains pressure.
excessively heated area or is ex-
posed to direct sunlight.
heat source and direct sunlight.
The power supply voltage is not
within the working limits of the mo- of the motor.
tor.
Check the operating conditions
The electric pump starts, but the thermal protection trips a varying time
after.
e1631 Installation, Operation, and Maintenance Manual
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