The Electric Pump Stops, And Then Rotates In The Wrong Direction; Manual - Lowara e-NSCE Montage-, Betriebs- Und Wartungshandbuch

Cause
ing liquid that is too
dense and viscous.
The motor bearings
are worn.
7.6 The electric pump starts, but
the system's general protection is
activated
Cause
A short circuit in the electri-
cal system.
7.7 The electric pump starts, but
the system's residual current device
(RCD) is activated
Cause Remedy
There is an ground Check the insulation of the
(earth) leakage. electrical system components.
7.8 The pump runs but delivers too
little or no liquid
Cause Remedy
There is air inside • Bleed the air
the pump or the pip-
ing.
The pump is not Stop the pump and repeat the
correctly primed. prime procedure.
If the problem continues:
• Check that the mechanical
• Check the suction pipe for
• Replace any valves that
The throttling on the Open the valve.
delivery side is too
extensive.
Valves are locked in Disassemble and clean the
closed or partially valves.
closed position.
The pump is clog- Contact the local sales and
ged. service representative.
The piping is clog- Check and clean the pipes.
ged.
The rotation direc- Change the position of two of
tion of the impeller the phases on the terminal
is wrong . board of the motor or in the
electric control panel.
The suction lift is Check the operating condi-
too high or the flow tions of the pump. If necessa-
ry, do the following:
Remedy
characteristics of the
pumped liquid and replace
the motor accordingly.
Contact the local sales and
service representative.
Remedy
Check the electrical
system.
seal is not leaking.
perfect tightness.
are leaking.
Cause Remedy
resistance in the • Decrease the suction lift
suction pipes is too • Increase the diameter of
great.
7.9 The electric pump 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 compo-
nents:
• The suction pipe
• The foot valve or the check
valve
There is a ruptured membrane
or no air pre-charge in the pres-
sure tank.
7.11 The pump vibrates and
generates too much noise
Cause Remedy
Pump cavita- Reduce the required flow rate by
tion partially closing the on-off valve
downstream from the pump. If the
problem persists check the operat-
ing conditions of the pump (for ex-
ample height difference, flow re-
sistance, liquid temperature).
The motor Contact the local sales and service
bearings are representative.
worn.
There are for- Contact the local sales and service
eign objects in- representative.
side the pump.
Impeller rubs Contact the local sales and service
on the wear representative.
ring
For any other situation, refer to the local sales and
service representative.
en - Original instructions
the suction pipe
Remedy
Repair or re-
place the faulty
component.
Bleed the air.
Remedy
Repair or replace
the faulty compo-
nent.
See the relevant
instructions in the
pressure tank

manual.

23