ENGLISH
19
5.
The motor protection
trips too frequently.
A.
Ensure that the environment temperature is
not too high.
B.
Check the calibration of the protection.
C.
Check the state of the bearings.
D.
Check the motor rotation speed.
A.
Provide suitable ventilation in the
environment where the pump is installed.
B.
Calibrate at a current value suitable for the
motor absorption at full load.
C.
Change any worn bearings.
6.
The pump does not
deliver.
A.
The pump has not been correctly primed.
B.
On three-phase motors, check that the
direction of rotation is correct.
C.
Difference in suction level too high.
D.
The diameter of the intake pipe is insufficient
or the length is too long.
E.
Foot valve blocked.
A.
Fill the pump and the intake pipe with water.
Prime the pump.
B.
Invert the connection of two supply wires.
C.
See point 5 of the instructions for installation.
D.
Replace the intake pipe with one with a larger
diameter.
E.
Clean the foot valve.
7.
The pump does not
prime.
A.
The intake pipe or the foot valve is taking in
air.
B.
The downward slope of the intake pipe
favours the formation of air pockets.
A.
Eliminate the phenomenon, checking the
intake pipe accurately, and prime again.
B.
Correct the inclination of the intake pipe.
8.
The pump supplies
insufficient flow.
A.
Blocked foot valve.
B.
The impeller is worn or blocked.
C.
The diameter of the intake pipe is insufficient.
D.
Check that the direction of rotation is correct.
A.
Clean the foot valve.
B.
Change the impeller or remove the
obstruction.
C.
Replace the pipe with one with a larger
diameter.
D.
Invert the connection of two supply wires.
9.
The pump flow rate is
not constant.
A.
Intake pressure too low.
B.
Intake pipe or pump partly blocked by
impurities.
B.
Clean the intake pipe and the pump.
10.
The pump turns in the
opposite
direction
when switching off.
A.
Leakage in the intake pipe.
B.
Foot valve or check valve faulty or blocked in
partly open position.
A.
Eliminate the fault.
B.
Repair or replace the faulty valve.
11.
The pump vibrates and
operates noisily.
A.
Check that the pump and/or the pipes are
firmly anchored.
B.
There is cavitation in the pump (see point 8,
paragraph on INSTALLATION).
C.
The pump is running above its plate
characteristics.
A.
Fasten any loose parts.
B.
Reduce the intake height or check for load
losses.
C.
Reduce the flow rate.
