DAB NKM-G Serie Instructions De Mise En Service Et D'entretien page 30

FAULT
6. The pump does not
deliver.
7. The pump does not
prime.
8. The pump supplies
insufficient flow.
9. Invert the connection
of two supply wires.
10. The pump turns in the
opposite direction
when switching off.
11. The pump vibrates and
operates noisily.
CHECK (possible cause)
A. The pump has not been correctly primed.
B. Check that the direction of rotation of the
three-phase motors is correct.
C. Difference in suction level too high.
D. The diameter of the
insufficient or the length is too long.
E. Foot valve blocked.
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. Blocked foot valve.
B. The impeller is worn or blocked.
C. The diameter of the
insufficient.
D. Check that the direction of rotation is
correct.
A. Intake pressure too low.
B. Intake pipe or pump partly blocked by
impurities.
A. Leakage in the intake pipe.
B. Foot valve or check valve faulty or blocked
in partly open position.
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. Presence of air in the pump or in the intake
manifold.
D. Pump-motor alignment
performed.
ENGLISH
A. Fill the pump and the intake pipe with water. Prime
the pump.
B. Invert the connection of two supply wires.
C. See point 8 of the instructions on "Installation".
intake pipe is D. Replace the intake pipe with one with a larger
diameter.
E. Clean the foot valve.
A. Eliminate the phenomenon, checking the intake
pipe accurately, and prime again.
B. Correct the inclination of the intake pipe.
A. Clean the foot valve.
B. Change the impeller or remove the obstruction.
intake pipe is C. Replace the pipe with one with a larger diameter.
D. Invert the connection of two supply wires.
B. Clean the intake pipe and the pump.
A. Eliminate the fault.
B. Repair or replace the faulty valve.
A. Fasten any loose parts.
B. Reduce the intake height or check for load losses.
Open the intake valve.
C. Bleed the intake pipes and the pump.
incorrectly D. Repeat the procedure described in paragraph 7.2.
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REMEDY