DAB KDN 32-125.1 Instructions De Mise En Service Et D'entretien page 28

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.
12. The stuffing box area
gets too hot after a brief
period of operation.
13. There is too much
dripping from the stuffing
box.
14. The support temperature
in the bearings area is
too high.
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 intake pipe is 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 intake pipe is 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 incorrectly performed.
A. The follower has been gripped too tightly by the
regulating screws.
B. The follower is in an oblique position with
respect to the pump shaft.
A. The follower has been incorrectly tightened or
the stuffing box is not suitable or is fitted
incorrectly.
B. The shaft or the protection bush is damaged or
worn.
C. The packing rings are worn..
A. Check motor and pump alignment.
B. Increased axial thrust due to wear of the
impeller pressure rings.
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".
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.
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.
D. Repeat the procedure described in paragraph 7.2.
A. Stop the pump and slacken the follower, then proceed
as in paragraph 12.3.1.
B. Stop the pump and position the follower perpendicular
to the pump shaft.
A. Check the follower and the type of stuffing box used.
B. Check and/or change the shaft or the shaft protection
bush.
C. Proceed as in paragraph 12.3.1.
A. Proceed as in paragraph 7.2
B. Clean the balancing holes in the impeller, change the
pressure rings.
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REMEDY