Troubleshooting - DAB KDN 32-125.1 Anleitungen Für Installation Und Wartung

14.

TROUBLESHOOTING

FAULT
1. The motor does not
start and makes no
noise.
2. The motor does not
start but makes noise.
3. The motor turns with
difficulty.
4. The (external) motor
protection trips
immediately after
starting.
5. The motor protection
trips too frequently.
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.
CHECK (possible cause)
A. Check the protection fuses.
B. Check the electric connections.
C. Check that the motor is live
A. Ensure that the
corresponds to the voltage on the data
plate.
B. Check that the connections have been
made correctly.
C. Check that all the phases are present on
the terminal board.
D. The shaft is blocked. Look for possible
obstructions in the pump or motor.
A. Check the supply voltage which may be
insufficient.
B. Check whether any moving parts are
scraping against fixed parts.
C. Check the state of the bearings.
A. Check that all the phases are present on
the terminal board.
B. Look for possible open or dirty contacts
in the protection.
C. Look for possible faulty insulation of the
motor, checking the phase resistance and
insulation to earth.
D. The pump is functioning above the work
point for which it was intended.
E. The protection tripping values are wrong.
F. The viscosity or density of the pumped
fluid are different from those used in the
design phase.
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. 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.
ENGLISH
A. If they are burnt-out, change them.
 If the fault is repeated immediately this means
that the motor is short circuiting..
mains voltage
B. Correct any errors.
C. If not, restore the missing phase.
D. Remove the obstruction.
B. Eliminate the cause of the scraping.
C. Change any worn bearings.
A. If not, restore the missing phase.
B. Change or clean the component concerned.
C. Look for possible faulty insulation of the
motor, checking the phase resistance and
insulation to earth.
D. Set the work point to suit the pump
characteristics.
E. Check the set values on the motor protector:
alter them or change the component if
necessary.
F. Reduce the flow rate with a shutter on the
delivery side or install a larger motor.
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.
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.
32
REMEDY