DAB K 36/200 Installationsanweisung Und Wartung Seite 32

FAULT
The motor
5.
protection trips too
frequently.
The pump does not
6.
deliver.
The pump does not
7.
prime.
The pump supplies
8.
insufficient flow.
The pump flow rate
9.
is not constant.
The pump turns in
10.
the opposite
direction when
switching off.
The pump vibrates
11.
and operates noisily.
CHECK (possible cause)
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. 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. 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. The pump is running above its plate
characteristics.
ENGLISH
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 5 of the instructions for
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.
C. Reduce the flow rate.
26
REMEDY