DAB NKV 1 Instrucciones De Instalación Y Mantenimiento página 28

Fault
The motor protection
frequently.
The pump does not deliver.
The pump does not prime.
The pump supplies insufficient flow.
The pump flow rate is not constant.
The pump turns in the opposite
direction when switching off.
The pump vibrates and operates
noisily.
Check (possible cause)
trips too  Ensure
temperature is not too high.
 Check
protection.
 Check the state of the bearings.
 Check the motor rotation speed.
 Check priming.
 On three-phase motors, check
that the direction of rotation is
correct.
 Difference in suction level too
high.
 The diameter of the intake pipe is
insufficient
stretch is too long.
 Foot valve or intake pipe blocked.
 The intake pipe or the foot valve
is taking in air.
 Check the slope of the suction
pipe.
 Foot valve or impeller blocked.
 The diameter of the intake pipe is
insufficient.
 Check
rotation is correct.
 Intake pressure too low.
 Intake
blocked by impurities.
 Leakage in the intake pipe.
 Foot valve or check valve faulty
or blocked in partly open position.
 Check that the pump and/or the
pipes are firmly anchored.
 There is cavitation in the pump.
 The pump is running above its
plate characteristics.
 The pump is not turning freely.
ENGLISH
that the environment
the calibration of the
or the horizontal
that the direction
pipe or pump partly
25
Remedy
Provide suitable ventilation in the
environment where the pump is
installed.
Calibrate at a current value suitable
for the motor absorption at full load.
Change any worn bearings.
Invert the connection of two supply
wires.
Replace the intake pipe with one
with a larger diameter.
Clean the foot valve and the intake
pipe.
Check the suction pipe, repeat the
priming operations.
Correct the inclination of the intake
pipe.
Remove clog. Replace the impeller
if weared down.
Replace the pipe with one with a
larger diameter.
of Invert the connection of two supply
wires.
Remove clog.
Repair or replace the faulty valve.
Reduce the intake height or check
for load losses.
Reduce the flow rate.
Check the state of wear of the
bearings.