DAB NKV 15/12 T [26/108] Fault check possible cause remedy
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DAB NKV 15/12 T [26/108] Fault check possible cause remedy

DAB KVCX 65-50 M [26/108] Fault check possible cause remedy
ENGLISH
21
Fault Check (possible cause) Remedy
 Verify that supply voltage is at an
acceptable valve.
 Check whether any moving parts
are scraping against fixed parts.
Eliminate the cause of the scraping.
The motor turns with difficulty.
 Check the state of the bearings.
Change any worn bearings.
 Check that all the phases are
present.
Restore the missing phase.
 Look for possible open or dirty
contacts in the protection.
Change or clean the component
concerned.
The (external) motor protection
trips immediately after starting.
 Look for possible faulty insulation
of the motor, checking the phase
resistance and insulation to earth.
Change the motor casing with the
stator or reset any cables
discharging to earth.
 Ensure that the environment
temperature is not too high.
Provide suitable ventilation in the
environment where the pump is
installed.
 Check the calibration of the
protection.
Calibrate at a current value suitable
for the motor absorption at full load.
 Check the state of the bearings.
Change any worn bearings.
The motor protection trips too
frequently.
 Check the motor rotation speed.
 Check priming.
 On three-phase motors, check that
the direction of rotation is correct.
Invert the connection of two supply
wires.
 Difference in suction level too high.
 The diameter of the intake pipe is
insufficient or the horizontal stretch
is too long.
Replace the intake pipe with one
with a larger diameter.
The pump does not deliver.
 Foot valve or intake pipe blocked.
Clean the foot valve and the intake
pipe.
 The intake pipe or the foot valve is
taking in air.
Check the suction pipe, repeat the
priming operations.
The pump does not prime.
 Check the slope of the suction
pipe.
Correct the inclination of the intake
pipe.
 Foot valve or impeller blocked.
Remove clog. Replace the impeller
if weared down.
 The diameter of the intake pipe is
insufficient.
Replace the pipe with one with a
larger diameter.
The pump supplies insufficient flow.
 Check that the direction of rotation
is correct.
Invert the connection of two supply
wires.
 Intake pressure too low.
The pump flow rate is not constant.
 Intake pipe or pump partly blocked
by impurities.
Remove clog.
 Leakage in the intake pipe.
The pump turns in the opposite
direction when switching off.
 Foot valve or check valve faulty or
blocked in partly open position.
Repair or replace the faulty valve.
 Check that the pump and/or the
pipes are firmly anchored.
 There is cavitation in the pump.
Reduce the intake height or check
for load losses.
 The pump is running above its
plate characteristics.
Reduce the flow rate.
The pump vibrates and operates
noisily.
 The pump is not turning freely.
Check the state of wear of the
bearings.

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DAB ENGLISH Fault The motor turns with difficulty The external motor protection trips immediately after starting The motor protection trips too frequently The pump does not deliver The pump does not prime The pump supplies insufficient flow Check possible cause Remedy Verify that supply voltage is at an acceptable valve Check whether any moving parts are scraping against fixed parts Check the state of the bearings Check that all the phases are present Look for possible open or dirty contacts in the protection Look for possible faulty insulation of the motor checking the phase resistance and insulation to earth Ensure that the environment temperature is not too high Check the calibration of the 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 or the horizontal 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 that the direction of rotation is correct Intake pressure too low Intake pipe or pump partly blocked by impurities Leakage in the intake pipe Foot valve or check valve faulty or blocked in partly open position The pump flow rate is not constant The pump turns in the opposite direction when switching off The pump vibrates and operates noisily w AT E R T E c H N O L O G Y Check that the pump and or pipes are firmly anchored There is cavitation in the pump the The pump is running above plate characteristics The pump is not turning freely its 21 Eliminate the cause of the scraping Change any worn bearings Restore the missing phase Change or clean the component concerned Change the motor casing with the stator or reset any cables discharging to earth 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 with a larger diameter pipe with one 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 Invert the connection of two supply wires Remove clog Repair or replace the faulty valve Reduce the intake for load losses Reduce the flow rate Check the bearings state height of wear or check of the

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