Troubleshooting - DAB KVC series Installations- Und Wartungsanleitungen

10. TROUBLESHOOTING

Fault
The motor does not start and makes
no noise.
The motor does not start but makes
noise.
The motor turns with difficulty.
The (external) motor protection trips
immediately after starting.
The motor protection
frequently.
The pump does not deliver.
The pump does not prime.
The pump supplies insufficient flow.
Check (possible cause)
− Check the protection fuses.
− Check the electric connections.
− Check that the motor is live.
− Motor protector cut-off the motor,
for the single-phased motors, due
to over heating of tag windings.
− Check
correspond with voltage on the
pump label.
− Check the electrical connections.
− Check that all the phases are
present.
− Check for obstructions in the
pump or motor.
− 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
trips too
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.
ENGLISH
that supply voltage
that the environment
the calibration of the
or the horizontal
that the direction
20
Remedy
If they are burnt-out, change them.
Correct any errors.
Wait for automatic reset of the motor
protector once the temperature has
fallen below the maximum limit.
Correct any errors.
Restore the missing phase.
Remove any obstructions.
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
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 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.
any cables