Troubleshooting - DAB KV 3/12 Installationsanweisung 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.
CHECK
(possible cause)
A. Check the protection fuses.
B. Check the electric connections.
C. Check that the motor is live.
The motor protector may have tripped
D.
due to exceeding the maximum
temperature limit
version).
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
resistance and insulation to earth.
A. Ensure that the
temperature is not too high.
B. Check the calibration
protection.
C. Check the motor rotation speed.
D. Check the state of the bearings.
A. The pump has not been correctly
primed (presence of air in the intake
pipe or inside the pump).
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 horizontal stretch is
too long.
E. Foot valve or intake pipe blocked.
ENGLISH
A. If they are burnt-out, change them.
 If the fault is repeated immediately
this means that the motor is short
circuiting.
Wait for automatic reset of the motor
D.
protector once the temperature has
(single-phase
fallen below the maximum limit
mains voltage
B. Correct any errors.
C. If not, restore the missing phase.
D. Remove any obstructions.
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. Change the motor casing with the
the phase stator or reset any cables discharging
to earth.
environment A. Provide suitable ventilation in the
environment where the pump is
installed.
of the B. Calibrate at a current value suitable
for the motor absorption at full load.
C. Consult the motor data plate.
D. 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 7 of the instructions for
installation.
D. Replace the intake pipe with one with
a larger diameter.
E. Clean the foot valve and the intake
pipe.
27
REMEDY
.