DAB CM series Installationsanweisung Und Wartung Seite 21

Fault
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 vibrates and operates
noisily.
The absorbed current is too high.
Check (possible cause)
− Ensure that the mains voltage
corresponds to the voltage on the
data plate.
− Check that the connections have
been made correctly.
− Check that all the phases are
present on the terminal board.
− The shaft is blocked. Look for
possible obstructions in the pump
or motor.
− Capacitor
broken.
− Check the supply voltage which
may be insufficient.
− Check whether any moving parts
are scraping against fixed parts.
− Check the state of the bearings.
− Check that all the phases are
present on the terminal board (on
three-phase models).
− 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.
trips too
− Ensure
temperature is not too high.
− Check the calibration of the
protection.
− Check the motor rotation speed.
− Check the state of the bearings.
− 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.
− Ensure that the mains voltage
corresponds to the voltage on the
data plate.
− Check that the fluid density or
viscosity is not too high.
− Check whether any moving parts
are scraping against fixed parts.
− The feeding voltage is not the
same as the voltage on the data
plate.
− The pump is running above its
plate characteristics.
ENGLISH
short-circuiting or
that the environment
15
Remedy
Correct any errors.
If not, restore the missing phase.
Remove any obstructions.
Change the capacitor.
Eliminate the cause of the scraping.
Change any worn bearings.
If not, 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.
Consult the motor data plate.
Change any worn bearings.
Fasten any loose parts.
Increase the system
keeping within the allowed limits.
Reduce the flow rate.
Analyse the fluid to be pumped.
Eliminate the cause of the scraping.
Feed the motor with the correct
voltage.
Reduce the flow rate.
any cables
pressure,