ENGLISH
36
INCONVENIENTS PROBABE
CAUSES
REMEDIES
Electric pump starting with thermal
protection intervention winding.
Voltage different from plate.
Measure the voltage between two
phases of the motor. Tolerance: - 10
%/+ 6 %. Restore the correct voltage.
Wrong rotation direction.
Invert two of the three phases (see
par. 7.2: “Direction of rotation”)
Three-phase motor: phase interruption.
Reset connections.
Three-phase motor: Low rating.
Adjust rating of relay value.
Short-circuit; earth leakage in electric
cables or motor.
Individuate interruption and repair
(contact the Assistance Service if
necessary).
Too high temperature of pumped liquid.
Check whether the right type of pump
has been selected.
Pumped liquid too dense.
Dilute liquid. Check whether the right
type of pump has been selected.
Dry running of the electropump.
Check the level of liquid in the sinkhole
and the level control instruments.
Defective thermal relay.
Replace it.
Electric pump drawing more power
than value of plate.
Overload due to pump clogged.
Remove obstruction and clean (contact
Assistance Service if necessary).
Pumped liquid too dense or viscious.
Dilute liquid. Check whether the right
pump has been selected.
Overload due to obstruction.
Remove obstruction and clean of
extraneous bodies.
Wrong rotation direction.
Invert two of the three phases (see
par. 7.2: “Direction of rotation”).
The pump is operating outside the
allowed working range.
Check the work point of the pump and,
if necessary, increase the delivery
pressure.
Insufficient performances.
Suction, impeller, valve ordelivery
pipeline clogged.
Clean carefully.
Weared pump or impeller.
Replace or repair.
Errato senso di rotazione.
Invert two of the three phases (see
par. 7.2: “Direction of rotation”).
Air or gas in the pumped liquid.
Increase dimensions of pit or collecting
tank and foresee degasing devices.
Presence of air in the pump.
Vent the pump. (see installation
paragraph).
