M Pumps V MODULAR Series User Manual page 18

The pump has seized or is about to seize
The motor and pump are misaligned
The motor bearings are damaged or worn
Motor under dimensioned
Motor overload threshold set incorrectly
The guard against the motor dry running
(where present) has failed or has been set
.
incorrectly
FUNCTIONING WITH NOISE DEFECTS AND/OR
VIBRATIONS
Causes
Insufficient inlet pressure, consequent
cavitation, insufficient lubrication of the
bearings (with mechanical damages if the
condition persists).
STOP IMMEDIATELY THE PUMP!
Wear, erosion and immediate damage to the
impeller and internal bearings.
Wear of the coupling motor-pump
Ball bearings or motor failure.
Uninsured motor or base plate
Misalignment or improper anchoring of the
pipes.
Pag. 18/32
. Check the free rotation of the impeller. Check for internal
obstructions
Refer to section 3.8 of this manual
. Replace the motor bearings, investigate the causes of
breakage.
Mount a more powerful motor (check in advance with your
distributor
Check
Control flow decreases or fluid intake
Remedies / actions
Refer to paragraphs 3.4, 3.5, 4.1, 4.2, 4.3 of this manual
Check inside the pump damages or obstructions.
Replace the coupling and proceed to the realignment of
pump and motor.
Check and replace them if necessary.
Make sure that the motor and base plate are firmly
.
anchored to foundations and do not produce any
abnormal vibration.
Check correct alignment of pipes and supports, refer to
section 3.2 of this manual
Doc. ISM0023 Instruction Manual of series V MODULAR – Rev.02
.
M PUMPS
).
the security settings of the motor
.
.