ABB High dynamic performance HDP Serie Manuel D'installation, D'utilisation Et De Maintenance page 32

ENGLISH
PROBLEM
Motor does not reach the rated
speed
Motor runs in wrong direction
Motor overheated
Motor vibrates
Scraping noise
Noisy operation
Hot bearings
CAUSE
Supply voltage
Voltage too low at motor terminals
because of line drop
Overload
NOTE:
Overload
Failing ventilation
Wrong connections
Harmonic distortion
Motor misaligned
Weak support
Coupling out of balance
Driven equipment unbalanced
Defective bearings
Bearings not in line
Balancing weights shifted
Contradiction between balancing
of rotor and coupling (half key - full
key)
Fan rubbing fan cover
Loose on bedplate
Air gap not uniform
Rotor unbalance
Bent or sprung shaft
Excessive belt pull
Pulleys too far away from shaft
shoulder
Pulley diameter too small
Misalignment
Insufficient grease
ACTION
Check the level of the supply
voltage.
Use a higher voltage or transformer
terminals or reduce the load. Check
connections. Check conductors for
proper size.
Reduce the load or resize the
motor.
Exchange any two phases.
Pay attention if the motor is equipped
with an encoder since it can give the VSD
wrong information about the direction of
rotation.
Reduce the load or resize the
motor.
Clean the motor, the filters and the
grid of the fan motor. Check that
the fan is operating. Check for free
ventilation and cooling.
Check that no phase is incidentally
open or grounded.
High harmonic distortion in the
frequency converter output is not
allowed.
Realign.
Strengthen base.
Balance coupling.
Rebalance driven equipment.
Replace bearings.
Repair motor.
Rebalance rotor.
Rebalance coupling or rotor.
Correct fan mounting.
Tighten holding bolts.
Check and correct end shield fits or
bearing fits.
Rebalance rotor.
Straighten or replace shaft.
Decrease belt tension.
Move pulley closer to motor
bearing.
Use larger pulleys.
Correct by realignment of the drive.
Maintain the proper quality and
amount of grease in the bearing.
32