3GZF500730-70 rev. C RU-EN 01-2016 | ABB Motors and Generators EN – 47
TROUBLE CAUSE WHAT TO DO
Motor takes too long
to accelerate and/or
draws high current
Excessive load Reduce load.
Low voltage during start Check for high resistance. Make sure that an adequate
cable size is used.
Defective squirrel cage rotor Replace with a new rotor.
Applied voltage too low Correct power supply.
Wrong rotation
direction
Wrong sequence of phases Reverse connections at motor or at switchboard.
Motor overheats
while running
Overload Reduce load.
Frame or ventilation openings may
be full of dirt and prevent proper
ventilation of motor
Open vent holes and check for a continuous stream of
air from the motor.
Motor may have one phase open Check that all leads and cables are well connected.
Grounded coil Motor must be rewound.
Unbalanced terminal voltage Check for faulty leads, connections and transformers.
Motor vibrates Motor misaligned Realign.
Weak support Strengthen base.
Coupling out of balance Balance coupling.
Driven equipment unbalanced Rebalance driven equipment.
Defective bearings Replace bearings.
Bearings not in line Repair motor.
Balancing weights shifted Rebalance rotor.
Contradiction between balancing
of rotor and coupling (half key – full
key)
Rebalance coupling or rotor.
Poly-phase motor running single
phase
Check for open circuit.
Excessive end play Adjust bearing or add shim.
Scraping noise Fan rubbing end shield or fan cover Correct fan mounting.
Loose on bedplate Tighten holding bolts.
Noisy operation Air gap not uniform Check and correct end shield fits or bearing fits.
Rotor unbalance Rebalance rotor.
To Next Page
Loading...
Need help?
General
