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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.
Summary of Contents for M2A series
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