Troubleshooting - ABB M2A Manual De Instalación E Usuario

9.

Troubleshooting

These instructions do not cover all details or variations in equipment nor provide for every possible condition to be met
in connection with installation, operation or maintenance. Should additional information be required, please contact the
nearest ABB Sales Office.
Motor troubleshooting chart
Your motor service and any troubleshooting must be handled by qualified persons who have the proper tools and
equipment.
TROUBLE
Motor fails to start
Motor stalls
Motor runs and then
dies down
Motor does not
accelerate up to
nominal speed
Motor takes too long
to accelerate and/or
draws high current
CAUSE
Blown fuses
Overload trips
Improper power supply
Improper line connections
Open circuit in winding or control
switch
Mechanical failure
Short circuited stator
Poor stator coil connection
Rotor defective
Motor may be overloaded
One phase may be open
Wrong application
Overload
Low voltage
Open circuit
Power failure
Not applied properly
Voltage too low at motor terminals
because of line drop
Starting load too high
Broken rotor bars or loose rotor
Open primary circuit
Excessive load
Low voltage during start
Defective squirrel cage rotor
Applied voltage too low
WHAT TO DO
Replace fuses with proper type and rating.
Check and reset overload in starter.
Check to see that power supplied agrees with motor
rating plate and load factor.
Check connections against diagram supplied with
motor.
Indicated by humming sound when switch is closed.
Check for loose wiring connections.
Also ensure that all control contacts are closing.
Check to see if motor and drive turn freely. Check
bearings and lubrication.
Indicated by blown fuses. Motor must be rewound.
Remove end shields and locate fault.
Look for broken bars or end rings.
Reduce load.
Check lines for open phase.
Change type or size. Consult equipment supplier.
Reduce load.
Ensure the rating plate voltage is maintained. Check
connection.
Fuses blown, check overload relay, stator and push
buttons.
Check for loose connections to line, to fuses and to
control.
Consult equipment supplier for proper type.
Use higher voltage or transformer terminals or reduce
load. Check connections. Check conductors for proper
size.
Check the motor's starts against "no load".
Look for cracks near the rings. A new rotor may be
required, as repairs are usually temporary.
Locate fault with testing device and repair.
Reduce load.
Check for high resistance. Make sure that an adequate
cable size is used.
Replace with new rotor.
Correct power supply.
Low voltage Ex motor manual 01-2007 | ABB Motors and Generators EN – 19