46 – EN ABB Motors and Generators | 3GZF500730-70 rev. C RU-EN 01-2016
10. Troubleshooting
These instructions do not cover all details or variations in
equipment nor provide information for every possible
condition to be met in connection with installation, opera-
tion 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 CAUSE WHAT TO DO
Motor fails to start Blown fuses Replace fuses with proper type and rating.
Overload trips Check and reset overload in starter.
Improper power supply Check to see that power supplied agrees with motor
rating plate and load factor.
Improper line connections Check connections against diagram supplied with
motor.
Open circuit in winding or control
switch
Indicated by humming sound when switch is closed.
Check for loose wiring connections and ensure that all
control contacts are closing.
Mechanical failure Check to see if motor and drive turn freely. Check
bearings and lubrication.
Short circuited stator
Poor stator coil connection
Indicated by blown fuses. Motor must be rewound.
Remove end shields and locate fault.
Rotor defective Look for broken bars or end rings.
Motor may be overloaded Reduce load.
Motor stalls One phase may be open Check lines for open phase.
Wrong application Change type or size. Consult equipment supplier.
Overload Reduce load.
Low voltage Ensure the rating plate voltage is maintained. Check
connection.
Open circuit Fuses blown. Check the overload relay, stator and
push buttons.
Motor runs and then
dies down
Power failure Check for loose connections to line, fuses and control.
Motor does not
accelerate up to
nominal speed
Not applied properly Consult equipment supplier for proper type.
Voltage too low at motor terminals
because of line drop
Use higher voltage or transformer terminals or reduce
load. Check connections. Check conductors for proper
size.
Starting load too high Check the motor’s starts against “no load”.
Broken rotor bars or loose rotor Look for cracks near the rings. A new rotor may be
required as repairs are usually temporary.
Open primary circuit Locate fault with testing device and repair.
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