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Star Connection
Troubleshooting For Three Phase Motors
Motor service and any troubleshooting must be handled by qualified persons who have proper tools
and equipment. Before rectifying any faults, please read the information in the section titled Safety
Information.
Defect
Motor does not start
Motor stalls
Motor takes a long time
to gain speed
Motor runs and die
down
Wrong rotation direction
Motor heats up
excessively
Cause
Blown fuses
Incorrect line connections
Motor overloaded
Mechanical damage
One of the phases may be
open
One of the phases may be
open.
Improper motor selection.
Overload.
Low voltage.
Open power supply or control
circuit.
Low voltage
Over loading
Rotor damaged
Incorrect converter settings
Power failure
Wrong sequence of phases
Motor overloaded
Low voltage
Ambient temperature is too
high
Insufficient cooling
Bearing failure
Unbalanced voltage
EN
Delta Connection
Replace the fuses with correct one with rated
value
Check the connections
Decrease the load
Check whether the motor and drive rotate freely
Check the phases on the line
Check if there is a broken phase on the lines
Change the type or size. Contact the device's
supplier or designer.
Decrease the load
Check whether the voltage stated on the rating
plate is maintained. Check the connection.
Blown fuses, check the load relay, stator and
control buttons.
Check the circuit capacity and power source
Decrease the load
Replace the rotor
Correct the settings
Check for a loose connection in the power supply
line, fuses and control.
Reverse connections at terminals
Decrease the load
Adjust motor to supply voltage
Observe the permitted temperature range,
decrease the load if necessary or
Check the insulation class and use appropriate
special motor
Provide air cooling supply, clean cooling air
passages
Replace the bearings
Check the circuit
Solution
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