Replace motor with one of
proper duty rating
No
Yes
Correct connection
Does it happen during
acceleration ?
Increase the accel / decel
time
No
Are the output
voltages between
U,V, and W terminals
the same?
No
N3 fault
Motor overheats
Yes
Yes (Within ± 3% of the rated output voltage)
Fig. 22.6 Motor Instability
Is the load or current
exceeding the the inverter
rating ?
Reduce the load or increase
the inverter and / or the motor.
Yes
Is the the motor
running at low speed
for an extended time ?
No
Yes (Within ± 3% of the nominal value)
Is there output voltage
to the U,V, and W
terminals ?
N3 fault
Is there anything
obstructing motor
cooling ?
Yes
Remove obstruction.
Faulty connection
between N3 and motor
Yes
No
No
Is acceleration time
correct ?
No
Reduce the load or increase
the inverter and / or the motor.
Yes
Is the load fluctuating?
Reduce the load fluctuation or
add a flywheel.
Yes
Is there any
mechanical vibration
or gear backlash ?
No
Yes
Inspect mechanical system
and correct
N3 fault
Minimal
Fig. 22.5 Motor Overheating
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