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9-8
Symptom Probable cause Countermeasure
Overload
(Electronic
thermal
trip)
(Low
frequency
zone)
Is the torque boost too high ?
Do the electronic thermal characteristics
match the set characteristics of the
motor ?
Decrease the torque boost.
Reset the electronic thermal characteristics
and level.
Is the input voltage high ?
Is the equipment stopped with the
inverter DC voltage increased after
sudden deceleration ?
Lower the input voltage.
Set a deceleration time which is a little longer.
Increase the AVR set value above the current
input voltage and lower the V gain by
the ratio.
The input
voltage
trips.