47
General Malfunction Examination Method
ABNORMALITY CHECK POINT COUNTERMEASURE
Is the power source voltage delivered to
L1, L2 terminal (is the charging indicator
illuminated)?
z Check if the power source on.
z Turn power source OFF and then ON
again.
z Reconfirm the power voltage level.
Is there voltage output from output
terminal T1, T2 and T3?
z Turn power source OFF and then ON
again.
Is the motor wired correctly? z Check motor wiring.
Is there any abnormal condition of the
inverter?
Motor
Inoperative
Is the forward or reverse instruction
loaded?
z Refer to malfunction handling
instructions to examine and correct
wiring.
Is the analog frequency setting loaded? z Check to see if wiring for analog
frequency input signal is correct?
Motor
Inoperative
If the operation mode setting correct?
z Check if the frequency input setting
voltage is correct?
Is wiring on the output terminals T1, T2
and T3 correct?
z Operate by digital?
Motor operate in
opposite direction
Is the wiring for the forward and reverse
signals correct?
z Wiring should be in accordance with the
U, V, W terminals of motor.
Is the wiring for analog frequency input
correct?
z Examining the wiring and correct it.
Is the operation mode setting correct? z Examining the wiring and correct it.
Motor operation
speed fixed
Is the loading too heavy?
z Check the Operation panel
Is the specification of motor (poles,
voltage) correct?
z Reduce loading
Is the gear ratio correct? z Reconfirm motor specification.
Is the highest output frequency setting
correct?
z Reconfirm gear ratio
Motor operation
at speed too
high or too low
Is the voltage on motor side reduced
extremely?
z Reconfirm highest output frequency
Is the loading too heavy? z Reduce loading variation
Is the loading variation too large? z Increase inverter and motor capacity
Abnormal speed
variation at
operation
Is the input power source steady and
stable?
z Install AC reactor on the power supply
input side
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