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3.5. General Troubleshooting Method
ABNORMALITY
Motor
inoperative
Motor operate in
opposite direction
Motor operation
speed fixed
Motor operation
at speed too
high or too low
Abnormal speed
variation at
operation
CHECK POINT
Is power source voltage delivered into L1,
L2 terminal (is the charging indicator
illuminated)?
Is there voltage output from output
terminal T1, T2 and T3?
If the loading too heavy to block motor?
Is there any abnormal condition of the
inverter?
Is the forward or reverse instruction
loaded?
Is the analog frequency setting loaded?
If the operation mode setting correct?
Is wiring on the output terminals T1, T2
and T3 correct?
Is the wiring for the forward and reverse
signals correct?
Is the wiring for analog frequency input
correct?
Is the operation mode setting correct?
Is the loading too heavy?
Is the specification of motor (poles,
voltage) correct?
Is the gear ratio correct?
Is the highest output frequency setting
correct?
Is the voltage on motor side reduced
extremely?
Is the loading too heavy?
Is the loading variation too large?
Is the input power source steady and
stable?
COUNTERMEASURE
Check if the power source switched on.
l
Turn power source OFF and then ON
l
again.
Reconfirm the power voltage level.
l
Check to see if the mounting screw
l
secured.
Turn power source OFF and then ON
l
again.
Reduce load to start motor.
l
Refer to malfunction handling
l
instructions to examine and correct
wiring.
Check to see if wiring for analog
l
frequency input signal is correct?
Check if the frequency input setting
l
voltage is correct?
Operate by digital?
l
Wiring should be in accordance with the
l
U, V, W terminals of motor.
Examining the wiring and correct it.
l
Examining the wiring and correct it.
l
Operation panel operation mode setting
l
check.
Reduce loading
l
Reconfirm motor specification.
l
Reconfirm gear ratio
l
Reconfirm highest output frequency
l
Reduce loading variation
l
Increase inverter and motor capacity
l
Install AC reactor on the power supply
l
input side
39
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