Chapter 5 Troubleshooting and maintenance
5-6
5.2 General troubleshooting
Status Checking point Remedy
Is power applied to L1, L2, and L3 terminals (is
the charging indicator lit)?
‧Is the power applied?
‧Turn the power OFF and then ON again.
‧Make sure the power voltage is correct.
‧Make sure screws are secured firmly.
Is there voltage across the output terminals T1,
T2, and T3?
‧Turn the power OFF and then ON again.
Is overload causing the motor to stall? ‧Reduce the load so the motor will run.
Are there any abnormalities in the inverter?
Is forward or reverse run command issued?
‧See error descriptions to check wiring
and correct if necessary.
Has the analog frequency signal been input?
‧ Is analog frequency input signal wiring
correct?
‧Is voltage of frequency input correct?
Motor can
not run
Is the operation mode setting correct?
‧Operate through the digital keypad .
Are wiring for output terminals T1, T2, and T3
correct?
‧Wiring must match U, V, and W
terminals of the motor.
Motor runs
in wrong
direction
Are wiring for forward and reverse signals
correct?
‧Check for correct wiring.
Is the wiring for the analog frequency inputs
correct?
‧Check for correct wiring.
Is the setting of operation mode correct?
‧Check the operation mode of the
operator.
The motor
speed can
not be
regulated.
Is the load too excessive? ‧Reduce the load.
Check the motor specifications (poles,
voltage…) correct?
‧Confirm the motor specifications.
Is the gear ratio correct? ‧Confirm the gear ratio.
Motor
running
speed too
high or too
low
Is the setting of the highest output frequency
correct?
‧Confirm the highest output frequency.
Is the load too excessive? ‧Reduce the load.
Does the load vary excessively?
‧Minimize the variation of the load.
‧Increase capacities of the inverter and the
motor.
Motor speed
varies
unusually
Is the input power erratic or is a phase loss
occurring?
‧Add an AC reactor at the power input
side if using single-phase power.
‧Check wiring if using three-phase power.
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