5-5
5.2 General troubleshooting
Status Checking point Remedy
Motor runs
in wrong
direction
Is the wiring for the output
terminals correct?
Wiring must match U, V, and W terminals of
the motor.
Is the wiring for forward and
reverse signals correct?
Check for correct wiring.
The motor
speed can
not be
regulated.
Is the wiring for the analog
frequency inputs correct?
Check for correct wiring.
Is the setting of operation mode
correct?
Check the Frequency
Source set in parameters 00-05/00-06.
Is the load too excessive? Reduce the load.
Motor
running
speed too
high or too
low
Check the motor specifications
(poles, voltage…) correct?
Confirm the motor specifications.
Is the gear ratio correct? Confirm the gear ratio.
Is the setting of the highest
output frequency correct?
Confirm the highest output frequency
Motor speed
varies
unusually
Is the load too excessive? Reduce the load.
Does the load vary excessively?
1. Minimize the variation of the load.
2. Consider increasing the capacities of the
inverter and the motor.
Is the input power erratic or is
there a phase loss ?
1. Consider adding an AC reactor at the power
input side if using single-phase power.
2. Check wiring if using three-phase power.
Motor can
not run
Is the power connected to the
correct L1(L), L2, and L3(N)
terminals?
is the charging indicator lit ?
1. Is the power applied ?
2. Turn the power OFF and then ON again.
3. Make sure the power voltage is correct.
4. 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?
See error descriptions to check wiring and
correct if necessary.
Is there a forward or reverse run
command ?
Has the analog frequency signal
been input?
1. Is analog frequency input signal wiring
correct?
2. Is voltage of frequency input correct?
Is the operation mode setting
correct?
Operate through the digital keypad
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