Chapter 8 Troubleshooting and Countermeasures
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8.2 Common Fault and Resolutions
During the inverter using process, the following faults may occur. Please conduct simple fault
analysis by referring to the methods below:
1ˊNo display upon power-on
1) Check whether the inverter input power supply is consistent with the inverter rated voltage
with universal meter. If there is any fault of power supply occurs, please check the power supply
and eliminate the fault.
2) Check if the three-phase rectifier is intact. If the rectifier cracks, please seek for service.
2. The power supply circuit breaker trips off upon power on.
1) Check if the input power supplies are grounded or there is short circuit, solve the problem.
2) Check if the rectifier is breakdown. If it is damaged, please seek for service.
3. The motor does not rotate upon Inverter running.
1) Check if there is balanced three-phase output among U, V and W. If there is, it is caused by
motor circuit or motor damage, or blacked due to mechanical reasons. Please eliminate the fault.
2) If there is output, but the three phases are not balance, it shall be caused by the damage of
inverter drive board or output module, please seek for service.
3) If there is no output voltage, it may be caused by the damage of drive board or output
module, please seek for service.
4. The inverter displays normal upon power on, but the circuit breaker of power supply trips off
during the running process:
1) Check if there is short circuit among the output modules. If there is, please seek for service.
2) Check if there is short circuit among the motor lead wires, or they are grounded. If there is,
please eliminate the fault.
3) If the trip occurs sometimes and the motor is far away from the inverter, adding output AC
reactor shall be considered.
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