Frequency converter common fault analysis and countermeasures - Database & Sql Blog Articles

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one. Cause of overcurrent: The output current of the inverter exceeds the overcurrent detection value (about 200% of the rated current).
Solution: Check if the input three-phase power supply is out of phase or unbalance. Check if there is a phase-to-phase short circuit between the motor terminals (U, V, W) or short circuit to the ground. Check the motor cable (including phase sequence).
Check the encoder cable (including phase sequence)
Check if the motor power matches. Check if the motor cable contains power factor correction capacitor or surge absorber. Check if the electromagnetic switch installed on the output side of the inverter is malfunction. Check the acceleration time of the inverter. Check the inverter's parameter setting (motor related parameters). )

two. Cause of overload: The output current of the inverter exceeds the rated load capacity of the motor or inverter (about 160% of the rated value).
Solution: Check if the load is too heavy. Check if the inverter output is balanced. Check whether the motor cable contains power factor correction capacitor or surge absorber. Check if the electromagnetic switch installed on the output side of the inverter is malfunctioning. Check the acceleration time of the inverter. Check the inverter's parameter settings (motor related parameters)

three. Cause of overvoltage: The DC voltage of the intermediate circuit of the inverter is higher than the limit value of the overvoltage.
Inverter input voltage range 3*200-240VAC 3*380-500VAC 3*550-600VAC
Overvoltage limit of approximately 425VDC approximately 855VDC approximately 975VDC
Solution: Check if the power supply voltage is within the specified range?
Check if the deceleration time of the inverter is set too short, such as too short, to extend the deceleration time.
Is the brake unit used correctly?
Reduce load inertia or amplify inverter capacity

four. Cause of undervoltage: The DC voltage of the intermediate circuit of the inverter is lower than the limit of the undervoltage.
Inverter input voltage range 3*200-240VAC 3*380-500VAC 3*550-600VAC
Undervoltage limit is about 211VDC, about 402VDC, about 557VDC
Solution: Check if there is power failure, instantaneous power failure, main circuit device failure, poor contact, etc. Check if the power supply voltage is within the specified range. Check whether the power supply transformer capacity is suitable. Check whether there is a load with large starting current in the system.

Fives. Ground fault cause: The ground current on the output side of the inverter exceeds the setting value of the inverter.
Solution: Check the ground insulation of the motor and check the insulation of the motor cable.

six. Input power supply phase loss reason: The DC link voltage fluctuation of the inverter is too large.
Solution: Check the supply voltage of the inverter, is there a phase loss?
Check if the input three-phase power voltage imbalance is more than 4%?
Check if the load fluctuation is too large. Check if the three-phase input current of the inverter is balanced. If the three-phase voltage is balanced but the current is unbalanced, the inverter is faulty. Please contact the manufacturer. Reason for output phase loss: The inverter detects that there is no output current in one phase, and the other two phases have current.
Solution: Check the motor Check the wiring between the inverter and the motor Check whether the three-phase output voltage of the inverter is balanced.

Eight. Cause of overheating fault: The temperature of the radiator of the inverter exceeds the setting value of the inverter.
Solution: Check if the ambient temperature exceeds the standard. Check whether the cooling fan of the inverter works normally. Check whether the heat dissipation air duct is blocked or not. Check the temperature display value of the inverter radiator.

nine. Internal fault of the inverter Cause: The internal self-test of the inverter reports that the electronic components are damaged.
Solution: Power off and then power on, see if the fault can be reset. If the fault persists, damage the inverter, please contact the manufacturer.