Frequency converter common fault analysis and solution

The use of frequency converters can save energy to a large extent, so the frequency converter has become popular in today's society. More and more users will encounter the fault condition of the inverter alarm trip in daily work, thus affecting the normal operation of the equipment. . In order to help customers better use the frequency converter and reduce equipment downtime, I will list the common faults and solutions of the nine-point inverter. I hope to help you.

one. overload
Cause: The output current of the inverter exceeds the rated load capacity of the motor or the inverter (about 160% of the rated value).

Solution: Check if the load is too heavy
Check if the inverter output three phase is balanced
Check if the power factor correction capacitor or surge absorber is included on the motor cable
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)

two. Overvoltage
Cause: The DC voltage of the intermediate circuit of the inverter is higher than the limit value of the overvoltage.

Inverter input voltage range 3*200-240VAC3*380-500VAC3*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
three. 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
Check the ground insulation of the motor cable
four. Undervoltage
Cause: The DC voltage of the intermediate circuit of the inverter is lower than the limit of the undervoltage.

Inverter input voltage range 3*200-240VAC3*380-500VAC3*550-600VAC

Undervoltage limit of about 211VDC is 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 if the power transformer capacity is suitable
Check if there is a load with a large starting current in the system
Fives. Input power phase loss
Cause: The DC link voltage fluctuation of the inverter is too large.

Solution: Check the power 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.
six. Overcurrent
Cause: 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 unbalanced
Check the motor terminal (U, V, W) circuit for phase-to-phase short circuit or short to ground
Check motor cable (including phase sequence)

Check the encoder cable (including phase sequence)

Check if the motor power matches
Check if the power factor correction capacitor or surge absorber is included on the motor cable
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)
Seven. Output phase loss
Cause: 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 if the three-phase output voltage of the inverter is balanced
Eight. Overheat fault
Cause: The temperature of the heatsink of the inverter has exceeded the setting value of the inverter.

Solution: Check if the ambient temperature exceeds the standard
Check if the cooling fan of the inverter works normally and the cooling air duct is blocked.
Check the temperature display value of the inverter heat sink
nine. Internal fault of the inverter
Cause: The internal self-test of the inverter reported that the electronic components were damaged.

Solution: power off and then power on, see if the fault can be reset
If the fault persists and the inverter is damaged, please contact the manufacturer.