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Model: IPE300-090G-4

Application condition: Ordinary speed regulation of washing machine. 

Fault phenomenon: After the VFD is powered on, the display screen flashes once and then goes out, repeating the cycle. 

How to solve it?

Reason analysis: 

The static measurement main circuit is intact. Measure that there is no 10V or 24V voltage at the motherboard terminals when powered on. Disassemble and inspect the U-phase circuit of the drive board. There is a voltage regulator tube that has changed color. Check for abnormal IGBT junction capacitance corresponding to phase U. Analysis shows that the short circuit at the IGBT trigger end resulted in the protection of the switch power supply on the drive board. 

Solution:

 Replace with a new driver board and U-phase IGBT. 

Improvement effect: 

The motherboard displays normally and the motor runs normally.

Model: GD270-220-4 

Application conditions: General application of water pump speed regulation. 

Fault phenomenon: There is abnormal noise and smoke during the VFD operation for a period of time, and the front switch trips. 

How to solve it?

 Reason analysis: 

Static measurement shows an open circuit in the inverter bridge section. There is no obvious abnormality in the waveform of the power grid measured by the oscilloscope. Upon disassembling the machine, metal conductive dust was found inside. The dust caused the positive and negative busbars to ignite and discharge under the action of the fan, resulting in a short circuit current during ignition and damage to the inverter module. 

Solution:

 Improve the environment and regularly clean up dust. Install insulation tape between the positive and negative busbars to strengthen insulation.

Improvement effect: 

Stable operation.

Model : IPE300

Application condition: asynchronous motor long cable application. 

Fault phenomenon: Some output reactors have a temperature of 90℃, while the reactors change color. 

How to solve it?

Cause analysis: 

Check the motor cable for approximately 100-400 meters. Check that the carrier frequency of theVFD is set to 3-8kHz. Check the nameplate of the reactor to see if it is suitable for a carrier frequency of 2kHz. 

Solution: 

Optimize the carrier frequency of the VFD and reduce it to 2kHz for carriers with severe heating. 

Improvement effect: 

Reduce the temperature of the output reactor from 90℃ to 60 ℃

VFD Model: GD350A-004G-4

Application: Sewage mixer synchronous motor speed regulation. 

Fault phenomenon: The motor shakes and makes abnormal sounds after operation. 

How to solve it?

Cause analysis: 

Check that the motor parameters are correct. Check that there are no mechanical faults in the motor and load. Measure the voltage balance of the three-phase output of theVFD and confirm that there are no hardware issues. 

Solution: 

Comprehensive static autotuning of motor parameters. Optimize P00.00 speed control mode and change to SVC0 operation. Improvement effect: Eliminating motor noise and vibration.

VFD Model:  GD350A-075G/090P-4，

Application: Asynchronous motor ordinary speed regulation, 

Fault phenomenon: The VFD immediately reports ETH1 fault when powered on. 

How to solve it?

Cause analysis: 

The keypad cannot be reset, indicating that the fault persists. After power-off inspection, it was found that the terminal block motor wire was connected to the wrong position. 

Solution: 

Correct the motor wiring to UVW and ensure normal operation.

VFD Model: GD350A-037G/045P-4

Application: Asynchronous motor ordinary speed regulation

Fault phenomenon: dozens of VFDs in the same workshop report ITE and cannot be reset.

 How to solve it?

Reason analysis: 

The main circuit of the static measurement VFD is good. The power transmission display screen reports that ITE cannot be reset, indicating that the fault persists. Disassemble and inspect the current detection circuit on the back of the drive board for black dust. 

Solution: 

Clean the dust in the current detection circuit with alcohol. Improvement effect: ITE fault is eliminated, and the VFD works normally under load.

Inverter Model: GD200A-075G-4 

Application condition: Ordinary asynchronous motor speed regulation for blow molding machine

Fault phenomenon: output phase loss reported after several months of operation. 

How to solve it?

Cause analysis: 

The main circuit of the VFD was found to be normal. The output voltage of the VFD measurement without connecting the motor is normal. Immediately run and report SPO after connecting the motor. Upon investigation, it was found that there was a cabinet between the VFD and the motor where the coil of an output reactor had burnt out and discolored.

Solution: Replace the reactor and ensure normal operation.

GD350-055G-4， 

Application: asynchronous motor ordinary speed regulation

Fault phenomenon: output phase loss reported after running for a period of time. 

How to solve it?

Cause analysis: 

Check that there are no abnormalities in the motor and the cables connecting the VFD to the motor. Measure the abnormality of the VFD main circuit. Disassemble and inspect the W-phase plastic shell for melting and discoloration of the copper bars. Continuing the inspection, it was found that one screw of the W-phase copper bar was loose. 

Solution: 

Replace with new components IGBT, copper bars, and chassis. 

Improvement effect: Running normally.

GD20-7R5G-4

Application: polishing machine. 

Fault phenomenon: The VFD operation data displayed on the HMI is lagging and the response is slow. 

How to solve it?

Reason analysis: 
Sort out the on-site control logic: PLC reads the operation data of 3VFDs through 485 communication, and then sends it to the HMI for display.

Check that multiple 485 communication lines and motor cables are bundled together in the electrical cabinet. Check that the VFD is well grounded.

Solution: 

Organize the cables and keep the 485 communication cable away from the motor cable to prevent interference.

Optimize the carrier frequency P00.14 to reduce external interference caused by VFD. 

Install collision rings on communication cables to enhance the anti-interference ability of signal cables. 

Improvement effect: interference elimination, smooth data display on the HMI.