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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.

1. Immediately shut down the equipment safely and disconnect the power supply. Wait for at least the time specified on the inverter.

2. Replace the damaged capacitor. Bulging capacitors are irreversible and cannot be repaired; replacement is mandatory. Use a capacitor of the same model and specifications, or replace it with a capacitor board provided by INVT. Before removing the old capacitor, take a photo of its wiring configuration with your phone to ensure the new capacitor is connected correctly. Note the polarity (electrolytic capacitors are polarized). Carefully remove the old capacitor and securely install the new one. Ensure terminals are tightened to prevent poor contact and overheating.

3. Causes and Prevention

1) Excessive Ambient Temperature: Poor ventilation at the inverter installation site, high ambient temperature, or dust clogging the heat sink.
Countermeasure: Improve ventilation conditions, clean the cooling fan and air ducts, ensure sufficient space around the inverter, and install air conditioning or forced ventilation equipment if necessary.

2) Capacitor Aging: Capacitors are consumables with a limited lifespan (typically several years), and aging accelerates in harsh environments.
Countermeasure: For inverters reaching their service life or in critical applications, consider implementing preventive maintenance with regular inspections or capacitor replacements.

3) Harmonic currents or overvoltage: Unstable grid voltage, frequent emergency stops/starts, or significant load fluctuations can cause DC bus voltage fluctuations or generate substantial harmonics, intensifying capacitor heating.

Countermeasure: Monitor grid voltage. Install input reactors in locations with significant grid fluctuations.

4) Component failure: Issues like rectifier bridge malfunctions allowing AC leakage into the DC side can accelerate capacitor damage.
Countermeasure: After capacitor replacement, have a professional conduct a comprehensive inspection.

 FAF means Forced Communication Failure, probably not receiving AC input in AC mode, VFD wants to switch to AC input, but no AC input, also caused by the mode change. this is an early warning, not a fault. It means that you are using Hybrid power supply mode, but there is no AC input. You only need to connect the AC input, or change the mode back to mode 0.

Yes, after removing the STO expansion card, you need to set P08.63=0 (invalid STO function), and then change the position of the jumper cap on the control board.

GD350 can support Closed-loop vectorcontrol, need to use optional PG card. More details please see attached manual.

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It is mainly used to prevent silk folding. When the winding diameter is at a specific value, the trajectory of the first repeated action will achieve the effect of coincidence. Too many yarns overlap to form silk folding, which brings hidden dangers to the unwinding of the next process. Therefore, it is necessary to add swing frequency, which is equivalent to adding appropriate disturbance in the regular operation process.

Tension has a great impact on spinning forming, and different sizes of spindles have different requirements for tension. Therefore, different speeds should be set according to different processes and spinning stages to accurately meet the needs of tension.