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 When P11.01 is enabled and a transient power-off occurs, bit 9 is set to 1 when the bus voltage is lower than the following values: 460VDC for 380VAC models; 240VDC for 220VAC models.

What are the differences and triggering conditions between P11.01 (Frequency drop at transient power-off)   and P11.16 (Automatic frequency-reduction during voltage drop) on GD28 drive?

Solution:

When P11.01 is enabled, in the event of a short-term bus voltage drop, the VFD will reduce its output frequency to brake the motor, in motor brake status, it will generate energy to maintain the bus voltage.

When P11.16 is enabled, when the bus voltage decreases, the VFD's output frequency will decrease synchronously. This applies to both VF and vector modes.

For the GD350A, versions 6.09/6.10 and 3.09/3.1 can be used directly with EtherCAT communication expansion cards without requiring the burning of dedicated communication software.

Control boards running version 6.09 or higher are different from those running 6.08 or lower. Control boards with 6.08 or earlier cannot be flashed with 6.09 or 6.10 software. Similarly, control boards running 6.09 or higher cannot be flashed with software versions 6.08 or earlier.

GD350 supports software programming via RS485 in software versions 6.00 and above.

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.