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GD270-200-4, Asynchronous motor water pump Application, fault phenomenon: operation reports UV. How to solve it?

Reason analysis: 

1 The static measurement main circuit is intact and the power display is normal.
2. After starting the VFD, observe that the fan does not rotate.
3. I cannot hear the sound of the contactor when I have repeatedly powered off the VFD.
4. The resistance of the contactor coil measured is normal, and the main contact is normal.
5. After replacing the power board, the contactor still does not operate.
6. Unplug 2 fan plugs, and the DC contactor will operate normally after power on.

Solution: After replacing the fan, it runs normally under load.

GD200A-18G-4

Application condition: Ordinary speed regulation for asynchronous motor drying equipment. 

Fault phenomenon: The frequency of the VFD does not increase after operation and reports overload. How to solve it?

Check the fault record for 6.6Hz/51V/68.8A. The static measurement of the main circuit using a multimeter shows no abnormalities. The clamp meter measures the actual current and the VFD display is consistent. Checking parameter P04.01=10.

Solution: Optimize torque boost parameter P04.01=1. The torque boost parameter P04.01 should be adjusted appropriately according to the actual situation, not the larger the better.

 GD350A-800G-6, Crusher application, 2 sets of 800kW VFDs drive 2 sets of 630KW motors. After the VFD is debugged, the trial production stage often reports  overload OL2. How to solve it?

The crusher is an impact load, and the stones processed by the equipment are blasted fastly, the size of the stone particles varies, and the impact of the load is uncontrollable, the maximum instantaneous current of the machine monitoring reaches 1800A, and the VFD selection is too small. 

Solution: Amplify the power of the VFD and ensure stable operation after being put into use.

After checking the wiring, it was discovered that one of the three power cables on the drive board was incorrectly connected to the V phase.
Solution: Replace the drive board of the VFD, IGBT，Correct the wiring.

 The END fault indicates the operating time has been reached, meaning the actual runtime of the inverter exceeds the internally set operating time. Check the cumulative operating time of the unit at P07.14 and contact the supplier or manufacturer for resolution.

The VFD keypad receives its 24V power supply from the switching power supply section of the drive board. You can check if the power supply is functioning properly by measuring the 24V and GND connections on the control board. If the 24V power supply is normal, replace the keypad or control board for testing, as the keypad may be damaged or the keypad cable may be loose. If the 24V supply is unstable, replace the switching power supply section. Please consult INVT professionals.

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.

The cooling fan for the inverter has a lifespan exceeding 25,000 operating hours. Actual service life depends on inverter usage and ambient temperature. Check the inverter's operating time via P07.14 (Cumulative Operating Time). An increase in bearing noise typically indicates impending fan failure.
Fan Replacement Guide:
1. Shut down the unit and disconnect the AC power supply. Wait for at least the time specified on the inverter. 
2. Use a screwdriver to pry the fan mounting plate from the cabinet, then lift the plate upward. Disconnect the fan cable from the terminal block.
3. Remove the fan cable and take out the fan mounting plate.
4. Reinstall the fan mounting plate onto the VFD in reverse order. Ensure the fan's airflow direction aligns with the VFD's airflow direction.

PWR (Red LED)
Power indicator. Solid red when powered on.
DATA (Yellow LED)
Data indicator. Solid when connected to 4G network. Slow flash when not connected to server. Fast flash when connected to server. 
LINK (Green)
Signal indicator: Steady on for normal signal strength, slow flashing for weak signal, off for no signal, fast flashing during data exchange.