Ordinary Faults of Inverter And Their Solutions

Ordinary faults of inverter and their solutions

1.Fault symptom: The inverter screen is not displayed.

•  Fault analysis: There is no DC input, and the inverter LCD is powered by DC.

• Possible reasons:

(1) The component voltage is not enough. The working voltage of the inverter is 100V to 500V V. When it is lower than 100V, the inverter does not work. The module voltage is related to solar irradiance.

(2) PV input terminals are reversed, and PV terminals have positive and negative poles, which should correspond to each other and cannot be reversed in series with other groups.

(3) The DC switch is not closed.

(4) When the components are connected in series, one joint is not connected properly.

(5) One component is short-circuited, resulting in other groups of strings not working. Solution: Measure the DC input voltage of inverter with multimeter voltage range. When the voltage is normal, the total voltage is the sum of the voltages of all components. If there is no voltage, check whether the DC switch, terminal, cable connector and components are normal in turn. If there are multiple components, separate access tests should be conducted.

2. Fault phenomenon: the inverter is not connected to the grid.

• Fault analysis: the inverter is not connected to the power grid.

• Possible reasons:

(1) The AC switch is not closed.

(2) The AC output terminal of the inverter is not connected.

(3) When wiring, the upper row of inverter output terminals is loose.

l Solution: Measure the AC output voltage of the inverter with a multimeter voltage range. Under normal circumstances, the output terminal should have a voltage of 220V or 380V V. If not, check whether the terminal is loose, whether the AC switch is closed and whether the leakage protection switch is off in turn.

3. Hardware failure of inverter: it can be divided into recoverable failure and unrecoverable failure.

• Fault analysis: the inverter circuit board, detection circuit, power circuit, communication circuit and other circuits are faulty.

• Solution: In case of the above-mentioned hardware failure of the inverter, please disconnect all DC terminals and AC terminals, and let the inverter be blacked out for more than 30 minutes. If you can recover, continue to use it. If you can't recover, contact the after-sales technical engineer.

  
  

4. Fault symptom: AC side overvoltage.

• Fault analysis: The power grid impedance is too large for the photovoltaic power generation user side to digest, and when it is delivered, the voltage at the output side of the inverter is too high, causing the inverter protection to shut down or run at reduced rate.

• Solution:

(1) Increase the output cable, because the thicker the cable, the lower the impedance;

(2) When the inverter is close to the grid connection point, the shorter the cable, the lower the impedance.

5. Fault phenomenon: inverter grounding fault.

• (1) Fault analysis: The external environment is wet, and the insulation between inverter and ground is reduced.

• Solution: Turn on the fan for dehumidification.

•  (2) Fault analysis: The inverter detection board is faulty.

• Solution: Replace the inverter detection board.

• (3) Fault analysis: IGBT fault.

• Solution: Replace IGBT board.

• (4) Fault analysis: DC cable from the junction box to the inverter is grounded.

•  Solution: Find the cable grounding point and handle or replace the cable on the spot.

  
  

6. Fault phenomenon: The inverter frequently gives false alarms.

• Fault analysis: detection board fault

• Solution: Replace the detection board or cable.

  
  

7. Fault phenomenon: The inverter cannot be started normally.

• Fault analysis: check whether the cooling fan is normal, IGBT is normal, motherboard is normal, and DC voltage is normal.

• Solution: Replace the damaged components according to the actual situation.

  
  

8. Fault phenomenon: the lightning arrester gives an alarm.

• Fault analysis: the lightning arrester is damaged.

• Solution: Replace the lightning arrester with a new one. If the fault occurs many times, contact the ADAYO POWER manufacturer.