Fault Analysis: There is no DC input, and the inverter LCD is powered by DC.
(1) The component voltage is not enough. The working voltage of the inverter is 100V to 500V. When it is lower than 100V, the inverter will not work. Module voltage is related to solar irradiance.
(2) The PV input terminals are connected reversely. The PV terminals have positive and negative poles, which must correspond to each other and cannot be connected reversely with other groups.
(3) The DC switch is not closed.
(4) When the components are connected in series, a certain connector is not connected properly.
(5) One component is short-circuited, causing other strings to fail to work.
Use a multimeter to measure the DC input voltage of the inverter. When the voltage is normal, the total voltage is the sum of the voltages of each component. If there is no voltage, check whether the DC switch, terminal blocks, cable connectors, components, etc. are normal. If there are multiple components, they should be connected and tested separately.
2. Symptom: The inverter is not connected to the grid.
Fault analysis: the inverter is not connected to the grid,
(1) The AC switch is not closed.
(2) The AC output terminal of the inverter is not connected.
(3) During wiring, the upper row of inverter output terminals was loosened.
Solution: Use a multimeter to measure the AC output voltage of the inverter. Under normal circumstances, the output terminal should have a voltage of 220V or 380V. If not, check whether the terminal is loose, whether the AC switch is closed, and whether the leakage protection switch is broken. open.
3. Inverter hardware faults: divided into recoverable faults and non-recoverable faults.
Fault analysis: Inverter circuit board, detection circuit, power circuit, communication circuit and other circuits are faulty.
Solution: If the above-mentioned hardware failure occurs in the inverter, please disconnect the DC terminal and the AC terminal, and let the inverter be powered off for more than 30 minutes. If it can be recovered, continue to use it. If it cannot be recovered, please contact the after-sales technical engineer.
4. Fault phenomenon: AC side overvoltage.
The impedance of the grid is too large, and the user side of photovoltaic power generation cannot digest it. When it is transmitted out, the impedance is too large, causing the voltage on the output side of the inverter to be too high, causing the inverter to shut down for protection or derated operation.
(1) Increase the output cable, because the thicker the cable, the lower the impedance;
(2) The inverter is close to the grid connection point, the shorter the cable, the lower the impedance.
5. Fault phenomenon: Inverter ground fault.
(1) Fault analysis: the external environment is humid, and the insulation of the inverter to the ground is reduced
Solution: Turn on the fan for dehumidification.
(2) Fault analysis: Inverter detection board fault
Solution: replace the inverter detection board
(3) Failure analysis: IGBT failure
Solution: replace the IGBT board
(4) Fault analysis: Grounding fault of the DC cable from the combiner box to the inverter
Solution: Find the grounding point of the cable, handle or replace the cable on the spot
6. Fault phenomenon: The inverter frequently falsely reports faults.
Failure analysis: detection board failure
Solution: Replace the detection board or cable
7. Fault phenomenon: The inverter cannot start normally.
Fault analysis: Check whether the cooling fan is normal, check whether the IGBT is normal, check whether the main board is normal, and check whether the DC voltage is normal.
Solution: replace the damaged components according to the actual situation
8. Fault phenomenon: SPD fault alarm.
Failure analysis: damage to the lightning arrester
Solution: Replace the lightning protector with a new one. If the fault occurs many times, contact the manufacturer.