1. If installation is new then please check connectivity is proper or not of AC gland make sure AC cable connect properly in connector terminal only. (The polarity is clearly mentioned on AC gland).
2. Check how often the error happens. If only one or two times a day, then it’s caused by the unst able Grid. If error is continuous then refer below mentioned steps.
3. Measure the Grid voltages at the AC connectors to make sure there is voltage properly coming on connector.
4. Check the loose contact in the AC connector, ACDB, and meter side.
5. If suspecting loose contact please properly connect the cable after disconnect from connector or ACDB.
6. If system is three phase (Check AC side voltage Phase to Phase, phase to neutral and neutral to earthing.) Always check reading from inverter AC gland end.
7. If system is single phase (Check AC side voltage Phase to neutral, phase to earthing and neutral to earthing.) Always check reading from inverter AC gland end.
8. Check V_Bus and H_V bus voltage.
9. Take complete reading of information menu like DC1, DC2, DC3, DC4 then VA, VB, VC or VGrid then Status (Error) and Total energy.
10. Take reading from advance info Alarm messages, version, running messages, warning messages.
11. Take ACDB, DCDB close and clear photo, inverter serial no. which is stick on inverter body and inverter complete installation photo.
12. Please check the VOC of all of the PV strings (Voltage should check from connector end after disconnect string from inverter).
13. Use a multi-meter to check the voltages between PV+ and earth, PV- and earth of all the PV strings. It should be decreasing from values between 5% and 95% of single PV module Voc. If voltage stuck on above single module VOC or in decreasing condition if voltage getting increase that means there is some fault with that strings.
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