Alarm Attribute

Possible Cause

Suggestion

1. Check whether the number of PV modules connected in series to this PV string is less than the number of PV modules connected in series to the other PV strings connected in parallel with this PV string. If yes, wait until the PV string current drops to below 0.01 A, set DC SWITCH to OFF, and adjust the number of PV modules in the PV string.
2. Check whether the PV string is shaded.
3. Check whether the open-circuit voltage of the PV string is normal.
4. Check whether PV modules in the PV string are connected in reverse polarity.
5. The following is the mapping between PV strings and alarm cause IDs: [IDs 1–n correspond to PV strings 1–n respectively.]