53
09 Maintenance
User Manual V1.1-2022-12-20
No. Fault Cause Solutions
5
Grid 10min
Overvoltage
The moving
average of grid
voltage in 10min
exceeds the
range of safety
requirements.
1. If the problem occurs occasionally, the
utility grid may be abnormal temporarily.
The inverter will recover automatically
after detecting that the utility grid is
normal.
2. If the problem occurs frequently, check
whether the grid voltage is within the
permissible range.
• Contact the local power company if the
grid voltage exceeds the permissible
range.
• Modify the grid overvoltage rapid
protection threshold after obtaining
the consent of the local power
company if the grid voltage is within
the permissible range.
6
Grid
Overfrequency
Utility grid
exception. The
actual grid
frequency exceeds
the requirement
of the local grid
standard.
1. If the problem occurs occasionally, the
utility grid may be abnormal temporarily.
The inverter will recover automatically
after detecting that the utility grid is
normal.
2. If the problem occurs frequently, check
whether the grid frequency is within the
permissible range.
• Contact the local power company if the
grid frequency exceeds the permissible
range.
• Modify the overfrequency protection
threshold or disable the overfrequency
protection function after obtaining the
consent of the local power company
if the grid frequency is within the
permissible range.
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