62
09 Maintenance
User Manual V1.6-2024-03-20
No. Fault Cause Solutions
7
Grid
Underfrequency
Utility grid
exception. The
actual grid
frequency is
lower than 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 underfrequency protection
threshold or disable the underfrequency
protection function after obtaining the
consent of the local power company
if the grid frequency is within the
permissible range. Or close “Grid
Underfrequency” function.
8
Grid Frequency
Instability
Utility grid
exception. The
actual grid
frequency change
rate does not meet
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.
• Contact the dealer or the after-sales
service if the grid frequency is within the
permissible range.
9 Anti-islanding
The utility grid
is disconnected.
The utility grid
is disconnected
according to the
safety regulations,
but the grid voltage
is maintained due
to the loads.
1. Check whether the utility grid is
disconnected.
2. Contact the dealer or the after-sales
service.
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