Goodwe ET Series User Manual page 58

09 Maintenance
No. Fault
Grid
7
Underfrequency
Grid Frequency
8
Instability
Cause
Utility grid
exception. The
actual grid
frequency is
lower than the
requirement of the
local grid standard.
Utility grid
exception. The
actual grid
frequency change
rate does not meet
the requirement
of the local grid
standard.
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User Manual V1.1-2022-12-20
Solutions
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.
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.