34
User Manual V1.0-2022-08-20
09 Maintenance
No. Fault
Cause
Solutions
4
Grid
Undervoltage
The grid voltage
is lower than
the permissible
range, or the
duration of low
voltage exceeds
the requirement of
LVRT.
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 undervoltage protection
threshold, LVRT or disable the
undervoltage protection function after
obtaining the consent of the local
power company if the grid frequency is
within the permissible range.
3.
Check whether the AC breaker and the
output cables are connected securely and
correctly if the problem persists.
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 10min overvoltage
protection threshold with the consent
of the local power company if the grid
voltage is within the permissible range.
