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User Manual V1.0-2022-08-20
09 Maintenance
No. Fault
Cause
Solutions
1
Utility Loss
1. Utility grid power
fails.
2. The AC cable is
disconnected, or
the AC breaker is
off.
1. The alarm is automatically cleared after
the grid power supply is restored.
2.
Check whether the AC cable is connected
and the AC breaker is on.
2
Grid Overvoltage
The grid voltage
exceeds the
permissible range,
or the duration
of high voltage
exceeds the
requirement of
HVRT.
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 overvoltage protection
threshold, HVRT or disable the
overvoltage 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.
3
Grid Rapid
Overvoltage
The grid voltage is
abnormal or ultra-
high.
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
allowed 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.
