64
09 Maintenance
User Manual
V1.0-2023-10-30
No�
Fault
Cause
Solutions
10
LVRT
Undervoltage
Utility grid exception.
The duration of the
utility grid exception
exceeds the set time
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 frequency is within the
permissible range. If not, contact the local
power company. If yes, contact the dealer or
the after-sales service.
11
HVRT
Overvoltage
Utility grid exception.
The duration of
utility grid exception
exceeds the set time
of HVRT.
12
Abnormal GFCI
30mA
The input insulation
impedance becomes
low when the
inverter is working.
1. If the problem occurs occasionally, it may be
caused by a cable exception. The inverter
will recover automatically after the problem is
solved.
2. Check whether the impedance between the
PV string and PE is too low if the problem
occurs frequently or persists.
13
Abnormal GFCI
60mA
14
Abnormal GFCI
150mA
15
Abnormal GFCI
16
Large DC of AC
current L1
The DC component
of the output current
exceeds the safety
range or default
range.
1. If the problem is caused by an external fault
like a utility grid exception or frequency
exception, the inverter will recover
automatically after solving the problem.
2. If the problem occurs frequently and the PV
station cannot work properly, contact the
dealer or the after-sales service.
17
Large DC of AC
current L2
18
Low Insulation
Res.
1. The PV string is
short-circuited
to PE.
2. The PV system
is in a moist
environment and
the cable is not
well insulated to
the ground.
1. Check whether the resistance of the PV string
to PE exceeds 50kΩ. If no, check the short
circuit point.
2. Check whether the PE cable is connected
correctly.
3. If the resistance is lower on rainy days, please
reset the ISO.
