48
09 Maintenance User Manual V1.4-2022-08-30
No. Fault Cause Solutions
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.
19
Abnormal
Ground
1. The PE cable of
the inverter is not
connected well.
2. The L cable
and N cable
are connected
reversely when
output of the
PV string is
grounded.
1. Check whether the PE cable of the inverter is
connected properly.
2. Check whether the L cable and N cable are
connected reversely if output of the PV string
is grounded.
20
Anti Reverse
power Failure
Abnormal
uctuation of load
1. If the exception is caused by an external fault,
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.
21
Internal Comm
Loss
1. Frame format
error
2. Parity checking
error
3. Can bus oine
4. Hardware CRC
error
5. Send (receive)
control bit is
receive (send).
6. Transmit to the
unit that is not
allowed.
Disconnect the AC output switch and DC input
switch, then connect them 5 minutes later.
Contact the dealer or the after-sales service if
the problem persists.
22
AC HCT Check
abnormal
The sampling of the
AC HCT is abnormal.
Disconnect the AC output switch and DC input
switch, then connect them 5 minutes later.
Contact the dealer or the after-sales service if
the problem persists.
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