37
User Manual V1.0-2022-08-20
09 Maintenance
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
fluctuation 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 offline
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.
