reset the "Insulation Resistance
Protection Point".
Inverters for the Australian and New
Zealand markets can also be alerted in
the following ways in the event of
insulation impedance failure:
1. The inverter is equipped with the
buzzer: the buzzer sounds
continuously for 1 minute in case of
failure; if the fault is not resolved, the
buzzer sounds every 30 minutes.
2. Add the inverter to the monitoring
platform, and set the alarm reminder,
the alarm information can be sent to
the customer by emails.
Abnormal system
grounding/
F19:System
grounding abnormal
1. The PE cable of the
inverter is not
connected.
2. When the output
of the photovoltaic
string is grounded,
the AC output
cables L and N of
the inverter are
connected
reversely.
1. Please confirm if the PE cable of the
inverter is properly connected.
2. If the output of the photovoltaic string
is grounded, please confirm whether
the AC output cables L and N of the
inverter are reversely connected.
Anti-reverse power
Failure/
F20:Hardware
Reverse Current
Protection
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.
Internal Comm Loss/
F21:Internal comm
loss
1. Frame format error
2. Parity checking
error
3. Can bus offline
4. Hardware CRC
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.