25
after getting approval from local
power operators.
221 ~
226
Undervoltage
Important
Power grid voltage is much low
beyond allowable range.
Same solutions as power grid
overvoltage.
231 ~
236
O
verfrequency
Important
Power grid frequency is much high
beyond allowable range.
Same solutions as power grid
overvoltage.
241 ~
246
Underfrequency Important
Power grid frequency is much low
beyond allowable range.
Same solutions as power grid
overvoltage.
251 ~
253
Abnormal power
grid frequency
Important
The inverter detects that power grid
frequency is beyond allowable range
before grid-connected operating.
Same solutions as power grid
overvoltage.
261
Islanding
Important
Abnormal fluctuation happens on
power grid frequency
Check whether the power grid is
in islanding state or not.
262
Power grid
unbalance
abnormality
Important
Power grid unbalance exceeds the
allowable range.
Occasional occurrence may be
caused by short-term power grid
abnormality.
After
detecting
normal power grid, the inverter
will be restored to normal
operation
without
manual
intervention
.
263
FRT occurrence Prompt
Low voltage ride-through
(
LVRT)
and dropping happen on power grid
voltage
Prompt alarm will be emitted
when
LVRT
and
dropping
happen on power grid voltage, no
need for special treatment.
264
Reverse phase
sequence of
power grid
Prompt
Power grid ABC phase sequences
are connected reversely.
Adjust AB or BC or CA two-phase
connection.
301 ~
331
BOOST circuit
fault
Important
Abnormal external conditions result
in BOOST circuit protection inside
the inverter, the possible cause
includes:
ID
：
301~309
Drastic
variations
in
external
conditions of the inverter results in
excessive input current.
ID
：
311 ~ 316
Drastic
variations
in
external
conditions of the inverter results in
excessive input voltage.
ID
：
321 ~ 323
The Inverter detects that BOOST
temperature
exceeds
allowable
range.
ID
：
331
Soft start of Inverter BOOST fails.
The inverter makes real-time
monitoring of external working
conditions, and will be restored to
normal operation without manual
intervention
after fault fixed.
ID
：
321 ~ 323
Check whether the cables of
BOOST temperature sensor are
connected or not.
401 ~
491
Inverter circuit
fault
Important
Abnormal external conditions result
in inverter circuit protection inside the
inverter,
the
possible
causes
includes:
ID
：
401 ~ 416
Drastic
variations
in
external
conditions of the inverter results in
excessive output current.
ID
：
421~427
The inverter makes real-time
monitoring of external working
conditions, and will be restored to
normal operation without manual
intervention
after fault fixed.
ID
：
421 ~ 427
Check whether there is a short
circuit on the output cable of the
inverter or not.
