User Manual
36
Fault word
ID
Name of failure /
alarm
Fault/alarm reason
Troubleshooting
8
Grid overfrequency
The grid frequency exceeds
the over-frequency point set
by the system
1. Check whether there is a fault
such as a box trip on the AC side of
the inverter through fault recording
and event recording.
2. Confirm the frequency range and
confirm the time setting is
reasonable.
9
Grid underfrequency
The grid frequency is lower
than the underfrequency point
set by the system
1. Check whether there is a fault
such as a box trip on the AC side of
the inverter through fault recording
and event recording.
2. Confirm the frequency range and
confirm the time setting is
reasonable.
11
Island effect protection Loss of power in the grid
Detecting the cause of grid voltage
loss, such as box tripping, etc.
。
13
Grid voltage anomaly Grid voltage abrupt change
Confirm that the grid is normal
14
Low voltage ride
through protection
Grid voltage exceeds low
penetration protection
threshold
Confirm that the grid is normal
15
High voltage ride
through protection
Grid voltage exceeds high
wear protection threshold
Confirm that the grid is normal
Inverter fault
status word
0
Module A phase
software overcurrent
Inductor current RMS
exceeds protection threshold
Fault reset
1
Module B phase
software overcurrent
Inductor current RMS
exceeds protection threshold
Fault reset
2
Module C phase
software overcurrent
Inductor current RMS
exceeds protection threshold
Fault reset
3
Module current
imbalance
Three-phase current
imbalance exceeds the
threshold
Confirm that the grid is normal
5
Module temperature is
too high
The radiator temperature is
higher than the protection
threshold.
Confirm that the spoiler fan is
normal
6
High temperature
inside the machine
Ambient temperature is
higher than protection
temperature.
Confirm that the spoiler fan is
normal
9
Residual current
abnormality
Residual current overrun
1. If it happens accidentally, it may
be caused by the accidental
abnormality of the external line.
After the fault is cleared, it will
resume work without manual
intervention.
2, if frequent or long time can not be
restored, please check whether the
PV impedance is too low.
Bus fault
word status
1
Bus operation short
circuit
Bus voltage drop overrun
Detecting whether the bus bar is
short circuited
5
Bus overrunning
The bus voltage exceeds the
set threshold.
1, check whether the hardware
related to bus voltage sampling is
normal.
2, confirm the DC source or battery
panel configuration is normal.
6
Bus operation under
voltage
The bus voltage is below the
set threshold.
1, check whether the hardware
related to bus voltage sampling is
normal.
2, detect whether the bus bar has
short circuit and other faults.
7
The bus voltage is
unbalanced.
Positive and negative bus
voltage imbalance exceeds
the set threshold.
1, check whether the hardware
related to bus voltage sampling is
normal.
2, detect whether the bus bar has
short circuit and other faults.
