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5
Maintenance and Troubleshooting
5.1 Maintenance project and cycle
DANGER
1.
Please read “
1 Safety Precautions
” carefully before maintenance, and use a multimeter and other
instruments to detect the voltage between the metal parts that need to be touched and the metal parts that
may be in contact with the ground to avoid electric shock.
2.
When maintaining, please pay attention to the string inverter warning label, beware of high voltage and
personal injury.
3.
During maintenance, make sure that the DC input switch DC Switch is off, and the circuit breaker is
disconnected between inverter and grid.
4.
After the maintenance is completed, close the DC input switch of the inverter and the circuit breaker
between the inverter and the grid.
String inverters need to be regularly maintained. Common maintenance items and cycles are shown in
the table below.
Table 5-1 String inverter maintenance project and cycle
Check parts Check item Check item
Treatment
Inspection cycle
Overall
inspection
Appearance
Observe whether the inverter
appearance is damaged or deformed.
Please replace it in time
when it is serious.
Once every six
months to one
year.
System
cleaning
Is there any foreign body or dust on
the surface of inverter box?
Cleaning up foreign
matter and dust
The heat sink is covered with dust
and dirt.
Remove occlusion and
dust removal
System
running
Operating
status
Does the inverter have abnormal
noise during operation?
In case of seriousness,
please replace it in time. Once every six
months to one
year.
Operating
parameters
When the inverter is running, check
that the parameters are set correctly.
Exclude exception
settings
Connection
part
Fall off, loose
Check if the cable connection is
disconnected or loose.
Fasten the connection
as specified
Half a year after
the first
commissioning,
and once every six
months to one year
thereafter.
Damage
Check the cable for damage. Focus
on checking the surface of the cable
that is in contact with the metal
surface for traces.
In case of seriousness,
please replace it in time.
Terminal
Check if the waterproof cover of the
unused RS485 port is locked.
Guaranteed to be
sealed
Note: Before wiping the heat sink, turn off the inverter normally, then disconnect the circuit breaker between
the inverter and the grid, and then put the “DC SWITCH” of the inverter into the “OFF” state. After powering
off, wait at least 5 minutes before wiping the heat sink to avoid accidents.
5.2 Troubleshooting
Boost side
Fault word ID
Fault name
Fault/alarm reason
Troubleshooting
Fault word
1
0
Auxiliary power supply
overvoltage fault
±
12V of auxiliary power
supply is too high
Check if the auxiliary power
hardware signal is normal;
2
Output hardware
overvoltage
The output voltage exceeds
the protection point set by the
hardware.
1. Normal work after resetting.
2. If it occurs frequently, please
contact the Hopewind technician.
3
Hardware overcurrent
(secondary)
Unit inductor current is too
large
1. Normal work after resetting.
2. If it occurs frequently, please
contact the Hopewind technician.
