41
User Manual V1.0-2022-05-10
09 Maintenance
No� Fault
Cause
Solutions
5
Isolation Fail
1. The PV system is
short-circuited
to the ground.
2. The PV system
is in a moist
environment
and the circuit
is not well
insulated to the
ground.
1. Check whether the PV input cables are broken.
2. Check whether the module frames and the metal
bracket are securely grounded.
3. Check whether the AC side is properly grounded
Inverters sold in Australia and New Zealand will also alarm
as following when Isolation Fail occurs.
1. The buzzer in the inverter will sound for 1minute. If the
problem persists, the buzzer willsound every 30 min.
2. After adding the inverter to Power Sight, the alarm
information will be emailed to the customers via Power
Sight.
6
DC inject
High
DC injection
exceeds the
allowed range.
1. Check whether the software version is the latest
one.
2. Restart the inverter and check whether the
inverter can work properly.
7
Ground I Fail
The input
insulation
impedance to the
ground decreases
when the inverter
is operating.
1. Check whether the working environment of the
inverter meets the requirements. For example,
the fault may occur due to high humidity on rainy
days
2. Make sure that the components are properly
grounded and the AC side is properly grounded.
8
PV Over
Voltage
Excess PV modules
are connected in
the series, and
the open-circuit
voltage is higher
than the operating
voltage.
1. Check whether the PV string input voltage
consistent with the value displayed on the LCD.
2. Check whether the PV string voltage meets the
maximum input voltage requirements.
9
Over
Temperature
1. The inverter is
installed in a
place with poor
ventilation.
2. The ambient
temperature is
too high.
3. The inverter
is working
improperly.
1. Check the installation environment and space of
the inverter. Make sure that the ventilation meets
heat dissipation requirements.
2. Make sure that the fans are working properly and
not covered or blocked.
3. Check whether the operating ambient
temperature is too high.
