4
A faulty grid
relay detec-
ted
The difference
between INV
voltage and
output voltage
exceeds limit.
1. Disconnect the inverter from the utility
grid and the PV array, and reconnect it
after LED turns off.
2. If the fault persists, measure the phase
to phase voltage and phase to zero and
zero to ground voltage with a multimeter
to ensure that the voltage is normal and
the zero to ground voltage value should
not be greater than 10V.
3. Disconnect the inverter from the utility
grid and the PV array, and reconnect it
after LED turns off. If this fault is still being
displayed, please contact service.
5
PV voltage
too high
When the PV
voltage of any
circuit is greater
than 1020V, it is
determined as the
PV voltage is too
high.
Check the open-circuit voltages of the
strings and make sure it is below the
maximum DC input voltage of the
inverter. If the input voltage lies within
the permissible range while the fault
occurs, please contact the service.
6
Surface
insulation
resistance
error
In the process of
power on and start-
up, the insulation
impedance of PV +
and PV - to ground
is detected. When
the detection
insulation
impedance is less
than 200kohm, it is
judged as insulation
fault.
1. If it happens occasionally, it may be
caused by rainy or humid environment.
After the fault is eliminated, the inverter
can resume normal operation without
other actions.
2. If there is continuous alarm, please
check the PV array’s insulation to ground
and make sure that the insulation
resistance to ground is greater than
200KΩ. Otherwise, visual inspection of all
PV cables and modules. Make sure the
grounding connection of the inverter is
reliable.
If all above are normal, please contact the
service.
7
Ground fault
circuit
interrupter
(GFCI)
exceeds the
permissible
range
residual current
over the
permission range
1. Make sure the grounding connection
of the inverter is reliable.
2. Make a visual inspection of all PV
cables and modules.
3. If this fault is still shown, contact the
service.
8
Inverter
temperature
too high
Heat sink and
internal
environment
temperature
higher than 85
degree
Please confirm:
1. Whether the airflow to the heat
sink is obstructed.
2. Whether the installation site is in
direct sunlight and ambient
3. temperature around the inverter
is too high.
If all above is normal, contact the service.
25
24
V.
2
V.
2
9
Utility grid
disconnected
inverter
detected grid
voltage failed
1.
2.
If it happens occasionally, it belongs
to the short-time abnormality of the
power grid, the inverter will return to
normal operation after detecting that
the power grid is normal, and there is
no need to deal with it.
If it cannot be recovered for a long
time, please confirm:
whether the AC circuit breaker is
disconnected
whether the AC terminal or fuse is in
good contact
whether the power supply line is normal
If this fault is still being shown, contact
the service.
10
Grid voltage
exceeds the
permissible
range
grid voltage
exceeds the Safety
regulations
1. If it happens occasionally, it belongs to
the short-time abnormality of the
power grid, the inverter will return to
normal operation after detecting the
normal power grid, and there is no
need to deal with it.
2. In case of frequent occurrence but
automatic recovery, please confirm if
the grid voltage is outside the
permissible range due to local grid
conditions, try to modify the values of
the monitored operational limits after
informing the electric utility company
first.
3. If it cannot be recovered for a long
time, please confirm:
· whether the AC circuit breaker is
disconnected
·
·
·
whether the AC terminal is in good
connection
whether the power supply line is normal
whether the AC cable wiring (such as wire
length and wire diameter) complies with
the user manual guidance
whether the safety regulation settings are
normal
11
Grid
frequency
exceeds the
permissible
range
grid frequency
exceeds the safety
regulations
1. If it happens occasionally, it
belongs to the short-time
abnormality of the power grid, the inverter
will return to normal operation after
detecting the normal power grid, and
there is no need to deal with it.
2. In case of frequent occurrence but
automatic recovery, please confirm if the
grid voltage is outside the permissible
range due to local grid conditions, try to
modify the values of the monitored
operational limits after informing the
electric utility company first.
·
