EN
122
8.10.2 Alarm Messages of the Inverter
In order to understand and resolve warning (Wxxx) or error (Exxx) signals that appear in the
or
sections of the Web User Interface follow the table given in the following paragraph.
The equipment can notify errors/warnings in the Event or Dashboard sections of the Web User Interface only if the input voltage is greater
than the Vdcmin voltage (POWER Led flashing or lit; refer to
paragraph).
NOTE –
D
The following table gives the complete list of errors/warnings relating to string inverters. Some error/warning codes may
not be used depending on the inverter model installed.
- Error code
- Error message
- LED status
Name of Alarm and Cause
Solution
- No code
- Ground F
- Red LED
Ground fault of photovoltaic generator:
The alarm is generated when a leakage
current to ground is detected in the DC
section of the system.
• Measure the isolation resistance using a megohmmeter
positioned in the photovoltaic array (positive terminal short-
circuited at the negative pole) compared to ground. The
measurement is strongly influenced by the environmental
conditions, so must be made under the same conditions in
which the error occurred.
- If the value measured is lower than 1 megaohm, a check
must be carried out by a technician/installer on the photovoltaic
generator to identify and eliminate the problem.
- If the value measured is higher than 1 megaohm and the error
signal persists, contact customer assistance.
- No code
- Missing Grid
- Flashing green LED
- Yellow LED
Missing Grid:
The inverter does not detect grid voltage
(AC side).
• Check the grid voltage on the inverter's AC terminal block.
- Should it be absent, check any protection work on the line and
the presence of grid voltage on the supply point.
- No code
- Memory fault
- Flashing yellow LED
Memory fault:
The inverter has detected a
communication problem with the memory
board on which the inverter saves the daily
value of energy produced.
• Remove the memory board and check the welding of all the
connector's terminals. Subsequently reinsert the memory
board and check that it is correctly inserted into the dedicated
slot
- If the signal persists also following the above checks, contact
customer assistance.
- No code
- Waiting Sun
- Flashing green LED
Waiting Sun:
The inverter goes into the “Waiting Sun”
stage when, following a W001 and/
or W002 warning, the voltage from the
photovoltaic generator is less than the
activation voltage (Vstart).
• Check the input voltage on the inverter.
- If it does not exceed Vstart, check for the presence of
sufficient irradiation and the correct composition of the system.
- If it exceeds Vstart, contact customer assistance
- W001
- Sun Low
- Yellow LED
Insufficient irradiation (Low input voltage
on switching on the inverter):
Incorrect configuration of the PV generator
or an “on the limit” configuration for the
inverter's minimum input voltage.
• Check the input voltage on the inverter.
- If it does not exceed Vstart, check for the presence of
sufficient irradiation and the correct composition of the system.
- If it exceeds Vstart, contact customer assistance
- W002
- Input UV
- Yellow LED
Insufficient irradiation (Low input voltage
on switching off):
Incorrect configuration of the photovoltaic
generator or an “on the limit” configuration
for the inverter's minimum input voltage.
• Check the input voltage on the inverter.
- If it does not exceed Vstart, check for the presence of
sufficient irradiation and the correct composition of the system.
- If it exceeds Vstart, contact customer assistance
- W003
- Grid Fail
- Yellow LED
Parameters of grid voltage outside range:
This error signal occurs when during
the inverter's normal operation the grid
parameters exceed the limits set by the
operator:
- Grid voltage absent (after the signal the
inverter goes to "Missing Grid")
- Unstable grid voltage (values too low or
too high)
- Unstable grid frequency
• Check the grid voltage on the inverter.
- Should it be absent, check for absence of grid voltage on the
supply point.
- If, on the other hand, the voltage tends to rise (when the
inverter is connected) there is high line or grid impedance.
• Check the grid voltage also on the supply.
- If it is high, it means that there is high grid impedance. In this
case, ask the operator to adjust the grid voltage. If the operator
authorises a change to the inverter's parameters, agree the
new limits with customer assistance
- If the voltage at the point of supply is much lower than that
measured on the inverter, it is necessary to adjust the line
(inverter-contactor).
- If the voltage and the grid frequency come back within the
limits (also when the inverter is connected to the grid), contact
customer assistance
