161Maintenance
EN
- Error code
- Error message
- LED status
Name of Alarm and Cause Solution
- E023
- DC injection
- Yellow LED
Feeding of direct current to grid outside of range:
The error is generated if the direct component of the
current supplied to the grid exceeds the threshold of
0.5% of the rated operating current.
In any case, the inverter does not stop because of
the E023 error, but tries to connect to the grid again.
The sporadic repetition of the error is a sign of
serious grid distortions or sharp irradiation
changes, while systematic repetition of the error
signal will indicate a breakdown on the inverter
Once the error appears, the inverter attempts to
resume normal operation.
- Should the error occur sporadically, it may be
caused by a brusque transition of the grid voltage
or of the input voltage, but is not due to a
malfunction by the inverter.
- If the error is connected to an internal fault, it will
continue to appear and so it is necessary to
contact customer assistance.
- E024
- Internal error
- Yellow LED
Error inside the inverter:
Error inside the inverter
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
- E025
- Riso Low
- Red LED
Low value of isolation resistance:
Before connecting to the grid the inverter measures
the isolation resistance of the PV generator
compared to ground. Should the measurement of
the isolation resistance be below 75kOhm, the
inverter does not connect to the grid and shows the
“Riso Low” error. The causes may be:
- Damaged PV panel(s).
- Junction box(es) of the panels not correctly sealed,
so as to permit infiltration by water and/or humidity;
- Problems in connections between panels (not
perfectly fit);
- Poor quality of cable joints;
- Presence in the DC section of unsuitable or
damaged overvoltage surge arresters outside the
inverter (reduced ignition voltage compared to the
characteristics of the strings of the PV generator);
- Presence of humidity inside any junction box
• 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 75kOhm, 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 75kOhm and
the error signal persists, contact customer
assistance.
- E026
- Internal error
- Yellow LED
Internal reference voltage outside of range:
Wrong measurement of reference voltage inside
inverter
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
- E027
- Internal error
- Yellow LED
Grid voltage outside of range:
Error in the internal measurement of grid voltage
(set by law) to have a redundant measurement (2
measurements on the same parameter made by two
different circuits)
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
- E028
- Internal error
- Yellow LED
Grid frequency outside of range:
Error in the internal measurement of the grid
frequency (imposed by regulations) to have a
measurement redundancy (2 measurements on the
same parameter carried out by two different
circuits).
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
- E029
- Mid Bulk OV
- Yellow LED
Internal overvoltage on the measurement of the “Mid
bulk”:
Error inside the inverter (only triphase models)
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
- E030
- Internal error
- Yellow LED
High leakage current (DC side):
- Error on the internal measurement (performed
when the inverter is connected to the grid) of the DC
side (PV generator) leakage current with respect to
ground (required by regulations) to have a
measurement redundancy (2 measurements of the
same parameter carried out by two independent
circuits)
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
- E031
- Internal error
- Yellow LED
Output relay damaged:
Measurement of internal voltage on heads of the
output relay outside of range. There is too great a
difference in voltage between the input and output
of the grid connection relay.
• Error inside the inverter and cannot be checked
externally.
- If the problem persists (once the inverter has
been switched off and back on again), contact
customer assistance.
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