- 158 -
000570BG
8 - Maintenance
- Error code
- Error message
- Warning
Name of Alarm and Cause
Solution
- E025*
- Riso Low
-
Yellow LED
*not visualised on
display
Low value of insulation resistance:
Before connecting to the grid the inverter measures the
insulation resistance of the PV generator compared
to ground. Should the measurement of the insulation
resistance be below 1Mohm, 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
insulation resistance using a megohmmeter
positioned in the photovoltaic field (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.
- E026
- Vref 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
- Error Meas V
-
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
- Error Meas F
-
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
- Error Meas Ileak
-
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
- Error Read V
-
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.
- E032
- Error Read I
-
Yellow LED
Imbalanced output currents:
Measurement of the unbalance in the output voltage
(made across the three phases) outside of range (only
in three-phase 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.
- E033
- UTH
-
Yellow LED
Low ambient temperature:
Temperature outside the inverter below -25°C
• Wait for the temperatures to which the inverter is exposed to
return to the operating range.
- If the problem persists, contact customer assistance. You
must remember to wait for the time necessary to allow the
inverter to warm up.
- E034
- Interlock fail
-
Yellow LED
“IGBT” circuitry not ready:
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.
- E035*
- Remote Off
-
Yellow LED
*not visualised on
display
Inverter awaiting “remote ON” command:
The inverter has been switched off remotely (remote
OFF) and remains in waiting state for the signal that
will switch it on again (remote ON).
• Switch the inverter back on remotely. If the unit does not
switch on, disable the remote on/off function and switch the
equipment off completely and then switch it on again.
- If the problem persists (once the Remote ON/OFF function
has been reactivated), contact customer assistance.
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