ABB UNO-DM-3.3-TL-PLUS Product Manual page 165

- Code on display
- Error message Name of Alarm and Cause
- Signal
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 con-
nect to the grid and shows the "Riso Low" error. The
- E025*
causes may be:
- Riso Low
- PV panel(s) damaged;
- Alarm LED
- Junction box(es) of the panels not correctly sealed, so
as to permit infiltration by water and/or humidity;
*not visualised on dis-
- Problems in connections between panels (not per-
play
fectly fit);
- Poor quality of cable joints;
- Presence in the DC section of unsuitable or damaged
overvoltage surge arresters outside the inverter (re-
duced ignition voltage compared to the characteristics
of the strings of the PV generator);
- Presence of humidity inside any junction box
- E026 Internal reference voltage outside of range:
- Vref Error Wrong measurement of reference voltage inside in-
- Alarm LED verter
Grid voltage outside of range:
- E027 Error in the internal measurement of grid voltage (set
- Error Meas V
by law) in order to have a redundant measurement (2
- Alarm LED measurements on the same parameter made by two
different circuits)
Grid frequency outside of range:
- E028 Error in the internal measurement of grid frequency
- Error Meas F
(set by law) in order to have a redundant measurement
-
Alarm LED (2 measurements on the same parameter made by two
different circuits)
- E029 Internal overvoltage on the measurement of the
- Mid Bulk OV "Mid bulk":
-
Alarm LED Error inside the inverter (only triphase models)
High leakage current (DC side):
Error in the internal measurement (made when the
- E030 inverter is grid connected) of the leakage current of
- Error Meas Ileak the DC side (PV generator) compared to ground (set
- Alarm LED by law) in order to have a redundant measurement (2
measurements on the same parameter made by two
different circuits)
Output relay damaged:
- E031 Measurement of internal voltage on heads of the out-
- Error Read V put relay outside of range. There is too great a differ-
-
Alarm LED ence in voltage between the input and output of the grid
connection relay.
Imbalanced output currents:
- E032
Measurement of the imbalance in the output voltage
- Error Read I
(carried out across the three phases) outside of range
- Alarm LED
(only in triphase models)
- E033
Low ambient temperature:
- UTH
Temperature outside the inverter below -25°C
- Alarm LED
- E034
"IGBT" circuitry not ready:
- Interlock fail
Error inside the inverter
- Alarm LED
- E035*
Inverter awaiting "remote ON" command:
- Remote Off
The inverter has been switched off remotely (remote
- Alarm LED
OFF) and remains awaiting the signal which will switch
*not visualised on dis-
it back on (Remote ON)
play
Solution
• Measure the insulation resistance using a megohmmeter posi-
tioned 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 gen-
erator to identify and eliminate the problem.
- If the value measured is higher than 1 megaohm and the error
signal persists, contact customer assistance.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• Wait for the temperatures to which the inverter is exposed to
return to the operating range.
- If the problem persists, contact customer assistance. Remem-
ber to wait the time needed to allow the inverter to warm up
• 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.
• Switch the inverter back on remotely. If the unit does not
switch back on, disable the remote off/on function and switch
the equipment off completely and subsequently switch it back
on.
- If the problem persists (once the Remote ON/OFF function
from the display has been reactivated), contact customer as-
sistance.
- 165 -
8 - Maintenance