ABB UNO-DM-3.3-TL-PLUS Product Manual page 164

- Code on display
- Error message Name of Alarm and Cause
- Signal
High leakage current measured on the DC side
(photovoltaic generator):
The alarm is generated when, during normal operation
- E018
of the inverter, a leakage current to ground is detected
- Ground Fault in the DC section of the system. It is also possible that
- GFI LED the inverter generates the alarm E018 message also
due to AC leakage currents connected to the capaci-
tive nature of the photovoltaic generator compared to
ground.
Failure of test on sensor to measure the leakage
current (DC side):
Before connecting to the grid the inverter runs a au-
totest regarding the sensor for the leakage current. The
- E019
test is carried out by "forcing", in the sensor of the leak-
- Ileak sense.fail
age current, a current with a known value: the micropro-
- Alarm LED
cessor compares the value read with the known value.
The error is generated if the comparison between the
read value and the known value during the test does
not fall within the allowed tolerance.
Failure of the test on the relay of the "Booster"
(DC-DC circuit):
Before connecting to the grid the inverter carries out in-
- E020
ternal tests. One of these tests concerns the correct op-
- Self Test Error 1
eration of the booster relay. The test is carried out by "forc-
- Alarm LED
ing" the switching of the relay and checking its operation.
The error is generated if a problem is found in action-
ing the relay.
Failure of the test on the inverter's relay (DC-AC
circuit):
Before connecting to the grid the inverter carries out in-
- E021
ternal tests. One of these tests concerns the correct op-
- Self Test Error 2
eration of the inverter relay. The test is carried out by "forc-
- Alarm LED
ing" the switching of the relay and checking its operation.
The error is generated if a problem is found in action-
ing the relay.
Timeout of the tests undertaken on the relays in-
- E022 side the inverter:
- Self Test Error 4 Execution time for the autotest carried out on the relay
- Alarm LED of the DC_AC (inverter) circuit too high. It may indicate
a problem connected to the aforementioned relays
Feeding of direct current to grid outside of range:
The error is generated if the continuous component of
the current supplied to the grid exceeds the threshold
of 0.5% of the normal operating current.
- E023
In any case the inverter is not blocked due to the E023
- DC in error
error, but tries to reconnect to the grid.
- Alarm LED
The sporadic repetition of the error is a sign of seri-
ous grid distortions or sharp irradiation changes, while
systematic repetition of the error signal will indicate a
breakdown on the inverter
- E024
Error inside the inverter:
- Internal error
Error inside the inverter
- Alarm LED
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.
By its nature, the alarm only occurs prior to connection to the
grid
- If the problem (once the inverter has been switched off and
back on) persists, contact customer assistance.
• Error inside the inverter and cannot be checked externally.
By its nature, the alarm only occurs prior to connection to the
grid
- 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.
By its nature, the alarm only occurs prior to connection to the
grid
- 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.
Once the error occurs, the inverter tries to return to normal op-
eration.
- 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 breakdown, it will con-
tinue to appear and so it is necessary to contact customer as-
sistance.
• 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.
- 164 -
8 - Maintenance