ABB UNO-DM-2.0-TL-PLUS Manual page 181

- Code on display
- Error message Name of Alarm and Cause
- Signal
Inverter fault / Incomplete inverter closing:
E081 Fault inside the inverter or incomplete inverter clos-
- Internal Error ing (front cover missing or not tightened, cable glands
-
GFI LED missing or incorrectly tightened, environmental protec-
tion IP65 not guaranteed)
Return current to photovoltaic field:
E084 The error occurs if the input voltage is particularly low
- BackFeed OC (typically in the evening in conditions of low irradiation)
- Alarm LED and indicates a return current from the inverter to the
photovoltaic panels).
E089 Incorrect grid wiring connection on Stand Alone:
- Wrong Wiring The error occurs if the grid cables have been incor-
-
Alarm LED rectly connected to the Stand Alone output.
Solution
• If the problem has occurred during the installation phase or
during the inverter maintenance phase (therefore the cover
has been removed or the cable glands have been acted upon),
carry out the following operations:
- Disconnect the AC grid and DC input from the inverter and
check for the front cover and all the cable glands, also check-
ing their correct tightening to ensure environmental protection
IP65; reconnect the AC grid and the DC input and attempt to
switch the inverter on; if the problem persists, contact customer
assistance :
- If the front cover and all cable glands are present, discon-
nect the AC grid and DC input from the inverter and wait 15
minutes at a safe distance, then open the inverter cover and
if no smoke/smell of burning is present, check the integrity of
the components or the presence of moisture or other abnormal
conditions; reconnect the AC grid and DC input and attempt to
switch on the inverter; if the problem persists contact customer
assistance.
• If the problem has occurred after installation or after an in-
verter maintenance phase (therefore the cover has NOT been
removed or the cable glands have NOT been acted upon), dis-
connect the AC grid and the DC input from the inverter and
contact customer assistance.
If the error occurs in the evening or in conditions of low irra-
diation, it must not be considered a problem but a protection
intervention for the photovoltaic field.
- If the problem occurs with good irradiation conditions, switch
the inverter off and back on again; if the error persists, contact
customer assistance.
• Check that the cables on the Stand Alone output have been
installed correctly.
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8 - Maintenance